Fixe orphan process commection by init

- `pupulates` => `populates`

Makefile

@@ -0,0 +1,14 @@
+ZSH := $(shell command -v zsh 2> /dev/null)
+
+all:
+
+zwc:
+	$(MAKE) -C gitstatus zwc
+	$(or $(ZSH),:) -fc 'for f in *.zsh-theme internal/*.zsh; do zcompile -R -- $$f.zwc $$f || exit; done'
+
+minify:
+	$(MAKE) -C gitstatus minify
+	rm -rf -- .git .gitattributes .gitignore LICENSE Makefile README.md font.md powerlevel10k.png
+
+pkg: zwc
+	$(MAKE) -C gitstatus pkg

config/p10k-pure.zsh

@@ -23,13 +23,13 @@
 'builtin' 'setopt' 'no_aliases' 'no_sh_glob' 'brace_expand'
 
 () {
-  emulate -L zsh
-  setopt no_unset
-
-  autoload -Uz is-at-least && is-at-least 5.1 || return
+  emulate -L zsh -o extended_glob
 
   # Unset all configuration options.
-  unset -m 'POWERLEVEL9K_*'
+  unset -m '(POWERLEVEL9K_*|DEFAULT_USER)~POWERLEVEL9K_GITSTATUS_DIR'
+
+  # Zsh >= 5.1 is required.
+  [[ $ZSH_VERSION == (5.<1->*|<6->.*) ]] || return
 
   # Prompt colors.
   local grey=242
@@ -169,7 +169,7 @@
   #              it incompatible with your zsh configuration files.
   #   - quiet:   Enable instant prompt and don't print warnings when detecting console output
   #              during zsh initialization. Choose this if you've read and understood
-  #              https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt.
+  #              https://github.com/romkatv/powerlevel10k#instant-prompt.
   #   - verbose: Enable instant prompt and print a warning when detecting console output during
   #              zsh initialization. Choose this if you've never tried instant prompt, haven't
   #              seen the warning, or if you are unsure what this all means.
@@ -186,5 +186,8 @@
   (( ! $+functions[p10k] )) || p10k reload
 }
 
+# Tell `p10k configure` which file it should overwrite.
+typeset -g POWERLEVEL9K_CONFIG_FILE=${${(%):-%x}:a}
+
 (( ${#p10k_config_opts} )) && setopt ${p10k_config_opts[@]}
 'builtin' 'unset' 'p10k_config_opts'

config/p10k-robbyrussell.zsh

@@ -18,12 +18,13 @@
 'builtin' 'setopt' 'no_aliases' 'no_sh_glob' 'brace_expand'
 
 () {
-  emulate -L zsh
-
-  autoload -Uz is-at-least && is-at-least 5.1 || return
+  emulate -L zsh -o extended_glob
 
   # Unset all configuration options.
-  unset -m 'POWERLEVEL9K_*'
+  unset -m '(POWERLEVEL9K_*|DEFAULT_USER)~POWERLEVEL9K_GITSTATUS_DIR'
+
+  # Zsh >= 5.1 is required.
+  [[ $ZSH_VERSION == (5.<1->*|<6->.*) ]] || return
 
   # Left prompt segments.
   typeset -g POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(prompt_char dir vcs)
@@ -86,7 +87,7 @@
   #              it incompatible with your zsh configuration files.
   #   - quiet:   Enable instant prompt and don't print warnings when detecting console output
   #              during zsh initialization. Choose this if you've read and understood
-  #              https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt.
+  #              https://github.com/romkatv/powerlevel10k#instant-prompt.
   #   - verbose: Enable instant prompt and print a warning when detecting console output during
   #              zsh initialization. Choose this if you've never tried instant prompt, haven't
   #              seen the warning, or if you are unsure what this all means.
@@ -103,5 +104,8 @@
   (( ! $+functions[p10k] )) || p10k reload
 }
 
+# Tell `p10k configure` which file it should overwrite.
+typeset -g POWERLEVEL9K_CONFIG_FILE=${${(%):-%x}:a}
+
 (( ${#p10k_config_opts} )) && setopt ${p10k_config_opts[@]}
 'builtin' 'unset' 'p10k_config_opts'

font.md

@@ -0,0 +1,180 @@
+# Recommended font: Meslo Nerd Font patched for Powerlevel10k
+
+Gorgeous monospace font designed by Jim Lyles for Bitstream, customized by the same for Apple,
+further customized by André Berg, and finally patched by yours truly with customized scripts
+originally developed by Ryan L McIntyre of Nerd Fonts. Contains all glyphs and symbols that
+Powerlevel10k may need. Battle-tested in dozens of different terminals on all major operating
+systems.
+
+*FAQ*: [How was the recommended font created?](README.md#how-was-the-recommended-font-created)
+
+## Automatic font installation
+
+If you are using iTerm2 or Termux, `p10k configure` can install the recommended font for you.
+Simply answer `Yes` when asked whether to install *Meslo Nerd Font*.
+
+If you are using a different terminal, proceed with manual font installation. 👇
+
+## Manual font installation
+
+1. Download these four ttf files:
+   - [MesloLGS NF Regular.ttf](
+       https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Regular.ttf)
+   - [MesloLGS NF Bold.ttf](
+       https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Bold.ttf)
+   - [MesloLGS NF Italic.ttf](
+       https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Italic.ttf)
+   - [MesloLGS NF Bold Italic.ttf](
+       https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Bold%20Italic.ttf)
+1. Double-click on each file and click "Install". This will make `MesloLGS NF` font available to all
+   applications on your system.
+1. Configure your terminal to use this font:
+   - **iTerm2**: Type `p10k configure` and answer `Yes` when asked whether to install
+     *Meslo Nerd Font*. Alternatively, open *iTerm2 → Preferences → Profiles → Text* and set *Font* to
+     `MesloLGS NF`.
+   - **Apple Terminal**: Open *Terminal → Preferences → Profiles → Text*, click *Change* under *Font*
+     and select `MesloLGS NF` family.
+   - **Hyper**: Open *Hyper → Edit → Preferences* and change the value of `fontFamily` under
+     `module.exports.config` to `MesloLGS NF`.
+   - **Visual Studio Code**: Open *File → Preferences → Settings* (PC) or
+     *Code → Preferences → Settings* (Mac), enter `terminal.integrated.fontFamily` in the search box at
+     the top of *Settings* tab and set the value below to `MesloLGS NF`.
+     Consult [this screenshot](
+       https://raw.githubusercontent.com/romkatv/powerlevel10k-media/389133fb8c9a2347929a23702ce3039aacc46c3d/visual-studio-code-font-settings.jpg)
+     to see how it should look like or see [this issue](
+       https://github.com/romkatv/powerlevel10k/issues/671) for extra information.
+   - **GNOME Terminal** (the default Ubuntu terminal): Open *Terminal → Preferences* and click on the
+     selected profile under *Profiles*. Check *Custom font* under *Text Appearance* and select
+     `MesloLGS NF Regular`.
+   - **Konsole**: Open *Settings → Edit Current Profile → Appearance*, click *Select Font* and select
+     `MesloLGS NF Regular`.
+   - **Tilix**: Open *Tilix → Preferences* and click on the selected profile under *Profiles*. Check
+     *Custom font* under *Text Appearance* and select `MesloLGS NF Regular`.
+   - **Windows Console Host** (the old thing): Click the icon in the top left corner, then
+     *Properties → Font* and set *Font* to `MesloLGS NF`.
+   - **Windows Terminal** by Microsoft (the new thing): Open *Settings* (<kbd>Ctrl+,</kbd>), click
+     either on the selected profile under *Profiles* or on *Defaults*, click *Appearance* and set
+     *Font face* to `MesloLGS NF`.
+   - **Conemu**: Open *Setup → General → Fonts* and set *Main console font* to `MesloLGS NF`.
+   - **IntelliJ** (and other IDEs by Jet Brains): Open *IDE → Edit → Preferences → Editor →
+     Color Scheme → Console Font*. Select *Use console font instead of the default* and set the font
+     name to `MesloLGS NF`.
+   - **Termux**: Type `p10k configure` and answer `Yes` when asked whether to install
+     *Meslo Nerd Font*.
+   - **Blink**: Type `config`, go to *Appearance*, tap *Add a new font*, tap *Open Gallery*, select
+     *MesloLGS NF.css*, tap *import* and type `exit` in the home view to reload the font.
+   - **Tabby** (formerly **Terminus**): Open *Settings → Appearance* and set *Font* to `MesloLGS NF`.
+   - **Terminator**: Open *Preferences* using the context menu. Under *Profiles* select the *General*
+     tab (should be selected already), uncheck *Use the system fixed width font* (if not already)
+     and select `MesloLGS NF Regular`. Exit the Preferences dialog by clicking *Close*.
+   - **Guake**: Right Click on an open terminal and open *Preferences*. Under *Appearance*
+     tab, uncheck *Use the system fixed width font* (if not already) and select `MesloLGS NF Regular`.
+     Exit the Preferences dialog by clicking *Close*.
+   - **MobaXterm**: Open *Settings* → *Configuration* → *Terminal* → (under *Terminal look and feel*)
+     and change *Font* to `MesloLGS NF`. If you have *sessions*, you need to change the font in each
+     of them through *Settings* → right click on an individual session → *Edit Session* → *Terminal
+     Settings* → *Font settings*.
+   - **Asbrú Connection Manager**: Open *Preferences → Local Shell Options → Look and Feel*, enable
+     *Use these personal options* and change *Font:* under *Terminal UI* to `MesloLGS NF Regular`.
+     To change the font for the remote host connections, go to *Preferences → Terminal Options →
+     Look and Feel* and change *Font:* under *Terminal UI* to `MesloLGS NF Regular`.
+   - **Warp**: Open Warp and Navigate to *Settings* then *Appearance*.  Scroll down to *Text* Section
+     and under *"Terminal Font"*, select the `MesloLGS NF` font.
+   - **WSLtty**: Right click on an open terminal and then on *Options*. In the *Text* section, under
+     *Font*, click *"Select..."* and set Font to `MesloLGS NF Regular`.
+   - **Yakuake**: Click *≡* → *Manage Profiles* → *New* → *Appearance*. Click *Choose* next to the
+     *Font* dropdown, select `MesloLGS NF` and click *OK*. Click *OK* to save the profile. Select the
+     new profile and click *Set as Default*.
+   - **Alacritty**: Create or open `~/.config/alacritty/alacritty.toml` and add the following
+     section to it:
+     ```toml
+     [font.normal]
+     family = "MesloLGS NF"
+     ```
+   - **foot**: Create or open `~/.config/foot/foot.ini` and add the following section to it:
+     ```ini
+     font=MesloLGS NF:size=12
+     ```
+   - **kitty**: Create or open `~/.config/kitty/kitty.conf` and add the following line to it:
+     ```text
+     font_family MesloLGS NF
+     ```
+     Restart kitty by closing all sessions and opening a new session.
+   - **puTTY**: Set *Window* → *Appearance* → *Font* to `MesloLGS NF`. Requires puTTY
+     version >= 0.75.
+   - **WezTerm**: Create or open `$HOME/.config/wezterm/wezterm.lua` and add the following:
+     ```lua
+     local wezterm = require 'wezterm';
+     return {
+         font = wezterm.font("MesloLGS NF"),
+     }
+     ```
+     If the file already exists, only add the line with the font to the existing return.
+     Also add the first line if it is not already present.
+   - **urxvt**: Create or open `~/.Xresources` and add the following line to it:
+     ```text
+     URxvt.font: xft:MesloLGS NF:size=11
+     ```
+     You can adjust the font size to your preference. After changing the config run
+     `xrdb ~/.Xresources` to reload it. The new config is applied to all new terminals.
+   - **xterm**: Create or open `~/.Xresources` and add the following line to it:
+     ```text
+     xterm*faceName: MesloLGS NF
+     ```
+     After changing the config run `xrdb ~/.Xresources` to reload it. The new config is applied to
+     all new terminals.
+   - **Zed**: Open `~/.config/zed/settings.json` and set `terminal.font_family` to `"MesloLGS NF"`.
+     ```jsonc
+     {
+       "terminal": {
+         "font_family": "MesloLGS NF"
+       },
+       // Other settings.
+     }
+     ```
+   - Crostini (Linux on Chrome OS): Open
+     chrome-untrusted://terminal/html/nassh_preferences_editor.html, set *Text font family* to
+      `'MesloLGS NF'` (including the quotes) and *Custom CSS (inline text)* to the following:
+     ```css
+     @font-face {
+      font-family: "MesloLGS NF";
+      src: url("https://raw.githubusercontent.com/romkatv/powerlevel10k-media/master/MesloLGS%20NF%20Regular.ttf");
+      font-weight: normal;
+      font-style: normal;
+     }
+     @font-face {
+         font-family: "MesloLGS NF";
+         src: url("https://raw.githubusercontent.com/romkatv/powerlevel10k-media/master/MesloLGS%20NF%20Bold.ttf");
+         font-weight: bold;
+         font-style: normal;
+     }
+     @font-face {
+         font-family: "MesloLGS NF";
+         src: url("https://raw.githubusercontent.com/romkatv/powerlevel10k-media/master/MesloLGS%20NF%20Italic.ttf");
+         font-weight: normal;
+         font-style: italic;
+     }
+     @font-face {
+         font-family: "MesloLGS NF";
+         src: url("https://raw.githubusercontent.com/romkatv/powerlevel10k-media/master/MesloLGS%20NF%20Bold%20Italic.ttf");
+         font-weight: bold;
+         font-style: italic;
+     }
+     ```
+     **_CAVEAT_**: If you open the normal terminal preferences these settings will be overwritten.
+   - **Deepin Terminal**: Create or open `~/.config/deepin/deepin-terminal/config.conf` and add the following section
+     to it:
+     ```ini
+     [basic.interface.font]
+     value = "MesloLGS NF"
+     ```
+   - **Ghostty**: Open *Menu → Open Configuration* (Linux) or *Ghostty → Settings...* (Mac) and add
+     the following line:
+     ```text
+     font-family = "MesloLGS NF"
+     ```
+1. Run `p10k configure` to generate a new `~/.p10k.zsh`. The old config may work
+   incorrectly with the new font.
+
+_Using a different terminal and know how to set the font for it? Share your knowledge by sending a
+PR to expand the list!_

gitstatus/.clang-format

@@ -0,0 +1,4 @@
+BasedOnStyle: Google
+ColumnLimit: 100
+DerivePointerAlignment: false
+PointerAlignment: Left

gitstatus/.gitattributes

@@ -0,0 +1,16 @@
+* text=auto
+
+*.cc   text eol=lf
+*.h    text eol=lf
+*.info text eol=lf
+*.json text eol=lf
+*.md   text eol=lf
+*.sh   text eol=lf
+*.zsh  text eol=lf
+
+/.clang-format text eol=lf
+/LICENSE       text eol=lf
+/Makefile      text eol=lf
+/build         text eol=lf
+/install       text eol=lf
+/mbuild        text eol=lf

gitstatus/.gitignore

@@ -0,0 +1,8 @@
+*.zwc
+/core
+/deps/libgit2-*.tar.gz
+/locks
+/logs
+/obj
+/usrbin/gitstatusd*
+/.vscode/ipch

gitstatus/.vscode/c_cpp_properties.json

@@ -0,0 +1,17 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/src"
+            ],
+            "defines": [
+            ],
+            "compilerPath": "/usr/bin/g++",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "gcc-x64"
+        }
+    ],
+    "version": 4
+}

gitstatus/.vscode/settings.json

@@ -0,0 +1,72 @@
+{
+  "files.exclude": {
+    "*.zwc": true,
+    "core": true,
+    "locks/": true,
+    "logs/": true,
+    "obj/": true,
+    "usrbin/": true,
+  },
+  "files.associations": {
+    "array": "cpp",
+    "atomic": "cpp",
+    "*.tcc": "cpp",
+    "cctype": "cpp",
+    "chrono": "cpp",
+    "clocale": "cpp",
+    "cmath": "cpp",
+    "complex": "cpp",
+    "condition_variable": "cpp",
+    "cstddef": "cpp",
+    "cstdint": "cpp",
+    "cstdio": "cpp",
+    "cstdlib": "cpp",
+    "cstring": "cpp",
+    "ctime": "cpp",
+    "cwchar": "cpp",
+    "cwctype": "cpp",
+    "deque": "cpp",
+    "unordered_map": "cpp",
+    "unordered_set": "cpp",
+    "vector": "cpp",
+    "exception": "cpp",
+    "fstream": "cpp",
+    "functional": "cpp",
+    "future": "cpp",
+    "initializer_list": "cpp",
+    "iomanip": "cpp",
+    "iosfwd": "cpp",
+    "iostream": "cpp",
+    "istream": "cpp",
+    "limits": "cpp",
+    "memory": "cpp",
+    "mutex": "cpp",
+    "new": "cpp",
+    "numeric": "cpp",
+    "optional": "cpp",
+    "ostream": "cpp",
+    "ratio": "cpp",
+    "sstream": "cpp",
+    "stdexcept": "cpp",
+    "streambuf": "cpp",
+    "string_view": "cpp",
+    "system_error": "cpp",
+    "thread": "cpp",
+    "type_traits": "cpp",
+    "tuple": "cpp",
+    "typeinfo": "cpp",
+    "utility": "cpp",
+    "variant": "cpp",
+    "cstdarg": "cpp",
+    "charconv": "cpp",
+    "algorithm": "cpp",
+    "cinttypes": "cpp",
+    "iterator": "cpp",
+    "map": "cpp",
+    "memory_resource": "cpp",
+    "random": "cpp",
+    "string": "cpp",
+    "bit": "cpp",
+    "netfwd": "cpp"
+  }
+}

gitstatus/Makefile

@@ -0,0 +1,57 @@
+APPNAME ?= gitstatusd
+OBJDIR ?= obj
+
+CXX ?= g++
+ZSH := $(shell command -v zsh 2> /dev/null)
+
+VERSION ?= $(shell . ./build.info && printf "%s" "$$gitstatus_version")
+
+# Note: -fsized-deallocation is not used to avoid binary compatibility issues on macOS.
+#
+# Sized delete is implemented as __ZdlPvm in /usr/lib/libc++.1.dylib but this symbol is
+# missing in macOS prior to 10.13.
+CXXFLAGS += -std=c++14 -funsigned-char -O3 -DNDEBUG -DGITSTATUS_VERSION=$(VERSION) # -Wall -g -fsanitize=thread
+LDFLAGS += -pthread # -fsanitize=thread
+LDLIBS += -lgit2 # -lprofiler -lunwind
+
+SRCS := $(shell find src -name "*.cc")
+OBJS := $(patsubst src/%.cc, $(OBJDIR)/%.o, $(SRCS))
+
+all: $(APPNAME)
+
+$(APPNAME): usrbin/$(APPNAME)
+
+usrbin/$(APPNAME): $(OBJS)
+	$(CXX) $(OBJS) $(LDFLAGS) $(LDLIBS) -o $@
+
+$(OBJDIR):
+	mkdir -p -- $(OBJDIR)
+
+$(OBJDIR)/%.o: src/%.cc Makefile build.info | $(OBJDIR)
+	$(CXX) $(CXXFLAGS) -MM -MT $@ src/$*.cc >$(OBJDIR)/$*.dep
+	$(CXX) $(CXXFLAGS) -Wall -c -o $@ src/$*.cc
+
+clean:
+	rm -rf -- $(OBJDIR)
+
+zwc:
+	$(or $(ZSH),:) -fc 'for f in *.zsh install; do zcompile -R -- $$f.zwc $$f || exit; done'
+
+minify:
+	rm -rf -- .clang-format .git .gitattributes .gitignore .vscode deps docs src usrbin/.gitkeep LICENSE Makefile README.md build mbuild
+
+pkg: zwc
+	GITSTATUS_DAEMON= GITSTATUS_CACHE_DIR=$(shell pwd)/usrbin ./install -f
+
+-include $(OBJS:.o=.dep)
+
+.PHONY: help
+
+help:
+	@echo "Usage: make [TARGET]"
+	@echo "Available targets:"
+	@echo "  all         Build $(APPNAME) (default target)"
+	@echo "  clean       Remove generated files and directories"
+	@echo "  zwc         Compile Zsh files"
+	@echo "  minify      Remove unnecessary files and folders"
+	@echo "  pkg         Create a package"

gitstatus/README.md

@@ -1 +1,534 @@
-This is a bundled copy of [gitstatus](https://github.com/romkatv/gitstatus) ZSH plugin.
+# gitstatus
+
+- **THE PROJECT HAS VERY LIMITED SUPPORT**
+- **NO NEW FEATURES ARE IN THE WORKS**
+- **MOST BUGS WILL GO UNFIXED**
+
+**gitstatus** is a 10x faster alternative to `git status` and `git describe`. Its primary use
+case is to enable fast git prompt in interactive shells.
+
+Heavy lifting is done by **gitstatusd** -- a custom binary written in C++. It comes with Zsh and
+Bash bindings for integration with shell.
+
+## Table of Contents
+
+1. [Using from Zsh](#using-from-zsh)
+1. [Using from Bash](#using-from-bash)
+2. [Using from other shells](#using-from-other-shells)
+1. [How it works](#how-it-works)
+1. [Benchmarks](#benchmarks)
+1. [Why fast](#why-fast)
+1. [Requirements](#requirements)
+1. [Compiling](#compiling)
+1. [License](#license)
+
+## Using from Zsh
+
+The easiest way to take advantage of gitstatus from Zsh is to use a theme that's already integrated
+with it. For example, [Powerlevel10k](https://github.com/romkatv/powerlevel10k) is a flexible and
+fast theme with first-class gitstatus integration. If you install Powerlevel10k, you don't need to
+install gitstatus.
+
+![Powerlevel10k Zsh Theme](
+  https://raw.githubusercontent.com/romkatv/powerlevel10k-media/master/prompt-styles-high-contrast.png)
+
+For those who wish to use gitstatus without a theme, there is
+[gitstatus.prompt.zsh](gitstatus.prompt.zsh). Install it as follows:
+
+```zsh
+git clone --depth=1 https://github.com/romkatv/gitstatus.git ~/gitstatus
+echo 'source ~/gitstatus/gitstatus.prompt.zsh' >>! ~/.zshrc
+```
+
+Users in China can use the official mirror on gitee.com for faster download.<br>
+中国大陆用户可以使用 gitee.com 上的官方镜像加速下载.
+
+```zsh
+git clone --depth=1 https://gitee.com/romkatv/gitstatus.git ~/gitstatus
+echo 'source ~/gitstatus/gitstatus.prompt.zsh' >>! ~/.zshrc
+```
+
+Alternatively, if you have Homebrew installed:
+
+```zsh
+brew install romkatv/gitstatus/gitstatus
+echo "source $(brew --prefix)/opt/gitstatus/gitstatus.prompt.zsh" >>! ~/.zshrc
+```
+
+(If you choose this option, replace `~/gitstatus` with `$(brew --prefix)/opt/gitstatus/gitstatus`
+in all code snippets below.)
+
+_Make sure to disable your current theme if you have one._
+
+This will give you a basic yet functional prompt with git status in it. It's
+[over 10x faster](#benchmarks) than any alternative that can give you comparable prompt. In order
+to customize it, set `PROMPT` and/or `RPROMPT` at the end of `~/.zshrc` after sourcing
+`gitstatus.prompt.zsh`. Insert `${GITSTATUS_PROMPT}` where you want git status to go. For example:
+
+```zsh
+source ~/gitstatus/gitstatus.prompt.zsh
+
+PROMPT='%~%# '               # left prompt: directory followed by %/# (normal/root)
+RPROMPT='$GITSTATUS_PROMPT'  # right prompt: git status
+```
+
+The expansion of `${GITSTATUS_PROMPT}` can contain the following bits:
+
+| segment     |  meaning                                              |
+|-------------|-------------------------------------------------------|
+| `master`    | current branch                                        |
+| `#v1`       | HEAD is tagged with `v1`; not shown when on a branch  |
+| `@5fc6fca4` | current commit; not shown when on a branch or tag     |
+| `⇣1`        | local branch is behind the remote by 1 commit         |
+| `⇡2`        | local branch is ahead of the remote by 2 commits      |
+| `⇠3`        | local branch is behind the push remote by 3 commits   |
+| `⇢4`        | local branch is ahead of the push remote by 4 commits |
+| `*5`        | there are 5 stashes                                   |
+| `merge`     | merge is in progress (could be some other action)     |
+| `~6`        | there are 6 merge conflicts                           |
+| `+7`        | there are 7 staged changes                            |
+| `!8`        | there are 8 unstaged changes                          |
+| `?9`        | there are 9 untracked files                           |
+
+`$GITSTATUS_PROMPT_LEN` tells you how long `$GITSTATUS_PROMPT` is when printed to the console.
+[gitstatus.prompt.zsh](gitstatus.prompt.zsh) has an example of using it to truncate the current
+directory.
+
+If you'd like to change the format of git status, or want to have greater control over the
+process of assembling `PROMPT`, you can copy and modify parts of
+[gitstatus.prompt.zsh](gitstatus.prompt.zsh) instead of sourcing the script. Your `~/.zshrc`
+might look something like this:
+
+```zsh
+source ~/gitstatus/gitstatus.plugin.zsh
+
+function my_set_prompt() {
+  PROMPT='%~%# '
+  RPROMPT=''
+
+  if gitstatus_query MY && [[ $VCS_STATUS_RESULT == ok-sync ]]; then
+    RPROMPT=${${VCS_STATUS_LOCAL_BRANCH:-@${VCS_STATUS_COMMIT}}//\%/%%}  # escape %
+    (( VCS_STATUS_NUM_STAGED    )) && RPROMPT+='+'
+    (( VCS_STATUS_NUM_UNSTAGED  )) && RPROMPT+='!'
+    (( VCS_STATUS_NUM_UNTRACKED )) && RPROMPT+='?'
+  fi
+
+  setopt no_prompt_{bang,subst} prompt_percent  # enable/disable correct prompt expansions
+}
+
+gitstatus_stop 'MY' && gitstatus_start -s -1 -u -1 -c -1 -d -1 'MY'
+autoload -Uz add-zsh-hook
+add-zsh-hook precmd my_set_prompt
+```
+
+This snippet is sourcing `gitstatus.plugin.zsh` rather than `gitstatus.prompt.zsh`. The former
+defines low-level bindings that communicate with gitstatusd over pipes. The latter is a simple
+script that uses these bindings to assemble git prompt.
+
+Unlike [Powerlevel10k](https://github.com/romkatv/powerlevel10k), code based on
+[gitstatus.prompt.zsh](gitstatus.prompt.zsh) is communicating with gitstatusd synchronously. This
+can make your prompt slow when working in a large git repository or on a slow machine. To avoid
+this problem, call `gitstatus_query` asynchronously as documented in
+[gitstatus.plugin.zsh](gitstatus.plugin.zsh). This can be quite challenging.
+
+## Using from Bash
+
+The easiest way to take advantage of gitstatus from Bash is via
+[gitstatus.prompt.sh](gitstatus.prompt.sh). Install it as follows:
+
+```bash
+git clone --depth=1 https://github.com/romkatv/gitstatus.git ~/gitstatus
+echo 'source ~/gitstatus/gitstatus.prompt.sh' >> ~/.bashrc
+```
+
+Users in China can use the official mirror on gitee.com for faster download.<br>
+中国大陆用户可以使用 gitee.com 上的官方镜像加速下载.
+
+```bash
+git clone --depth=1 https://gitee.com/romkatv/gitstatus.git ~/gitstatus
+echo 'source ~/gitstatus/gitstatus.prompt.sh' >> ~/.bashrc
+```
+
+Alternatively, if you have Homebrew installed:
+
+```zsh
+brew install romkatv/gitstatus/gitstatus
+echo "source $(brew --prefix)/opt/gitstatus/gitstatus.prompt.sh" >> ~/.bashrc
+```
+
+(If you choose this option, replace `~/gitstatus` with `$(brew --prefix)/opt/gitstatus/gitstatus`
+in all code snippets below.)
+
+This will give you a basic yet functional prompt with git status in it. It's
+[over 10x faster](#benchmarks) than any alternative that can give you comparable prompt.
+
+![Bash Prompt with GitStatus](
+  https://raw.githubusercontent.com/romkatv/gitstatus/1ac366952366d89980b3f3484f270b4fa5ae4293/bash-prompt.png)
+
+In order to customize your prompt, set `PS1` at the end of `~/.bashrc` after sourcing
+`gitstatus.prompt.sh`. Insert `${GITSTATUS_PROMPT}` where you want git status to go. For example:
+
+```bash
+source ~/gitstatus/gitstatus.prompt.sh
+
+PS1='\w ${GITSTATUS_PROMPT}\n\$ ' # directory followed by git status and $/# (normal/root)
+```
+
+The expansion of `${GITSTATUS_PROMPT}` can contain the following bits:
+
+| segment     |  meaning                                              |
+|-------------|-------------------------------------------------------|
+| `master`    | current branch                                        |
+| `#v1`       | HEAD is tagged with `v1`; not shown when on a branch  |
+| `@5fc6fca4` | current commit; not shown when on a branch or tag     |
+| `⇣1`        | local branch is behind the remote by 1 commit         |
+| `⇡2`        | local branch is ahead of the remote by 2 commits      |
+| `⇠3`        | local branch is behind the push remote by 3 commits   |
+| `⇢4`        | local branch is ahead of the push remote by 4 commits |
+| `*5`        | there are 5 stashes                                   |
+| `merge`     | merge is in progress (could be some other action)     |
+| `~6`        | there are 6 merge conflicts                           |
+| `+7`        | there are 7 staged changes                            |
+| `!8`        | there are 8 unstaged changes                          |
+| `?9`        | there are 9 untracked files                           |
+
+If you'd like to change the format of git status, or want to have greater control over the
+process of assembling `PS1`, you can copy and modify parts of
+[gitstatus.prompt.sh](gitstatus.prompt.sh) instead of sourcing the script. Your `~/.bashrc` might
+look something like this:
+
+```bash
+source ~/gitstatus/gitstatus.plugin.sh
+
+function my_set_prompt() {
+  PS1='\w'
+
+  if gitstatus_query && [[ "$VCS_STATUS_RESULT" == ok-sync ]]; then
+    if [[ -n "$VCS_STATUS_LOCAL_BRANCH" ]]; then
+      PS1+=" ${VCS_STATUS_LOCAL_BRANCH//\\/\\\\}"  # escape backslash
+    else
+      PS1+=" @${VCS_STATUS_COMMIT//\\/\\\\}"       # escape backslash
+    fi
+    (( VCS_STATUS_HAS_STAGED"    )) && PS1+='+'
+    (( VCS_STATUS_HAS_UNSTAGED"  )) && PS1+='!'
+    (( VCS_STATUS_HAS_UNTRACKED" )) && PS1+='?'
+  fi
+
+  PS1+='\n\$ '
+
+  shopt -u promptvars  # disable expansion of '$(...)' and the like
+}
+
+gitstatus_stop && gitstatus_start
+PROMPT_COMMAND=my_set_prompt
+```
+
+This snippet is sourcing `gitstatus.plugin.sh` rather than `gitstatus.prompt.sh`. The former
+defines low-level bindings that communicate with gitstatusd over pipes. The latter is a simple
+script that uses these bindings to assemble git prompt.
+
+Note: Bash bindings, unlike Zsh bindings, don't support asynchronous calls.
+
+## Using from other shells
+
+If there are no gitstatusd bindings for your shell, you'll need to get your hands dirty.
+Use the existing bindings for inspiration; run `gitstatusd --help` or read the same thing in
+[options.cc](src/options.cc).
+
+## How it works
+
+gitstatusd reads requests from stdin and prints responses to stdout. Requests contain an ID and
+a directory. Responses contain the same ID and machine-readable git status for the directory.
+gitstatusd keeps some state in memory for the directories it has seen in order to serve future
+requests faster.
+
+[Zsh bindings](gitstatus.plugin.zsh) and [Bash bindings](gitstatus.plugin.sh) start gitstatusd in
+the background and communicate with it via pipes. Themes such as
+[Powerlevel10k](https://github.com/romkatv/powerlevel10k) use these bindings to put git status in
+`PROMPT`.
+
+Note that gitstatus cannot be used as a drop-in replacement for `git status` command as it doesn't
+produce output in the same format. It does perform the same computation though.
+
+## Benchmarks
+
+The following benchmark results were obtained on Intel i9-7900X running Ubuntu 18.04 in
+a clean [chromium](https://github.com/chromium/chromium) repository synced to `9394e49a`. The
+repository was checked out to an ext4 filesystem on M.2 SSD.
+
+Three functionally equivalent tools for computing git status were benchmarked:
+
+* `gitstatusd`
+* `git` with `core.untrackedcache` enabled and `core.fsmonitor` disabled
+* `lg2` -- a demo/example executable from [libgit2](https://github.com/romkatv/libgit2) that
+  implements a subset of `git` functionality on top of libgit2 API; for the purposes of this
+  benchmark the subset is sufficient to generate the same data as the other tools
+
+Every tool was benchmark in cold and hot conditions. For `git` the first run in a repository was
+considered cold, with the following runs considered hot. `lg2` was patched to compute results twice
+in a single invocation without freeing the repository in between; the second run was considered hot.
+The same patching was not done for `git` because `git` cannot be easily modified to refresh inmemory
+index state between invocations; in fact, this limitation is one of the primary reasons developers
+use libgit2. `gitstatusd` was benchmarked similarly to `lg2` with two result computations in the
+same invocation.
+
+Two commands were benchmarked: `status` and `describe`.
+
+### Status
+
+In this benchmark all tools were computing the equivalent of `git status`. Lower numbers are better.
+
+| Tool          |      Cold  |         Hot |
+|---------------|-----------:|------------:|
+| **gitstatus** | **291 ms** | **30.9 ms** |
+| git           |     876 ms |      295 ms |
+| lg2           |    1730 ms |     1310 ms |
+
+gitstatusd is substantially faster than the alternatives, especially on hot runs. Note that hot runs
+are of primary importance to the main use case of gitstatus in interactive shells.
+
+The performance of `git status` fluctuated wildly in this benchmarks for reasons unknown to the
+author. Moreover, performance is sticky -- once `git status` settles around a number, it stays
+there for a long time. Numbers as diverse as 295, 352, 663 and 730 had been observed on hot runs on
+the same repository. The number in the table is the lowest (fastest or best) that `git status` had
+shown.
+
+### Describe
+
+In this benchmark all tools were computing the equivalent of `git describe --tags --exact-match`
+to find tags that resolve to the same commit as `HEAD`. Lower numbers are better.
+
+| Tool          |       Cold  |           Hot |
+|---------------|------------:|--------------:|
+| **gitstatus** | **4.04 ms** | **0.0345 ms** |
+| git           |     18.0 ms |       14.5 ms |
+| lg2           |      185 ms |       45.2 ms |
+
+gitstatusd is once again faster than the alternatives, more so on hot runs.
+
+## Why fast
+
+Since gitstatusd doesn't have to print all staged/unstaged/untracked files but only report
+whether there are any, it can terminate repository scan early. It can also remember which files
+were dirty on the previous run and check them first on the next run to avoid the scan entirely if
+the files are still dirty. However, the benchmarks above were performed in a clean repository where
+these shortcuts do not trigger. All benchmarked tools had to do the same work -- check the status
+of every file in the index to see if it has changed, check every directory for newly created files,
+etc. And yet, gitstatusd came ahead by a large margin. This section describes what it does that
+makes it so fast.
+
+Most of the following comparisons are done against libgit2 rather than git because of the author's
+familiarity with the former but not the with latter. libgit2 has clean, well-documented APIs and an
+elegant implementation, which makes it so much easier to work with and to analyze performance
+bottlenecks.
+
+### Summary for the impatient
+
+Under the benchmark conditions described above, the equivalent of libgit2's
+`git_diff_index_to_workdir` (the most expensive part of `status` command) is 46.3 times faster in
+gitstatusd. The speedup comes from the following sources.
+
+* gitstatusd uses more efficient data structures and algorithms and employs performance-conscious
+coding style throughout the codebase. This reduces CPU time in userspace by 32x compared to libgit2.
+* gitstatusd uses less expensive system calls and makes fewer of them. This reduces CPU time spent
+in kernel by 1.9x.
+* gitstatusd can utilize multiple cores to scan index and workdir in parallel with almost perfect
+scaling. This reduces total run time by 12.4x while having virtually no effect on total CPU time.
+
+### Problem statement
+
+The most resource-intensive part of the `status` command is finding the difference between _index_
+and _workdir_ (`git_diff_index_to_workdir` in libgit2). Index is a list of all files in the git
+repository with their last modification times. This is an obvious simplification but it suffices for
+this exposition. On disk, index is stored sorted by file path. Here's an example of git index:
+
+| File        | Last modification time |
+|-------------|-----------------------:|
+| Makefile    |   2019-04-01T14:12:32Z |
+| src/hello.c |   2019-04-01T14:12:00Z |
+| src/hello.h |   2019-04-01T14:12:32Z |
+
+This list needs to be compared to the list of files in the working directory. If any of the files
+listed in the index are missing from the workdir or have different last modification time, they are
+"unstaged" in gitstatusd parlance. If you run `git status`, they'll be shown as "changes not staged
+for commit". Thus, any implementation of `status` command has to call `stat()` or one of its
+variants on every file in the index.
+
+In addition, all files in the working directory for which there is no entry in the index at all are
+"untracked". `git status` will show them as "untracked files". Finding untracked files requires some
+form of work directory traversal.
+
+### Single-threaded scan
+
+Let's see how `git_diff_index_to_workdir` from libgit2 accomplishes these tasks. Here's its CPU
+profile from 200 hot runs over chromium repository.
+
+![libgit2 CPU profile (hot)](
+  https://raw.githubusercontent.com/romkatv/gitstatus/1ac366952366d89980b3f3484f270b4fa5ae4293/cpu-profile-libgit2.png)
+
+(The CPU profile was created with [gperftools](https://github.com/gperftools/gperftools) and
+rendered with [pprof](https://github.com/google/pprof)).
+
+We can see `__GI__lxstat` taking a lot of time. This is the `stat()` call for every file in the
+index. We can also identify `__opendir`, `__readdir` and `__GI___close_nocancel` -- glibc wrappers
+for reading the contents of a directory. This is for finding untracked files. Out of the total 232
+seconds, 111 seconds -- or 47.7% -- was spent on these calls. The rest is computation -- comparing
+strings, sorting arrays, etc.
+
+Now let's take a look at the CPU profile of gitstatusd on the same task.
+
+![gitstatusd CPU profile (hot)](
+  https://raw.githubusercontent.com/romkatv/gitstatus/1ac366952366d89980b3f3484f270b4fa5ae4293/cpu-profile-gitstatusd-hot.png)
+
+The first impression is that this profile looks pruned. This isn't an artifact. The profile was
+generated with the same tools and the same flags as the profile of libgit2.
+
+Since both profiles were generated from the same workload, absolute numbers can be compared. We can
+see that gitstatusd took 62 seconds in total compared to libgit2's 232 seconds. System calls at the
+core of the algorithm are clearly visible. `__GI___fxstatat` is a flavor of `stat()`, and the other
+three calls -- `__libc_openat64`, `__libc_close` and `__GI___fxstat` are responsible for opening
+directories and finding untracked files. Notice that there is almost nothing else in the profile
+apart from these calls. The rest of the code accounts for 3.77 seconds of CPU time -- 32 times less
+than in libgit2.
+
+So, one reason gitstatusd is fast is that it has efficient diffing code -- very little time is spent
+outside of kernel. However, if we look closely, we can notice that system calls in gitstatusd are
+_also_ faster than in libgit2. For example, libgit2 spent 72.07 seconds in `__GI__lxstat` while
+gitstatusd spent only 48.82 seconds in `__GI___fxstatat`. There are two reasons for this difference.
+First, libgit2 makes more `stat()` calls than is strictly required. It's not necessary to stat
+directories because index only has files. There are 25k directories in chromium repository (and 300k
+files) -- that's 25k `stat()` calls that could be avoided. The second reason is that libgit2 and
+gitstatusd use different flavors of `stat()`. libgit2 uses `lstat()`, which takes a path to the file
+as input. Its performance is linear in the number of subdirectories in the path because it needs to
+perform a lookup for every one of them and to check permissions. gitstatusd uses `fstatat()`, which
+takes a file descriptor to the parent directory and a name of the file. Just a single lookup, less
+CPU time.
+
+Similarly to `lstat()` vs `fstatat()`, it's faster to open files and directories with `openat()`
+from the parent directory file descriptor than with regular `open()` that accepts full file path.
+gitstatusd takes advantage of `openat()` to open directories as fast as possible. It opens about 90%
+of the directories (this depends on the actual directory structure of the repository) from the
+immediate parent -- the most efficient way -- and the remaining 10% it opens from the repository's
+root directory. The reason it's done this way is to keep the maximum number of simultaneously open
+file descriptors bounded. libgit2 can have O(repository depth) simultaneously open file descriptors,
+which may be OK for a single-threaded application but can balloon to a large number when scans are
+done by many threads simultaneously, like in gitstatusd.
+
+There is no equivalent to `__opendir` or `__readdir` in the gitstatusd profile because it uses the
+equivalent of [untracked cache](https://git-scm.com/docs/git-update-index#_untracked_cache) from
+git. On the first scan of the workdir gitstatusd lists all files just like libgit2. But, unlike
+libgit2, it remembers the last modification time of every directory along with the list of
+untracked files under it. On the next scan, gitstatusd can skip listing files in directories whose
+last modification time hasn't changed.
+
+To summarize, here's what gitstatusd was doing when the CPU profile was captured:
+
+1. `__libc_openat64`: Open every directory for which there are files in the index.
+2. `__GI___fxstat`: Check last modification time of the directory. Since it's the same as on the
+   last scan, this directory has the same list of untracked files as before, which is empty (the
+   repository is clean).
+3. `__GI___fxstatat`: Check last modification time for every file in the index that belongs to this
+   directory.
+4. `__libc_close`: Close the file descriptor to the directory.
+
+Here's how the very first scan of a repository looks like in gitstatusd:
+
+![gitstatusd CPU profile (cold)](
+  https://raw.githubusercontent.com/romkatv/gitstatus/1ac366952366d89980b3f3484f270b4fa5ae4293/cpu-profile-gitstatusd-cold.png)
+
+(Some glibc functions are mislabel on this profile. `explicit_bzero` and `__nss_passwd_lookup` are
+in reality `strcmp` and `memcmp`.)
+
+This is a superset of the previous -- hot -- profile, with an extra `syscall` and string sorting for
+directory listing. gitstatusd uses `getdents64` Linux system call directly, bypassing the glibc
+wrapper that libgit2 uses. This is 23% faster. The details of this optimization can be found in a
+[separate document](docs/listdir.md).
+
+### Multithreading
+
+The diffing algorithm in gitstatusd was designed from the ground up with the intention of using it
+concurrently from multiple threads. With a fast SSD, `status` is CPU bound, so taking advantage of
+all available CPU cores is an obvious way to yield results faster.
+
+gitstatusd exhibits almost perfect scaling from multithreading. Engaging all cores allows it to
+produce results 12.4 times faster than in single-threaded execution. This is on Intel i9-7900X with
+10 cores (20 with hyperthreading) with single-core frequency of 4.3GHz and all-core frequency of
+4.0GHz.
+
+Note: `git status` also uses all available cores in some parts of its algorithm while `lg2` does
+everything in a single thread.
+
+### Postprocessing
+
+Once the difference between the index and the workdir is found, we have a list of _candidates_ --
+files that may be unstaged or untracked. To make the final judgement, these files need to be checked
+against `.gitignore` rules and a few other things.
+
+gitstatusd uses [patched libgit2](https://github.com/romkatv/libgit2) for this step. This fork
+adds several optimizations that make libgit2 faster. The patched libgit2 performs more than twice
+as fast in the benchmark as the original even without changes in the user code (that is, in the
+code that uses the libgit2 APIs). The fork also adds several API extensions, most notable of which
+is the support for multi-threaded scans. If `lg2 status` is modified to take advantage of these
+extensions, it outperforms the original libgit2 by a factor of 18. Lastly, the fork fixes a score of
+bugs, most of which become apparent only when using libgit2 from multiple threads.
+
+_WARNING: Changes to libgit2 are extensive but the testing they underwent isn't. It is
+**not recommended** to use the patched libgit2 in production._
+
+## Requirements
+
+* To compile: binutils, cmake, gcc, g++, git and GNU make.
+* To run: Linux, macOS, FreeBSD, Android, WSL, Cygwin or MSYS2.
+
+## Compiling
+
+There are prebuilt `gitstatusd` binaries in [releases](
+  https://github.com/romkatv/gitstatus/releases). When using the official shell bindings
+provided by gitstatus, the right binary for your architecture gets downloaded automatically.
+
+If prebuilt binaries don't work for you, you'll need to get your hands dirty.
+
+### Compiling for personal use
+
+```zsh
+git clone --depth=1 https://github.com/romkatv/gitstatus.git
+cd gitstatus
+./build -w -s -d docker
+```
+
+Users in China can use the official mirror on gitee.com for faster download.<br>
+中国大陆用户可以使用 gitee.com 上的官方镜像加速下载.
+
+```zsh
+git clone --depth=1 https://gitee.com/romkatv/gitstatus.git
+cd gitstatus
+./build -w -s -d docker
+```
+
+- If it says that `-d docker` is not supported on your OS, remove this flag.
+- If it says that `-s` is not supported on your OS, remove this flag.
+- If it tell you to install docker but you cannot or don't want to, remove `-d docker`.
+- If it says that some command is missing, install it.
+
+If everything goes well, the newly built binary will appear in `./usrbin`. It'll be picked up
+by shell bindings automatically.
+
+When you update shell bindings, they may refuse to work with the binary you've built earlier. In
+this case you'll need to rebuild.
+
+If you are using gitstatus through [Powerlevel10k](https://github.com/romkatv/powerlevel10k), the
+instructions are the same except that you don't need to clone gitstatus. Instead, change your
+current directory to `/path/to/powerlevel10k/gitstatus` (`/path/to/powerlevel10k` is the directory
+where you've installed Powerlevel10k) and run `./build -w -s -d docker` from there as described
+above.
+
+### Compiling for distribution
+
+It's currently neither easy nor recommended to package and distribute gitstatus. There are no
+instructions you can follow that would allow you to easily update your package when new versions of
+gitstatus are released. This may change in the future but not soon.
+
+## License
+
+GNU General Public License v3.0. See [LICENSE](LICENSE). Contributions are covered by the same
+license.

gitstatus/bin/gitstatusd-cygwin_nt-6.1-x86_64

@@ -1 +0,0 @@
-gitstatusd-cygwin_nt-10.0-x86_64

gitstatus/bin/gitstatusd-cygwin_nt-6.3-x86_64

@@ -1 +0,0 @@
-gitstatusd-cygwin_nt-10.0-x86_64

gitstatus/bin/gitstatusd-freebsd-x86_64

@@ -1 +0,0 @@
-gitstatusd-freebsd-amd64

gitstatus/bin/gitstatusd-linux-armv6l

@@ -1 +0,0 @@
-gitstatusd-linux-armv7l

gitstatus/build

@@ -0,0 +1,667 @@
+#!/bin/sh
+#
+# Type `build -h` for help and see https://github.com/romkatv/gitstatus
+# for full documentation.
+
+set -ue
+
+if [ -n "${ZSH_VERSION:-}" ]; then
+  emulate sh -o err_exit -o no_unset
+fi
+
+export LC_ALL=C
+
+if [ -z "${ZSH_VERSION-}" ] && command -v zsh >/dev/null 2>&1; then
+  # Avoid bash 3.*.
+  case "${BASH_VERSION-}" in
+    [0-3].*) exec zsh "$0" "$@";;
+  esac
+fi
+
+# Avoid ksh: https://github.com/romkatv/gitstatus/issues/282.
+if [ -n "${KSH_VERSION-}" ]; then
+  if [ -z "${ZSH_VERSION-}" ] && command -v zsh >/dev/null 2>&1; then
+    exec zsh "$0" "$@"
+  elif [ -z "${BASH_VERSION-}" ] && command -v bash >/dev/null 2>&1 &&
+       bash_version="$(bash --version 2>&1)"; then
+    case "$bash_version" in
+      *version\ [4-9]*|*version\ [1-9][0-9]*) exec bash "$0" "$@";;
+    esac
+  fi
+fi
+
+usage="$(command cat <<\END
+Usage: build [-m ARCH] [-c CPU] [-d CMD] [-i IMAGE] [-s] [-w]
+
+Options:
+
+  -m ARCH   `uname -m` from the target machine; defaults to `uname -m`
+            from the local machine
+  -c CPU    generate machine instructions for CPU of this type; this
+            value gets passed as `-march` (or `-mcpu` for ppc64le) to gcc;
+            inferred from ARCH if not set explicitly
+  -d CMD    build in a Docker container and use CMD as the `docker`
+            command; e.g., `-d docker` or `-d podman`
+  -i IMAGE  build in this Docker image; inferred from ARCH if not set
+            explicitly
+  -s        install whatever software is necessary for build to
+            succeed; on some operating systems this option is not
+            supported; on others it can have partial effect
+  -w        automatically download tarballs for dependencies if they
+            do not already exist in ./deps; dependencies are described
+            in ./build.info
+END
+)"
+
+build="$(command cat <<\END
+outdir="$(command pwd)"
+
+if command -v mktemp >/dev/null 2>&1; then
+  workdir="$(command mktemp -d "${TMPDIR:-/tmp}"/gitstatus-build.XXXXXXXXXX)"
+else
+  workdir="${TMPDIR:-/tmp}/gitstatus-build.tmp.$$"
+  command mkdir -- "$workdir"
+fi
+
+cd -- "$workdir"
+workdir="$(command pwd)"
+
+narg() { echo $#; }
+
+if [ "$(narg $workdir)" != 1 -o -z "${workdir##*:*}" -o -z "${workdir##*=*}" ]; then
+  >&2 echo "[error] cannot build in this directory: $workdir"
+  exit 1
+fi
+
+appname=gitstatusd
+libgit2_tmp="$outdir"/deps/"$appname".libgit2.tmp
+
+cleanup() {
+  trap - INT QUIT TERM ILL PIPE
+  cd /
+  if ! command rm -rf -- "$workdir" "$outdir"/usrbin/"$appname".tmp "$libgit2_tmp"; then
+    command sleep 5
+    command rm -rf -- "$workdir" "$outdir"/usrbin/"$appname".tmp "$libgit2_tmp"
+  fi
+}
+trap cleanup INT QUIT TERM ILL PIPE
+
+if [ -n "$gitstatus_install_tools" ]; then
+  case "$gitstatus_kernel" in
+    linux)
+      if command -v apk >/dev/null 2>&1; then
+        command apk update
+        command apk add binutils cmake gcc g++ git make musl-dev perl-utils
+      elif command -v apt-get >/dev/null 2>&1; then
+        apt-get update
+        apt-get install -y binutils cmake gcc g++ make wget
+      else
+        >&2 echo "[error] -s is not supported on this system"
+        exit 1
+      fi
+    ;;
+    freebsd|dragonfly)
+      command pkg install -y cmake gmake binutils git perl5 wget
+    ;;
+    openbsd)
+      command pkg_add cmake gmake gcc g++ git wget
+    ;;
+    netbsd)
+      command pkgin -y install cmake gmake binutils git
+    ;;
+    darwin)
+      if ! command -v make >/dev/null 2>&1 || ! command -v gcc >/dev/null 2>&1; then
+        >&2 echo "[error] please run 'xcode-select --install' and retry"
+        exit 1
+      fi
+      if command -v port >/dev/null 2>&1; then
+        sudo port -N install libiconv cmake wget
+      elif command -v brew >/dev/null 2>&1; then
+        for formula in libiconv cmake git wget; do
+          if command brew ls --version "$formula" &>/dev/null; then
+            command brew upgrade "$formula"
+          else
+            command brew install "$formula"
+          fi
+        done
+      else
+        >&2 echo "[error] please install MacPorts or Homebrew and retry"
+        exit 1
+      fi
+    ;;
+    msys*|mingw*)
+      command pacman -Syu --noconfirm
+      command pacman -S --needed --noconfirm binutils cmake gcc git make perl
+    ;;
+    *)
+      >&2 echo "[internal error] unhandled kernel: $gitstatus_kernel"
+      exit 1
+    ;;
+  esac
+fi
+
+cpus="$(command getconf _NPROCESSORS_ONLN 2>/dev/null)" ||
+  cpus="$(command sysctl -n hw.ncpu 2>/dev/null)"       ||
+  cpus=8
+
+case "$gitstatus_cpu" in
+  powerpc64|powerpc64le)
+    archflag="-mcpu"
+  ;;
+  *)
+    archflag="-march"
+  ;;
+esac
+
+case "$gitstatus_arch" in
+  e2k)
+    nopltflag=""
+  ;;
+  *)
+    nopltflag="-fno-plt"
+  ;;
+esac
+
+cflags="$archflag=$gitstatus_cpu $nopltflag -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fpie"
+ldflags=
+static_pie=
+
+if [ -z "${CC-}" ]; then
+  case "$gitstatus_kernel" in
+    freebsd) export CC=clang;;
+    *)       export CC=cc;;
+  esac
+fi
+
+printf 'int main() {}\n' >"$workdir"/cc-test.c
+if 2>/dev/null "$CC"   \
+     -ffile-prefix-map=x=y   \
+     -Werror                 \
+     -c "$workdir"/cc-test.c \
+     -o "$workdir"/cc-test.o; then
+  cflags="$cflags -ffile-prefix-map=$workdir/="
+fi
+
+command rm -f -- "$workdir"/cc-test "$workdir"/cc-test.o
+if 2>/dev/null "$CC"          \
+     -fstack-clash-protection \
+     -Werror                  \
+     -c "$workdir"/cc-test.c  \
+     -o "$workdir"/cc-test.o; then
+  cflags="$cflags -fstack-clash-protection"
+fi
+
+command rm -f -- "$workdir"/cc-test "$workdir"/cc-test.o
+if 2>/dev/null "$CC"         \
+     -fcf-protection         \
+     -Werror                 \
+     -c "$workdir"/cc-test.c \
+     -o "$workdir"/cc-test.o; then
+  cflags="$cflags -fcf-protection"
+fi
+
+command rm -f -- "$workdir"/cc-test "$workdir"/cc-test.o
+if 2>/dev/null "$CC"                             \
+     -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now \
+     -Werror                                           \
+     "$workdir"/cc-test.c                              \
+     -o "$workdir"/cc-test; then
+  ldflags="$ldflags -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
+fi
+
+command rm -f -- "$workdir"/cc-test "$workdir"/cc-test.o
+if 2>/dev/null "$CC" \
+     -fpie -static-pie     \
+     -Werror               \
+     "$workdir"/cc-test.c  \
+     -o "$workdir"/cc-test; then
+  static_pie='-static-pie'
+fi
+
+if [ "$gitstatus_cpu" = x86-64 ]; then
+  cflags="$cflags -mtune=generic"
+fi
+
+libgit2_cmake_flags=
+libgit2_cflags="${CFLAGS-} $cflags -O3 -DNDEBUG"
+
+gitstatus_cxx=g++
+gitstatus_cxxflags="${CXXFLAGS-} $cflags -I${workdir}/libgit2/include -DGITSTATUS_ZERO_NSEC -D_GNU_SOURCE -D_GLIBCXX_ASSERTIONS"
+gitstatus_ldflags="${LDFLAGS-} $ldflags -L${workdir}/libgit2/build"
+gitstatus_ldlibs=
+gitstatus_make=make
+
+case "$gitstatus_kernel" in
+  linux)
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  freebsd)
+    gitstatus_cxx=clang++
+    gitstatus_make=gmake
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  dragonfly)
+    gitstatus_cxx=clang++12
+    gitstatus_make=gmake
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  openbsd)
+    gitstatus_cxx=eg++
+    gitstatus_make=gmake
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  netbsd)
+    gitstatus_make=gmake
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  darwin)
+    command mkdir -- "$workdir"/lib
+    if [ -e /opt/local/lib/libiconv.a ]; then
+      command ln -s -- /opt/local/lib/libiconv.a "$workdir"/lib
+      libgit2_cflags="$libgit2_cflags -I/opt/local/include"
+      gitstatus_cxxflags="$gitstatus_cxxflags -I/opt/local/include"
+    else
+      brew_prefix="$(command brew --prefix)"
+      command ln -s -- "$brew_prefix"/opt/libiconv/lib/libiconv.a "$workdir"/lib
+      libgit2_cflags="$libgit2_cflags -I"$brew_prefix"/opt/libiconv/include"
+      gitstatus_cxxflags="$gitstatus_cxxflags -I"$brew_prefix"/opt/libiconv/include"
+    fi
+    libgit2_cmake_flags="$libgit2_cmake_flags -DUSE_ICONV=ON"
+    gitstatus_ldlibs="$gitstatus_ldlibs -liconv"
+    gitstatus_ldflags="$gitstatus_ldflags -L${workdir}/lib"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=OFF"
+  ;;
+  msys*|mingw*)
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  cygwin*)
+    gitstatus_ldflags="$gitstatus_ldflags ${static_pie:--static}"
+    libgit2_cmake_flags="$libgit2_cmake_flags -DENABLE_REPRODUCIBLE_BUILDS=ON"
+  ;;
+  *)
+    >&2 echo "[internal error] unhandled kernel: $gitstatus_kernel"
+    exit 1
+  ;;
+esac
+
+for cmd in cat cmake git ld ln mkdir rm strip tar "$gitstatus_make"; do
+  if ! command -v "$cmd" >/dev/null 2>&1; then
+    if [ -n "$gitstatus_install_tools" ]; then
+      >&2 echo "[internal error] $cmd not found"
+      exit 1
+    else
+      >&2 echo "[error] command not found: $cmd"
+      exit 1
+    fi
+  fi
+done
+
+. "$outdir"/build.info
+if [ -z "${libgit2_version:-}" ]; then
+  >&2 echo "[internal error] libgit2_version not set"
+  exit 1
+fi
+if [ -z "${libgit2_sha256:-}" ]; then
+  >&2 echo "[internal error] libgit2_sha256 not set"
+  exit 1
+fi
+libgit2_tarball="$outdir"/deps/libgit2-"$libgit2_version".tar.gz
+if [ ! -e "$libgit2_tarball" ]; then
+  if [ -n "$gitstatus_download_deps" ]; then
+    if ! command -v wget >/dev/null 2>&1; then
+      if [ -n "$gitstatus_install_tools" ]; then
+        >&2 echo "[internal error] wget not found"
+        exit 1
+      else
+        >&2 echo "[error] command not found: wget"
+        exit 1
+      fi
+    fi
+    libgit2_url=https://github.com/romkatv/libgit2/archive/"$libgit2_version".tar.gz
+    if ! >"$libgit2_tmp" command wget --no-config -qO- -- "$libgit2_url" &&
+       ! >"$libgit2_tmp" command wget             -qO- -- "$libgit2_url"; then
+      set -x
+      >&2 command which wget
+      >&2 command ls -lAd -- "$(command which wget)"
+      >&2 command ls -lAd -- "$outdir"
+      >&2 command ls -lA -- "$outdir"
+      >&2 command ls -lAd -- "$outdir"/deps
+      >&2 command ls -lA -- "$outdir"/deps
+      set +x
+      exit 1
+    fi
+    command mv -f -- "$libgit2_tmp" "$libgit2_tarball"
+  else
+    >&2 echo "[error] file not found: deps/libgit2-"$libgit2_version".tar.gz"
+    exit 1
+  fi
+fi
+
+libgit2_actual_sha256=
+if command -v shasum >/dev/null 2>/dev/null; then
+  libgit2_actual_sha256="$(command shasum -b -a 256 -- "$libgit2_tarball")"
+  libgit2_actual_sha256="${libgit2_actual_sha256%% *}"
+elif command -v sha256sum >/dev/null 2>/dev/null; then
+  libgit2_actual_sha256="$(command sha256sum -b -- "$libgit2_tarball")"
+  libgit2_actual_sha256="${libgit2_actual_sha256%% *}"
+elif command -v sha256 >/dev/null 2>/dev/null; then
+  libgit2_actual_sha256="$(command sha256 -- "$libgit2_tarball" </dev/null)"
+  # Ignore sha256 output if it's from hashalot. It's incompatible.
+  if [ ${#libgit2_actual_sha256} -lt 64 ]; then
+    libgit2_actual_sha256=
+  else
+    libgit2_actual_sha256="${libgit2_actual_sha256##* }"
+  fi
+fi
+
+if [ -z "$libgit2_actual_sha256" ]; then
+  >&2 echo "[error] command not found: shasum or sha256sum"
+  exit 1
+fi
+
+if [ "$libgit2_actual_sha256" != "$libgit2_sha256" ]; then
+  >&2 echo "[error] sha256 mismatch"
+  >&2 echo ""
+  >&2 echo "  file    : deps/libgit2-$libgit2_version.tar.gz"
+  >&2 echo "  expected: $libgit2_sha256"
+  >&2 echo "  actual  : $libgit2_actual_sha256"
+  exit 1
+fi
+
+cd -- "$workdir"
+command tar -xzf "$libgit2_tarball"
+command mv -- libgit2-"$libgit2_version" libgit2
+command mkdir libgit2/build
+cd libgit2/build
+
+CFLAGS="$libgit2_cflags" command cmake \
+  -DCMAKE_BUILD_TYPE=None              \
+  -DZERO_NSEC=ON                       \
+  -DTHREADSAFE=ON                      \
+  -DUSE_BUNDLED_ZLIB=ON                \
+  -DREGEX_BACKEND=builtin              \
+  -DUSE_HTTP_PARSER=builtin            \
+  -DUSE_SSH=OFF                        \
+  -DUSE_HTTPS=OFF                      \
+  -DBUILD_CLAR=OFF                     \
+  -DUSE_GSSAPI=OFF                     \
+  -DUSE_NTLMCLIENT=OFF                 \
+  -DBUILD_SHARED_LIBS=OFF              \
+  -G "Unix Makefiles"                  \
+  $libgit2_cmake_flags                 \
+  ..
+command make -j "$cpus" VERBOSE=1
+
+APPNAME="$appname".tmp           \
+  OBJDIR="$workdir"/gitstatus    \
+  CXX="${CXX:-$gitstatus_cxx}"   \
+  CXXFLAGS="$gitstatus_cxxflags" \
+  LDFLAGS="$gitstatus_ldflags"   \
+  LDLIBS="$gitstatus_ldlibs"     \
+  command "$gitstatus_make" -C "$outdir" -j "$cpus"
+
+app="$outdir"/usrbin/"$appname"
+
+command strip "$app".tmp
+
+command mkdir -- "$workdir"/repo
+printf '[init]\n  defaultBranch = master\n' >"$workdir"/.gitconfig
+(
+  cd -- "$workdir"/repo
+  GIT_CONFIG_NOSYSTEM=1 HOME="$workdir" command git init
+  GIT_CONFIG_NOSYSTEM=1 HOME="$workdir" command git config user.name "Your Name"
+  GIT_CONFIG_NOSYSTEM=1 HOME="$workdir" command git config user.email "you@example.com"
+  GIT_CONFIG_NOSYSTEM=1 HOME="$workdir" command git commit \
+    --allow-empty --allow-empty-message --no-gpg-sign -m ''
+)
+
+resp="$(printf "hello\037$workdir/repo\036" | "$app".tmp)"
+case "$resp" in
+  hello*1*/repo*master*);;
+  *)
+    >&2 echo 'error: invalid gitstatusd response for a git repo'
+    exit 1
+  ;;
+esac
+
+resp="$(printf 'hello\037\036' | "$app".tmp)"
+case "$resp" in
+  hello*0*);;
+  *)
+    >&2 echo 'error: invalid gitstatusd response for a non-repo'
+    exit 1
+  ;;
+esac
+
+command mv -f -- "$app".tmp "$app"
+
+cleanup
+
+command cat >&2 <<-END
+	-------------------------------------------------
+	SUCCESS: created usrbin/$appname
+	END
+END
+)"
+
+docker_image=
+docker_cmd=
+
+gitstatus_arch=
+gitstatus_cpu=
+gitstatus_install_tools=
+gitstatus_download_deps=
+
+while getopts ':m:c:i:d:swh' opt "$@"; do
+  case "$opt" in
+    h)
+      printf '%s\n' "$usage"
+      exit
+    ;;
+    m)
+      if [ -n "$gitstatus_arch" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      if [ -z "$OPTARG" ]; then
+        >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+        exit 1
+      fi
+      gitstatus_arch="$OPTARG"
+    ;;
+    c)
+      if [ -n "$gitstatus_cpu" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      if [ -z "$OPTARG" ]; then
+        >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+        exit 1
+      fi
+      gitstatus_cpu="$OPTARG"
+    ;;
+    i)
+      if [ -n "$docker_image" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      if [ -z "$OPTARG" ]; then
+        >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+        exit 1
+      fi
+      docker_image="$OPTARG"
+    ;;
+    d)
+      if [ -n "$docker_cmd" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      if [ -z "$OPTARG" ]; then
+        >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+        exit 1
+      fi
+      docker_cmd="$OPTARG"
+    ;;
+    s)
+      if [ -n "$gitstatus_install_tools" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      gitstatus_install_tools=1
+    ;;
+    w)
+      if [ -n "$gitstatus_download_deps" ]; then
+        >&2 echo "[error] duplicate option: -$opt"
+        exit 1
+      fi
+      gitstatus_download_deps=1
+    ;;
+    \?) >&2 echo "[error] invalid option: -$OPTARG"           ; exit 1;;
+    :)  >&2 echo "[error] missing required argument: -$OPTARG"; exit 1;;
+    *)  >&2 echo "[internal error] unhandled option: -$opt"   ; exit 1;;
+  esac
+done
+
+if [ "$OPTIND" -le $# ]; then
+  >&2 echo "[error] unexpected positional argument"
+  exit 1
+fi
+
+if [ -n "$docker_image" -a -z "$docker_cmd" ]; then
+  >&2 echo "[error] cannot use -i without -d"
+  exit 1
+fi
+
+if [ -z "$gitstatus_arch" ]; then
+  gitstatus_arch="$(uname -m)"
+  gitstatus_arch="$(printf '%s' "$gitstatus_arch" | tr '[A-Z]' '[a-z]')"
+fi
+
+if [ -z "$gitstatus_cpu" ]; then
+  case "$gitstatus_arch" in
+    armel)          gitstatus_cpu=armv5;;
+    armv6l|armhf)   gitstatus_cpu=armv6;;
+    armv7l)         gitstatus_cpu=armv7;;
+    arm64|aarch64)  gitstatus_cpu=armv8-a;;
+    ppc64|ppc64le)  gitstatus_cpu=powerpc64le;;
+    riscv64)        gitstatus_cpu=rv64imafdc;;
+    loongarch64)    gitstatus_cpu=loongarch64;;
+    x86_64|amd64)   gitstatus_cpu=x86-64;;
+    x86)            gitstatus_cpu=i586;;
+    s390x)          gitstatus_cpu=z900;;
+    e2k)            gitstatus_cpu=native;;
+    i386|i586|i686) gitstatus_cpu="$gitstatus_arch";;
+    *)
+      >&2 echo '[error] unable to infer target CPU architecture'
+      >&2 echo 'Please specify explicitly with `-c CPU`.'
+      exit 1
+    ;;
+  esac
+fi
+
+gitstatus_kernel="$(uname -s)"
+gitstatus_kernel="$(printf '%s' "$gitstatus_kernel" | tr '[A-Z]' '[a-z]')"
+
+case "$gitstatus_kernel" in
+  linux)
+    if [ -n "$docker_cmd" ]; then
+      if [ -z "${docker_cmd##*/*}" ]; then
+        if [ ! -x "$docker_cmd" ]; then
+          >&2 echo "[error] not an executable file: $docker_cmd"
+          exit 1
+        fi
+      else
+        if ! command -v "$docker_cmd" >/dev/null 2>&1; then
+          >&2 echo "[error] command not found: $docker_cmd"
+          exit 1
+        fi
+      fi
+      if [ -z "$docker_image" ]; then
+        case "$gitstatus_arch" in
+          x86_64)             docker_image=alpine:3.11.6;;
+          x86|i386|i586|i686) docker_image=i386/alpine:3.11.6;;
+          armv6l|armhf)       docker_image=arm32v6/alpine:3.11.6;;
+          armv7l)             docker_image=arm32v7/alpine:3.11.6;;
+          aarch64)            docker_image=arm64v8/alpine:3.11.6;;
+          ppc64|ppc64le)      docker_image=ppc64le/alpine:3.11.6;;
+          s390x)              docker_image=s390x/alpine:3.11.6;;
+          *)
+            >&2 echo '[error] unable to infer docker image'
+            >&2 echo 'Please specify explicitly with `-i IMAGE`.'
+            exit 1
+          ;;
+        esac
+      fi
+    fi
+  ;;
+  freebsd|openbsd|netbsd|darwin|dragonfly)
+    if [ -n "$docker_cmd" ]; then
+      >&2 echo "[error] docker (-d) is not supported on $gitstatus_kernel"
+      exit 1
+    fi
+  ;;
+  msys_nt-*|mingw32_nt-*|mingw64_nt-*|cygwin_nt-*)
+    if ! printf '%s' "$gitstatus_kernel" | grep -Eqx '[^-]+-[0-9]+\.[0-9]+(-.*)?'; then
+      >&2 echo '[error] unsupported kernel, sorry!'
+      exit 1
+    fi
+    gitstatus_kernel="$(printf '%s' "$gitstatus_kernel" | sed 's/^\([^-]*-[0-9]*\.[0-9]*\).*/\1/')"
+    if [ -n "$docker_cmd" ]; then
+      >&2 echo '[error] docker (-d) is not supported on windows'
+      exit 1
+    fi
+    if [ -n "$gitstatus_install_tools" -a -z "${gitstatus_kernel##cygwin_nt-*}" ]; then
+      >&2 echo '[error] -s is not supported on cygwin'
+      exit 1
+    fi
+  ;;
+  *)
+    >&2 echo '[error] unsupported kernel, sorry!'
+    exit 1
+  ;;
+esac
+
+dir="$(dirname -- "$0")"
+cd -- "$dir"
+dir="$(pwd)"
+
+>&2 echo "Building gitstatusd..."
+>&2 echo ""
+>&2 echo "  kernel := $gitstatus_kernel"
+>&2 echo "  arch := $gitstatus_arch"
+>&2 echo "  cpu := $gitstatus_cpu"
+[ -z "$docker_cmd" ] || >&2 echo "  docker command := $docker_cmd"
+[ -z "$docker_image"  ] || >&2 echo "  docker image := $docker_image"
+if [ -n "$gitstatus_install_tools" ]; then
+  >&2 echo "  install tools := yes"
+else
+  >&2 echo "  install tools := no"
+fi
+if [ -n "$gitstatus_download_deps" ]; then
+  >&2 echo "  download deps := yes"
+else
+  >&2 echo "  download deps := no"
+fi
+
+if [ -n "$docker_cmd" ]; then
+  "$docker_cmd" run                                       \
+    -e docker_cmd="$docker_cmd"                           \
+    -e docker_image="$docker_image"                       \
+    -e gitstatus_kernel="$gitstatus_kernel"               \
+    -e gitstatus_arch="$gitstatus_arch"                   \
+    -e gitstatus_cpu="$gitstatus_cpu"                     \
+    -e gitstatus_install_tools="$gitstatus_install_tools" \
+    -e gitstatus_download_deps="$gitstatus_download_deps" \
+    -v "$dir":/out                                        \
+    -w /out                                               \
+    --rm                                                  \
+    -- "$docker_image" /bin/sh -uexc "$build"
+else
+  eval "$build"
+fi

gitstatus/build.info

@@ -0,0 +1,22 @@
+# This value gets embedded in gitstatusd at build time. It is
+# read by ./Makefile. `gitstatusd --version` reports it back.
+#
+# This value is also read by shell bindings (indirectly, through
+# ./install) when using GITSTATUS_DAEMON or usrbin/gitstatusd.
+gitstatus_version="v1.5.5"
+
+# libgit2 is a build time dependency of gitstatusd. The values of
+# libgit2_version and libgit2_sha256 are read by ./build.
+#
+# If ./deps/libgit2-${libgit2_version}.tar.gz doesn't exist, build
+# downloads it from the following location:
+#
+#   https://github.com/romkatv/libgit2/archive/${libgit2_version}.tar.gz
+#
+# Once downloaded, the tarball is stored at the path indicated
+# above so that repeated builds don't consume network bandwidth.
+#
+# If sha256 of ./deps/libgit2-${libgit2_version}.tar.gz doesn't match,
+# build gets aborted.
+libgit2_version="tag-2ecf33948a4df9ef45a66c68b8ef24a5e60eaac6"
+libgit2_sha256="4ce11d71ee576dbbc410b9fa33a9642809cc1fa687b315f7c23eeb825b251e93"

gitstatus/docs/listdir.md

@@ -0,0 +1,330 @@
+# Fast directory listing
+
+In order to find untracked files in a git repository, [gitstatusd](../README.md) needs to list the
+contents of every directory. gitstatusd does it 27% faster than a reasonable implementation that a
+seasoned C/C++ practitioner might write. This document explains the optimizations that went into it.
+As directory listing is a common operation, many other projects can benefit from applying these
+optimizations.
+
+## v1
+
+Given a path to a directory, `ListDir()` must produce the list of files in that directory. Moreover,
+the list must be sorted lexicographically to enable fast comparison with Git index.
+
+The following C++ implementation gets the job done. For simplicity, it returns an empty list on
+error.
+
+```c++
+vector<string> ListDir(const char* dirname) {
+  vector<string> entries;
+  if (DIR* dir = opendir(dirname)) {
+    while (struct dirent* ent = (errno = 0, readdir(dir))) {
+      if (!Dots(ent->d_name)) entries.push_back(ent->d_name);
+    }
+    if (errno) entries.clear();
+    sort(entries.begin(), entries.end());
+    closedir(dir);
+  }
+  return entries;
+}
+```
+
+Every directory has entries `"."` and `".."`, which we aren't interested in. We filter them out with
+a helper function `Dots()`.
+
+```c++
+bool Dots(const char* s) { return s[0] == '.' && (!s[1] || (s[1] == '.' && !s[2])); }
+```
+
+To check how fast `ListDir()` performs, we can run it many times on a typical directory. One million
+runs on a directory with 32 files with 16-character names takes 12.7 seconds.
+
+## v2
+
+Experienced C++ practitioners will scoff at our implementation of `ListDir()`. If it's meant to be
+efficient, returning `vector<string>` is an unaffordable convenience. To avoid heap allocations we
+can use a simple arena that will allow us to reuse memory between different `ListDir()` calls.
+
+(Changed and added lines are marked with comments.)
+
+```c++
+void ListDir(const char* dirname, string& arena, vector<char*>& entries) {  // +
+  entries.clear();                                                          // +
+  if (DIR* dir = opendir(dirname)) {
+    arena.clear();                                                          // +
+    while (struct dirent* ent = (errno = 0, readdir(dir))) {
+      if (!Dots(ent->d_name)) {
+        entries.push_back(reinterpret_cast<char*>(arena.size()));           // +
+        arena.append(ent->d_name, strlen(ent->d_name) + 1);                 // +
+      }
+    }
+    if (errno) entries.clear();
+    for (char*& p : entries) p = &arena[reinterpret_cast<size_t>(p)];      // +
+    sort(entries.begin(), entries.end(),                                   // +
+         [](const char* a, const char* b) { return strcmp(a, b) < 0; });   // +
+    closedir(dir);
+  }
+}
+```
+
+To make performance comparison easier, we can normalize them relative to the baseline. v1 will get
+performance score of 100. A twice-as-fast alternative will be 200.
+
+| version |     optimization           |     score |
+|---------|----------------------------|----------:|
+| v1      | baseline                   |     100.0 |
+| **v2**  | **avoid heap allocations** | **112.7** |
+
+Avoiding heap allocations makes `ListDir()` 12.7% faster. Not bad. As an added bonus, those casts
+will fend off the occasional frontend developer who accidentally wanders into the codebase.
+
+## v3
+
+`opendir()` is an expensive call whose performance is linear in the number of subdirectories in the
+path because it needs to perform a lookup for every one of them. We can replace it with `openat()`,
+which takes a file descriptor to the parent directory and a name of the subdirectory. Just a single
+lookup, less CPU time. This optimization assumes that callers already have a descriptor to the
+parent directory, which is indeed the case for gitstatusd, and is often the case in other
+applications that traverse filesystem.
+
+```c++
+void ListDir(int parent_fd, const char* dirname, string& arena, vector<char*>& entries) {   // +
+  entries.clear();
+  int dir_fd = openat(parent_fd, dirname, O_NOATIME | O_RDONLY | O_DIRECTORY | O_CLOEXEC);  // +
+  if (dir_fd < 0) return;                                                                   // +
+  if (DIR* dir = fdopendir(dir_fd)) {
+    arena.clear();
+    while (struct dirent* ent = (errno = 0, readdir(dir))) {
+      if (!Dots(ent->d_name)) {
+        entries.push_back(reinterpret_cast<char*>(arena.size()));
+        arena.append(ent->d_name, strlen(ent->d_name) + 1);
+      }
+    }
+    if (errno) entries.clear();
+    for (char*& p : entries) p = &arena[reinterpret_cast<size_t>(p)];
+    sort(entries.begin(), entries.end(),
+         [](const char* a, const char* b) { return strcmp(a, b) < 0; });
+    closedir(dir);
+  } else {                                                                                  // +
+    close(dir_fd);                                                                          // +
+  }                                                                                         // +
+}
+```
+
+This is worth about 3.5% in speed.
+
+| version | optimization                         |     score |
+|---------|--------------------------------------|----------:|
+| v1      | baseline                             |     100.0 |
+| v2      | avoid heap allocations               |     112.7 |
+| **v3**  | **open directories with `openat()`** | **116.2** |
+
+## v4
+
+Copying file names to the arena isn't free but it doesn't seem like we can avoid it. Poking around
+we can see that the POSIX API we are using is implemented on Linux on top of `getdents64` system
+call. Its documentation isn't very encouraging:
+
+```text
+These are not the interfaces you are interested in.  Look at
+readdir(3) for the POSIX-conforming C library interface.  This page
+documents the bare kernel system call interfaces.
+
+Note: There are no glibc wrappers for these system calls.
+```
+
+Hmm... The API looks like something we can take advantage of, so let's try it anyway.
+
+First, we'll need a simple `Arena` class that can allocate 8KB blocks of memory.
+
+```c++
+class Arena {
+ public:
+  enum { kBlockSize = 8 << 10 };
+
+  char* Alloc() {
+    if (cur_ == blocks_.size()) blocks_.emplace_back(kBlockSize, 0);
+    return blocks_[cur_++].data();
+  }
+
+  void Clear() { cur_ = 0; }
+
+ private:
+  size_t cur_ = 0;
+  vector<string> blocks_;
+};
+```
+
+Next, we need to define `struct dirent64_t` ourselves because there is no wrapper for the system
+call we are about to use.
+
+```c++
+struct dirent64_t {
+  ino64_t d_ino;
+  off64_t d_off;
+  unsigned short d_reclen;
+  unsigned char d_type;
+  char d_name[];
+};
+```
+
+Finally we can get to the implementation of `ListDir()`.
+
+```c++
+void ListDir(int parent_fd, Arena& arena, vector<char*>& entries) {                       // +
+  entries.clear();
+  int dir_fd = openat(parent_fd, dirname, O_NOATIME | O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  if (dir_fd < 0) return;
+  arena.Clear();                                                                          // +
+  while (true) {                                                                          // +
+    char* buf = arena.Alloc();                                                            // +
+    int n = syscall(SYS_getdents64, dir_fd, buf, Arena::kBlockSize);                      // +
+    if (n <= 0) {                                                                         // +
+      if (n) entries.clear();                                                             // +
+      break;                                                                              // +
+    }                                                                                     // +
+    for (int pos = 0; pos < n;) {                                                         // +
+      auto* ent = reinterpret_cast<dirent64_t*>(buf + pos);                               // +
+      if (!Dots(ent->d_name)) entries.push_back(ent->d_name);                             // +
+      pos += ent->d_reclen;                                                               // +
+    }                                                                                     // +
+  }                                                                                       // +
+  sort(entries.begin(), entries.end(),
+       [](const char* a, const char* b) { return strcmp(a, b) < 0; });
+  close(dir_fd);
+}
+```
+
+How are we doing with this one?
+
+| version | optimization                     |     score |
+|---------|----------------------------------|----------:|
+| v1      | baseline                         |     100.0 |
+| v2      | avoid heap allocations           |     112.7 |
+| v3      | open directories with `openat()` |     116.2 |
+| **v4**  | **call `getdents64()` directly** | **137.8** |
+
+Solid 20% speedup. Worth the trouble. Unfortunately, we now have just one `reinterpret_cast` instead
+of two, and it's not nearly as scary-looking. Hopefully with the next iteration we can get back some
+of that evil vibe of low-level code.
+
+As a bonus, every element in `entries` has `d_type` at offset -1. This can be useful to the callers
+that need to distinguish between regular files and directories (gitstatusd, in fact, needs this).
+Note how `ListDir()` implements this feature at zero cost, as a lucky accident of `dirent64_t`
+memory layout.
+
+## v5
+
+The CPU profile of `ListDir()` reveals that almost all userspace CPU time is spent in `strcmp()`.
+Digging into the source code of `std::sort()` we can see that it uses Insertion Sort for short
+collections. Our 32-element vector falls under the threshold. Insertion Sort makes `O(N^2)`
+comparisons, hence a lot of CPU time in `strcmp()`. Switching to `qsort()` or
+[Timsort](https://en.wikipedia.org/wiki/Timsort) is of no use as all good sorting algorithms fall
+back to Insertion Sort.
+
+If we cannot make fewer comparisons, perhaps we can make each of them faster? `strcmp()` compares
+characters one at a time. It cannot read ahead as it can be illegal to touch memory past the first
+null byte. But _we_ know that it's safe to read a few extra bytes past the end of `d_name` for every
+entry except the last in the buffer. And since we own the buffer, we can overallocate it so that
+reading past the end of the last entry is also safe.
+
+Combining these ideas with the fact that file names on Linux are at most 255 bytes long, we can
+invoke `getdents64()` like this:
+
+```c++
+int n = syscall(SYS_getdents64, dir_fd, buf, Arena::kBlockSize - 256);
+```
+
+And then compare entries like this:
+
+```c++
+[](const char* a, const char* b) { return memcmp(a, b, 255) < 0; }
+```
+
+This version doesn't give any speedup compared to the previous but it opens an avenue for another
+optimization. The pointers we pass to `memcmp()` aren't aligned. To be more specific, their
+numerical values are `N * 8 + 3` for some `N`. When given such a pointer, `memcmp()` will check the
+first 5 bytes one by one, and only then switch to comparing 8 bytes at a time. If we can handle the
+first 5 bytes ourselves, we can pass aligned memory to `memcmp()` and take full advantage of its
+vectorized loop.
+
+Here's the implementation:
+
+```c++
+uint64_t Read64(const void* p) {                                                          // +
+  uint64_t x;                                                                             // +
+  memcpy(&x, p, sizeof(x));                                                               // +
+  return x;                                                                               // +
+}                                                                                         // +
+
+void ByteSwap64(void* p) {                                                                // +
+  uint64_t x = __builtin_bswap64(Read64(p));                                              // +
+  memcpy(p, &x, sizeof(x));                                                               // +
+}                                                                                         // +
+
+void ListDir(int parent_fd, Arena& arena, vector<char*>& entries) {
+  entries.clear();
+  int dir_fd = openat(parent_fd, dirname, O_NOATIME | O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  if (dir_fd < 0) return;
+  arena.Clear();
+  while (true) {
+    char* buf = arena.Alloc();
+    int n = syscall(SYS_getdents64, dir_fd, buf, Arena::kBlockSize - 256);                // +
+    if (n <= 0) {
+      if (n) entries.clear();
+      break;
+    }
+    for (int pos = 0; pos < n;) {
+      auto* ent = reinterpret_cast<dirent64_t*>(buf + pos);
+      if (!Dots(ent->d_name)) {
+        ByteSwap64(ent->d_name);                                                          // +
+        entries.push_back(ent->d_name);
+      }
+      pos += ent->d_reclen;
+    }
+  }
+  sort(entries.begin(), entries.end(), [](const char* a, const char* b) {
+    uint64_t x = Read64(a);                                                               // +
+    uint64_t y = Read64(b);                                                               // +
+    return x < y || (x == y && a != b && memcmp(a + 5, b + 5, 256) < 0);                  // +
+  });
+  for (char* p : entries) ByteSwap64(p);                                                  // +
+  close(dir_fd);
+}
+```
+
+This is for Little Endian architecture. Big Endian doesn't need `ByteSwap64()`, so it'll be a bit
+faster.
+
+| version | optimization                     |     score |
+|---------|----------------------------------|----------:|
+| v1      | baseline                         |     100.0 |
+| v2      | avoid heap allocations           |     112.7 |
+| v3      | open directories with `openat()` |     116.2 |
+| v4      | call `getdents64()` directly     |     137.8 |
+| **v5**  | **hand-optimize `strcmp()`**     | **143.3** |
+
+Fast and respectably arcane.
+
+## Conclusion
+
+Through a series of incremental improvements we've sped up directory listing by 43.3% compared to a
+naive implementation (v1) and 27.2% compared to a reasonable implementation that a seasoned C/C++
+practitioner might write (v2).
+
+However, these numbers are based on an artificial benchmark while the real judge is always the real
+code. Our goal was to speed up gitstatusd. Benchmark was just a tool. Thankfully, the different
+versions of `ListDir()` have the same comparative performance within gitstatusd as in the benchmark.
+In truth, the directory chosen for the benchmark wasn't arbitrary. It was picked by sampling
+gitstatusd when it runs on [chromium](https://github.com/chromium/chromium) git repository.
+
+The final version of `ListDir()` spends 97% of its CPU time in the kernel. If we assume that it
+makes the minimum possible number of system calls and these calls are optimal (true to the best
+of my knowledge), it puts the upper bound on possible future performance improvements at just 3%.
+There is almost nothing left in `ListDir()` to optimize.
+
+![ListDir() CPU profile](
+  https://raw.githubusercontent.com/romkatv/gitstatus/1ac366952366d89980b3f3484f270b4fa5ae4293/cpu-profile-listdir.png)
+
+(The CPU profile was created with [gperftools](https://github.com/gperftools/gperftools) and
+rendered with [pprof](https://github.com/google/pprof)).

gitstatus/gitstatus.plugin.sh

@@ -0,0 +1,474 @@
+# Bash bindings for gitstatus.
+
+[[ $- == *i* ]] || return  # non-interactive shell
+
+# Starts gitstatusd in the background. Does nothing and succeeds if gitstatusd
+# is already running.
+#
+# Usage: gitstatus_start [OPTION]...
+#
+#   -t FLOAT  Fail the self-check on initialization if not getting a response from
+#             gitstatusd for this this many seconds. Defaults to 5.
+#
+#   -s INT    Report at most this many staged changes; negative value means infinity.
+#             Defaults to 1.
+#
+#   -u INT    Report at most this many unstaged changes; negative value means infinity.
+#             Defaults to 1.
+#
+#   -c INT    Report at most this many conflicted changes; negative value means infinity.
+#             Defaults to 1.
+#
+#   -d INT    Report at most this many untracked files; negative value means infinity.
+#             Defaults to 1.
+#
+#   -m INT    Report -1 unstaged, untracked and conflicted if there are more than this many
+#             files in the index. Negative value means infinity. Defaults to -1.
+#
+#   -e        Count files within untracked directories like `git status --untracked-files`.
+#
+#   -U        Unless this option is specified, report zero untracked files for repositories
+#             with status.showUntrackedFiles = false.
+#
+#   -W        Unless this option is specified, report zero untracked files for repositories
+#             with bash.showUntrackedFiles = false.
+#
+#   -D        Unless this option is specified, report zero staged, unstaged and conflicted
+#             changes for repositories with bash.showDirtyState = false.
+#
+#   -r INT    Close git repositories that haven't been used for this many seconds. This is
+#             meant to release resources such as memory and file descriptors. The next request
+#             for a repo that's been closed is much slower than for a repo that hasn't been.
+#             Negative value means infinity. The default is 3600 (one hour).
+function gitstatus_start() {
+  if [[ "$BASH_VERSION" < 4 ]]; then
+    >&2 printf 'gitstatus_start: need bash version >= 4.0, found %s\n' "$BASH_VERSION"
+    >&2 printf '\n'
+    >&2 printf 'To see the version of the current shell, type:\n'
+    >&2 printf '\n'
+    >&2 printf '    \033[32mecho\033[0m \033[33m"$BASH_VERSION"\033[0m\n'
+    >&2 printf '\n'
+    >&2 printf 'The output of `\033[32mbash\033[0m --version` may be different and is not relevant.\n'
+    return 1
+  fi
+
+  unset OPTIND
+  local opt timeout=5 max_dirty=-1 ttl=3600 extra_flags=
+  local max_num_staged=1 max_num_unstaged=1 max_num_conflicted=1 max_num_untracked=1
+  while getopts "t:s:u:c:d:m:r:eUWD" opt; do
+    case "$opt" in
+      t) timeout=$OPTARG;;
+      s) max_num_staged=$OPTARG;;
+      u) max_num_unstaged=$OPTARG;;
+      c) max_num_conflicted=$OPTARG;;
+      d) max_num_untracked=$OPTARG;;
+      m) max_dirty=$OPTARG;;
+      r) ttl=$OPTARG;;
+      e) extra_flags+='--recurse-untracked-dirs ';;
+      U) extra_flags+='--ignore-status-show-untracked-files ';;
+      W) extra_flags+='--ignore-bash-show-untracked-files ';;
+      D) extra_flags+='--ignore-bash-show-dirty-state ';;
+      *) return 1;;
+    esac
+  done
+
+  (( OPTIND == $# + 1 )) || { echo "usage: gitstatus_start [OPTION]..." >&2; return 1; }
+
+  [[ -z "${GITSTATUS_DAEMON_PID:-}" ]] || return 0  # already started
+
+  if [[ "${BASH_SOURCE[0]}" == */* ]]; then
+    local gitstatus_plugin_dir="${BASH_SOURCE[0]%/*}"
+    if [[ "$gitstatus_plugin_dir" != /* ]]; then
+      gitstatus_plugin_dir="$PWD"/"$gitstatus_plugin_dir"
+    fi
+  else
+    local gitstatus_plugin_dir="$PWD"
+  fi
+
+  local tmpdir req_fifo resp_fifo culprit
+
+  function gitstatus_start_impl() {
+    local log_level="${GITSTATUS_LOG_LEVEL:-}"
+    [[ -n "$log_level" || "${GITSTATUS_ENABLE_LOGGING:-0}" != 1 ]] || log_level=INFO
+
+    local uname_sm
+    uname_sm="$(command uname -sm)" || return
+    uname_sm="${uname_sm,,}"
+    local uname_s="${uname_sm% *}"
+    local uname_m="${uname_sm#* }"
+
+    if [[ "${GITSTATUS_NUM_THREADS:-0}" -gt 0 ]]; then
+      local threads="$GITSTATUS_NUM_THREADS"
+    else
+      local cpus
+      if ! command -v sysctl &>/dev/null || [[ "$uname_s" == linux ]] ||
+         ! cpus="$(command sysctl -n hw.ncpu)"; then
+        if ! command -v getconf &>/dev/null || ! cpus="$(command getconf _NPROCESSORS_ONLN)"; then
+          cpus=8
+        fi
+      fi
+      local threads=$((cpus > 16 ? 32 : cpus > 0 ? 2 * cpus : 16))
+    fi
+
+    local daemon_args=(
+      --parent-pid="$$"
+      --num-threads="$threads"
+      --max-num-staged="$max_num_staged"
+      --max-num-unstaged="$max_num_unstaged"
+      --max-num-conflicted="$max_num_conflicted"
+      --max-num-untracked="$max_num_untracked"
+      --dirty-max-index-size="$max_dirty"
+      --repo-ttl-seconds="$ttl"
+      $extra_flags)
+
+    if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+      local tmpdir=$TMPDIR
+    else
+      local tmpdir=/tmp
+    fi
+    tmpdir="$(command mktemp -d "$tmpdir"/gitstatus.bash.$$.XXXXXXXXXX)" || return
+
+    if [[ -n "$log_level" ]]; then
+      GITSTATUS_DAEMON_LOG="$tmpdir"/daemon.log
+      [[ "$log_level" == INFO ]] || daemon_args+=(--log-level="$log_level")
+    else
+      GITSTATUS_DAEMON_LOG=/dev/null
+    fi
+
+    req_fifo="$tmpdir"/req.fifo
+    resp_fifo="$tmpdir"/resp.fifo
+    command mkfifo -- "$req_fifo" "$resp_fifo" || return
+
+    {
+      (
+        trap '' INT QUIT TSTP
+        [[ "$GITSTATUS_DAEMON_LOG" == /dev/null ]] || set -x
+        builtin cd /
+
+        (
+          local fd_in fd_out
+          exec {fd_in}<"$req_fifo" {fd_out}>>"$resp_fifo" || exit
+          echo "$BASHPID" >&"$fd_out"
+
+          local _gitstatus_bash_daemon _gitstatus_bash_version _gitstatus_bash_downloaded
+
+          function _gitstatus_set_daemon() {
+            _gitstatus_bash_daemon="$1"
+            _gitstatus_bash_version="$2"
+            _gitstatus_bash_downloaded="$3"
+          }
+
+          set -- -d "$gitstatus_plugin_dir" -s "$uname_s" -m "$uname_m" \
+            -p "printf '.\036' >&$fd_out" -e "$fd_out" -- _gitstatus_set_daemon
+          [[ "${GITSTATUS_AUTO_INSTALL:-1}" -ne 0 ]]  || set -- -n "$@"
+          source "$gitstatus_plugin_dir"/install      || return
+          [[ -n "$_gitstatus_bash_daemon" ]]          || return
+          [[ -n "$_gitstatus_bash_version" ]]         || return
+          [[ "$_gitstatus_bash_downloaded" == [01] ]] || return
+
+          local sig=(TERM ILL PIPE)
+
+          if (( UID == EUID )); then
+            local home=~
+          else
+            local user
+            user="$(command id -un)"            || return
+            [[ "$user" =~ ^[a-zA-Z0-9_,.-]+$ ]] || return
+            eval "local home=~$user"
+            [[ -n "$home" ]]                    || return
+          fi
+
+          if [[ -x "$_gitstatus_bash_daemon" ]]; then
+            HOME="$home" "$_gitstatus_bash_daemon" \
+              -G "$_gitstatus_bash_version" "${daemon_args[@]}" <&"$fd_in" >&"$fd_out" &
+            local pid=$!
+            trap "trap - ${sig[*]}; kill $pid &>/dev/null" ${sig[@]}
+            wait "$pid"
+            local ret=$?
+            trap - ${sig[@]}
+            case "$ret" in
+              0|129|130|131|137|141|143|159)
+                echo -nE $'}bye\x1f0\x1e' >&"$fd_out"
+                exit "$ret"
+              ;;
+            esac
+          fi
+
+          (( ! _gitstatus_bash_downloaded ))         || return
+          [[ "${GITSTATUS_AUTO_INSTALL:-1}" -ne 0 ]] || return
+          [[ "$_gitstatus_bash_daemon" == \
+             "${GITSTATUS_CACHE_DIR:-${XDG_CACHE_HOME:-$HOME/.cache}/gitstatus}"/* ]] || return
+
+          set -- -f "$@"
+          _gitstatus_bash_daemon=
+          _gitstatus_bash_version=
+          _gitstatus_bash_downloaded=
+          source "$gitstatus_plugin_dir"/install   || return
+          [[ -n "$_gitstatus_bash_daemon" ]]       || return
+          [[ -n "$_gitstatus_bash_version" ]]      || return
+          [[ "$_gitstatus_bash_downloaded" == 1 ]] || return
+
+          HOME="$home" "$_gitstatus_bash_daemon" \
+            -G "$_gitstatus_bash_version" "${daemon_args[@]}" <&"$fd_in" >&"$fd_out" &
+          local pid=$!
+          trap "trap - ${sig[*]}; kill $pid &>/dev/null" ${sig[@]}
+          wait "$pid"
+          trap - ${sig[@]}
+          echo -nE $'}bye\x1f0\x1e' >&"$fd_out"
+        ) & disown
+      ) & disown
+    } 0</dev/null &>"$GITSTATUS_DAEMON_LOG"
+
+    exec {_GITSTATUS_REQ_FD}>>"$req_fifo" {_GITSTATUS_RESP_FD}<"$resp_fifo"   || return
+    command rm -f -- "$req_fifo" "$resp_fifo"                                 || return
+    [[ "$GITSTATUS_DAEMON_LOG" != /dev/null ]] || command rmdir -- "$tmpdir" 2>/dev/null
+
+    IFS='' read -r -u $_GITSTATUS_RESP_FD GITSTATUS_DAEMON_PID || return
+    [[ "$GITSTATUS_DAEMON_PID" == [1-9]* ]] || return
+
+    local reply
+    echo -nE $'}hello\x1f\x1e' >&$_GITSTATUS_REQ_FD || return
+    local dl=
+    while true; do
+      reply=
+      if ! IFS='' read -rd $'\x1e' -u $_GITSTATUS_RESP_FD -t "$timeout" reply; then
+        culprit="$reply"
+        return 1
+      fi
+      [[ "$reply" == $'}hello\x1f0' ]] && break
+      if [[ -z "$dl" ]]; then
+        dl=1
+        if [[ -t 2 ]]; then
+          local spinner=('\b\033[33m-\033[0m' '\b\033[33m\\\033[0m' '\b\033[33m|\033[0m' '\b\033[33m/\033[0m')
+          >&2 printf '[\033[33mgitstatus\033[0m] fetching \033[32mgitstatusd\033[0m ..  '
+        else
+          local spinner=('.')
+          >&2 printf '[gitstatus] fetching gitstatusd ..'
+        fi
+      fi
+      >&2 printf "${spinner[0]}"
+      spinner=("${spinner[@]:1}" "${spinner[0]}")
+    done
+
+    if [[ -n "$dl" ]]; then
+      if [[ -t 2 ]]; then
+        >&2 printf '\b[\033[32mok\033[0m]\n'
+      else
+        >&2 echo ' [ok]'
+      fi
+    fi
+
+    _GITSTATUS_DIRTY_MAX_INDEX_SIZE=$max_dirty
+    _GITSTATUS_CLIENT_PID="$BASHPID"
+  }
+
+  if ! gitstatus_start_impl; then
+    >&2 printf '\n'
+    >&2 printf '[\033[31mERROR\033[0m]: gitstatus failed to initialize.\n'
+    if [[ -n "${culprit-}" ]]; then
+      >&2 printf '\n%s\n' "$culprit"
+    fi
+    [[ -z "${req_fifo:-}"  ]] || command rm -f "$req_fifo"
+    [[ -z "${resp_fifo:-}" ]] || command rm -f "$resp_fifo"
+    unset -f gitstatus_start_impl
+    gitstatus_stop
+    return 1
+  fi
+
+  export _GITSTATUS_CLIENT_PID _GITSTATUS_REQ_FD _GITSTATUS_RESP_FD GITSTATUS_DAEMON_PID
+  unset -f gitstatus_start_impl
+}
+
+# Stops gitstatusd if it's running.
+function gitstatus_stop() {
+  if [[ "${_GITSTATUS_CLIENT_PID:-$BASHPID}" == "$BASHPID" ]]; then
+    [[ -z "${_GITSTATUS_REQ_FD:-}"    ]] || exec {_GITSTATUS_REQ_FD}>&-              || true
+    [[ -z "${_GITSTATUS_RESP_FD:-}"   ]] || exec {_GITSTATUS_RESP_FD}>&-             || true
+    [[ -z "${GITSTATUS_DAEMON_PID:-}" ]] || kill "$GITSTATUS_DAEMON_PID" &>/dev/null || true
+  fi
+  unset _GITSTATUS_REQ_FD _GITSTATUS_RESP_FD GITSTATUS_DAEMON_PID
+  unset _GITSTATUS_DIRTY_MAX_INDEX_SIZE _GITSTATUS_CLIENT_PID
+}
+
+# Retrieves status of a git repository from a directory under its working tree.
+#
+# Usage: gitstatus_query [OPTION]...
+#
+#   -d STR    Directory to query. Defaults to $PWD. Has no effect if GIT_DIR is set.
+#   -t FLOAT  Timeout in seconds. Will block for at most this long. If no results
+#             are available by then, will return error.
+#   -p        Don't compute anything that requires reading Git index. If this option is used,
+#             the following parameters will be 0: VCS_STATUS_INDEX_SIZE,
+#             VCS_STATUS_{NUM,HAS}_{STAGED,UNSTAGED,UNTRACKED,CONFLICTED}.
+#
+# On success sets VCS_STATUS_RESULT to one of the following values:
+#
+#   norepo-sync  The directory doesn't belong to a git repository.
+#   ok-sync      The directory belongs to a git repository.
+#
+# If VCS_STATUS_RESULT is ok-sync, additional variables are set:
+#
+#   VCS_STATUS_WORKDIR              Git repo working directory. Not empty.
+#   VCS_STATUS_COMMIT               Commit hash that HEAD is pointing to. Either 40 hex digits or
+#                                   empty if there is no HEAD (empty repo).
+#   VCS_STATUS_COMMIT_ENCODING      Encoding of the HEAD's commit message. Empty value means UTF-8.
+#   VCS_STATUS_COMMIT_SUMMARY       The first paragraph of the HEAD's commit message as one line.
+#   VCS_STATUS_LOCAL_BRANCH         Local branch name or empty if not on a branch.
+#   VCS_STATUS_REMOTE_NAME          The remote name, e.g. "upstream" or "origin".
+#   VCS_STATUS_REMOTE_BRANCH        Upstream branch name. Can be empty.
+#   VCS_STATUS_REMOTE_URL           Remote URL. Can be empty.
+#   VCS_STATUS_ACTION               Repository state, A.K.A. action. Can be empty.
+#   VCS_STATUS_INDEX_SIZE           The number of files in the index.
+#   VCS_STATUS_NUM_STAGED           The number of staged changes.
+#   VCS_STATUS_NUM_CONFLICTED       The number of conflicted changes.
+#   VCS_STATUS_NUM_UNSTAGED         The number of unstaged changes.
+#   VCS_STATUS_NUM_UNTRACKED        The number of untracked files.
+#   VCS_STATUS_HAS_STAGED           1 if there are staged changes, 0 otherwise.
+#   VCS_STATUS_HAS_CONFLICTED       1 if there are conflicted changes, 0 otherwise.
+#   VCS_STATUS_HAS_UNSTAGED         1 if there are unstaged changes, 0 if there aren't, -1 if
+#                                   unknown.
+#   VCS_STATUS_NUM_STAGED_NEW       The number of staged new files. Note that renamed files
+#                                   are reported as deleted plus new.
+#   VCS_STATUS_NUM_STAGED_DELETED   The number of staged deleted files. Note that renamed files
+#                                   are reported as deleted plus new.
+#   VCS_STATUS_NUM_UNSTAGED_DELETED The number of unstaged deleted files. Note that renamed files
+#                                   are reported as deleted plus new.
+#   VCS_STATUS_HAS_UNTRACKED        1 if there are untracked files, 0 if there aren't, -1 if
+#                                   unknown.
+#   VCS_STATUS_COMMITS_AHEAD        Number of commits the current branch is ahead of upstream.
+#                                   Non-negative integer.
+#   VCS_STATUS_COMMITS_BEHIND       Number of commits the current branch is behind upstream.
+#                                   Non-negative integer.
+#   VCS_STATUS_STASHES              Number of stashes. Non-negative integer.
+#   VCS_STATUS_TAG                  The last tag (in lexicographical order) that points to the same
+#                                   commit as HEAD.
+#   VCS_STATUS_PUSH_REMOTE_NAME     The push remote name, e.g. "upstream" or "origin".
+#   VCS_STATUS_PUSH_REMOTE_URL      Push remote URL. Can be empty.
+#   VCS_STATUS_PUSH_COMMITS_AHEAD   Number of commits the current branch is ahead of push remote.
+#                                   Non-negative integer.
+#   VCS_STATUS_PUSH_COMMITS_BEHIND  Number of commits the current branch is behind push remote.
+#                                   Non-negative integer.
+#   VCS_STATUS_NUM_SKIP_WORKTREE    The number of files in the index with skip-worktree bit set.
+#                                   Non-negative integer.
+#   VCS_STATUS_NUM_ASSUME_UNCHANGED The number of files in the index with assume-unchanged bit set.
+#                                   Non-negative integer.
+#
+# The point of reporting -1 via VCS_STATUS_HAS_* is to allow the command to skip scanning files in
+# large repos. See -m flag of gitstatus_start.
+#
+# gitstatus_query returns an error if gitstatus_start hasn't been called in the same
+# shell or the call had failed.
+function gitstatus_query() {
+  unset OPTIND
+  local opt dir= timeout=() no_diff=0
+  while getopts "d:c:t:p" opt "$@"; do
+    case "$opt" in
+      d) dir=$OPTARG;;
+      t) timeout=(-t "$OPTARG");;
+      p) no_diff=1;;
+      *) return 1;;
+    esac
+  done
+  (( OPTIND == $# + 1 )) || { echo "usage: gitstatus_query [OPTION]..." >&2; return 1; }
+
+  [[ -n "${GITSTATUS_DAEMON_PID-}" ]] || return  # not started
+
+  local req_id="$RANDOM.$RANDOM.$RANDOM.$RANDOM"
+  if [[ -z "${GIT_DIR:-}" ]]; then
+    [[ "$dir" == /* ]] || dir="$(pwd -P)/$dir" || return
+  elif [[ "$GIT_DIR" == /* ]]; then
+    dir=:"$GIT_DIR"
+  else
+    dir=:"$(pwd -P)/$GIT_DIR" || return
+  fi
+  echo -nE "$req_id"$'\x1f'"$dir"$'\x1f'"$no_diff"$'\x1e' >&$_GITSTATUS_REQ_FD || return
+
+  local -a resp
+  while true; do
+    IFS=$'\x1f' read -rd $'\x1e' -a resp -u $_GITSTATUS_RESP_FD "${timeout[@]}" || return
+    [[ "${resp[0]}" == "$req_id" ]] && break
+  done
+
+  if [[ "${resp[1]}" == 1 ]]; then
+    VCS_STATUS_RESULT=ok-sync
+    VCS_STATUS_WORKDIR="${resp[2]}"
+    VCS_STATUS_COMMIT="${resp[3]}"
+    VCS_STATUS_LOCAL_BRANCH="${resp[4]}"
+    VCS_STATUS_REMOTE_BRANCH="${resp[5]}"
+    VCS_STATUS_REMOTE_NAME="${resp[6]}"
+    VCS_STATUS_REMOTE_URL="${resp[7]}"
+    VCS_STATUS_ACTION="${resp[8]}"
+    VCS_STATUS_INDEX_SIZE="${resp[9]}"
+    VCS_STATUS_NUM_STAGED="${resp[10]}"
+    VCS_STATUS_NUM_UNSTAGED="${resp[11]}"
+    VCS_STATUS_NUM_CONFLICTED="${resp[12]}"
+    VCS_STATUS_NUM_UNTRACKED="${resp[13]}"
+    VCS_STATUS_COMMITS_AHEAD="${resp[14]}"
+    VCS_STATUS_COMMITS_BEHIND="${resp[15]}"
+    VCS_STATUS_STASHES="${resp[16]}"
+    VCS_STATUS_TAG="${resp[17]}"
+    VCS_STATUS_NUM_UNSTAGED_DELETED="${resp[18]}"
+    VCS_STATUS_NUM_STAGED_NEW="${resp[19]:-0}"
+    VCS_STATUS_NUM_STAGED_DELETED="${resp[20]:-0}"
+    VCS_STATUS_PUSH_REMOTE_NAME="${resp[21]:-}"
+    VCS_STATUS_PUSH_REMOTE_URL="${resp[22]:-}"
+    VCS_STATUS_PUSH_COMMITS_AHEAD="${resp[23]:-0}"
+    VCS_STATUS_PUSH_COMMITS_BEHIND="${resp[24]:-0}"
+    VCS_STATUS_NUM_SKIP_WORKTREE="${resp[25]:-0}"
+    VCS_STATUS_NUM_ASSUME_UNCHANGED="${resp[26]:-0}"
+    VCS_STATUS_COMMIT_ENCODING="${resp[27]-}"
+    VCS_STATUS_COMMIT_SUMMARY="${resp[28]-}"
+    VCS_STATUS_HAS_STAGED=$((VCS_STATUS_NUM_STAGED > 0))
+    if (( _GITSTATUS_DIRTY_MAX_INDEX_SIZE >= 0 &&
+          VCS_STATUS_INDEX_SIZE > _GITSTATUS_DIRTY_MAX_INDEX_SIZE_ )); then
+      VCS_STATUS_HAS_UNSTAGED=-1
+      VCS_STATUS_HAS_CONFLICTED=-1
+      VCS_STATUS_HAS_UNTRACKED=-1
+    else
+      VCS_STATUS_HAS_UNSTAGED=$((VCS_STATUS_NUM_UNSTAGED > 0))
+      VCS_STATUS_HAS_CONFLICTED=$((VCS_STATUS_NUM_CONFLICTED > 0))
+      VCS_STATUS_HAS_UNTRACKED=$((VCS_STATUS_NUM_UNTRACKED > 0))
+    fi
+  else
+    VCS_STATUS_RESULT=norepo-sync
+    unset VCS_STATUS_WORKDIR
+    unset VCS_STATUS_COMMIT
+    unset VCS_STATUS_LOCAL_BRANCH
+    unset VCS_STATUS_REMOTE_BRANCH
+    unset VCS_STATUS_REMOTE_NAME
+    unset VCS_STATUS_REMOTE_URL
+    unset VCS_STATUS_ACTION
+    unset VCS_STATUS_INDEX_SIZE
+    unset VCS_STATUS_NUM_STAGED
+    unset VCS_STATUS_NUM_UNSTAGED
+    unset VCS_STATUS_NUM_CONFLICTED
+    unset VCS_STATUS_NUM_UNTRACKED
+    unset VCS_STATUS_HAS_STAGED
+    unset VCS_STATUS_HAS_UNSTAGED
+    unset VCS_STATUS_HAS_CONFLICTED
+    unset VCS_STATUS_HAS_UNTRACKED
+    unset VCS_STATUS_COMMITS_AHEAD
+    unset VCS_STATUS_COMMITS_BEHIND
+    unset VCS_STATUS_STASHES
+    unset VCS_STATUS_TAG
+    unset VCS_STATUS_NUM_UNSTAGED_DELETED
+    unset VCS_STATUS_NUM_STAGED_NEW
+    unset VCS_STATUS_NUM_STAGED_DELETED
+    unset VCS_STATUS_PUSH_REMOTE_NAME
+    unset VCS_STATUS_PUSH_REMOTE_URL
+    unset VCS_STATUS_PUSH_COMMITS_AHEAD
+    unset VCS_STATUS_PUSH_COMMITS_BEHIND
+    unset VCS_STATUS_NUM_SKIP_WORKTREE
+    unset VCS_STATUS_NUM_ASSUME_UNCHANGED
+    unset VCS_STATUS_COMMIT_ENCODING
+    unset VCS_STATUS_COMMIT_SUMMARY
+  fi
+}
+
+# Usage: gitstatus_check.
+#
+# Returns 0 if and only if gitstatus_start has succeeded previously.
+# If it returns non-zero, gitstatus_query is guaranteed to return non-zero.
+function gitstatus_check() {
+  [[ -n "$GITSTATUS_DAEMON_PID" ]]
+}

gitstatus/gitstatus.plugin.zsh

@@ -15,6 +15,8 @@
 #   VCS_STATUS_COMMIT=c000eddcff0fb38df2d0137efe24d9d2d900f209
 #   VCS_STATUS_COMMITS_AHEAD=0
 #   VCS_STATUS_COMMITS_BEHIND=0
+#   VCS_STATUS_COMMIT_ENCODING=''
+#   VCS_STATUS_COMMIT_SUMMARY='pull upstream changes from gitstatus'
 #   VCS_STATUS_HAS_CONFLICTED=0
 #   VCS_STATUS_HAS_STAGED=0
 #   VCS_STATUS_HAS_UNSTAGED=1
@@ -55,9 +57,9 @@ autoload -Uz add-zsh-hook        || return
 zmodload zsh/datetime zsh/system || return
 zmodload -F zsh/files b:zf_rm    || return
 
-typeset -g _gitstatus_plugin_dir=${${(%):-%x}:A:h}
+typeset -g _gitstatus_plugin_dir"${1:-}"="${${(%):-%x}:A:h}"
 
-# Retrives status of a git repo from a directory under its working tree.
+# Retrieves status of a git repo from a directory under its working tree.
 #
 ## Usage: gitstatus_query [OPTION]... NAME
 #
@@ -88,6 +90,8 @@ typeset -g _gitstatus_plugin_dir=${${(%):-%x}:A:h}
 #   VCS_STATUS_WORKDIR              Git repo working directory. Not empty.
 #   VCS_STATUS_COMMIT               Commit hash that HEAD is pointing to. Either 40 hex digits or
 #                                   empty if there is no HEAD (empty repo).
+#   VCS_STATUS_COMMIT_ENCODING      Encoding of the HEAD's commit message. Empty value means UTF-8.
+#   VCS_STATUS_COMMIT_SUMMARY       The first paragraph of the HEAD's commit message as one line.
 #   VCS_STATUS_LOCAL_BRANCH         Local branch name or empty if not on a branch.
 #   VCS_STATUS_REMOTE_NAME          The remote name, e.g. "upstream" or "origin".
 #   VCS_STATUS_REMOTE_BRANCH        Upstream branch name. Can be empty.
@@ -138,9 +142,11 @@ typeset -g _gitstatus_plugin_dir=${${(%):-%x}:A:h}
 #
 # It's illegal to call gitstatus_query if the last asynchronous call with the same NAME hasn't
 # completed yet. If you need to issue concurrent requests, use different NAME arguments.
-function gitstatus_query() {
+function gitstatus_query"${1:-}"() {
   emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
 
+  local fsuf=${${(%):-%N}#gitstatus_query}
+
   unset VCS_STATUS_RESULT
 
   local opt dir callback OPTARG
@@ -166,22 +172,40 @@ function gitstatus_query() {
   done
 
   if (( OPTIND != ARGC )); then
-    print -ru2 -- "gitstatus_start: exactly one positional argument is required"
+    print -ru2 -- "gitstatus_query: exactly one positional argument is required"
     return 1
   fi
 
   local name=$*[OPTIND]
   if [[ $name != [[:IDENT:]]## ]]; then
-    print -ru2 -- "gitstatus_start: invalid positional argument: $name"
+    print -ru2 -- "gitstatus_query: invalid positional argument: $name"
     return 1
   fi
 
   (( _GITSTATUS_STATE_$name == 2 )) || return
 
   if [[ -z $GIT_DIR ]]; then
-    [[ $dir == /* ]] || dir=${(%):-%/}/$dir
+    if [[ $dir != /* ]]; then
+      if [[ $PWD == /* && $PWD -ef . ]]; then
+        dir=$PWD/$dir
+      else
+        dir=${dir:a}
+      fi
+    fi
   else
-    [[ $GIT_DIR == /* ]] && dir=:$GIT_DIR || dir=:${(%):-%/}/$GIT_DIR
+    if [[ $GIT_DIR == /* ]]; then
+      dir=:$GIT_DIR
+    elif [[ $PWD == /* && $PWD -ef . ]]; then
+      dir=:$PWD/$GIT_DIR
+    else
+      dir=:${GIT_DIR:a}
+    fi
+  fi
+
+  if [[ $dir != (|:)/* ]]; then
+    typeset -g VCS_STATUS_RESULT=norepo-sync
+    _gitstatus_clear$fsuf
+    return 0
   fi
 
   local -i req_fd=${(P)${:-_GITSTATUS_REQ_FD_$name}}
@@ -192,10 +216,10 @@ function gitstatus_query() {
 
   if (( timeout == 0 )); then
     typeset -g VCS_STATUS_RESULT=tout
-    _gitstatus_clear
+    _gitstatus_clear$fsuf
   else
     while true; do
-      _gitstatus_process_response $name $timeout $req_id || return
+      _gitstatus_process_response$fsuf $name $timeout $req_id || return
       [[ $VCS_STATUS_RESULT == *-async ]] || break
     done
   fi
@@ -215,8 +239,11 @@ function gitstatus_query() {
 #
 # If a callback gets called, VCS_STATUS_* parameters are set as in gitstatus_query.
 # VCS_STATUS_RESULT is either norepo-async or ok-async.
-function gitstatus_process_results() {
+function gitstatus_process_results"${1:-}"() {
   emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
+
+  local fsuf=${${(%):-%N}#gitstatus_process_results}
+
   local opt OPTARG
   local -i OPTIND
   local -F timeout=-1
@@ -249,18 +276,18 @@ function gitstatus_process_results() {
   (( _GITSTATUS_STATE_$name == 2 )) || return
 
   while (( _GITSTATUS_NUM_INFLIGHT_$name )); do
-    _gitstatus_process_response $name $timeout '' || return
+    _gitstatus_process_response$fsuf $name $timeout '' || return
     [[ $VCS_STATUS_RESULT == *-async ]] || break
   done
 
   return 0
 }
 
-function _gitstatus_clear() {
+function _gitstatus_clear"${1:-}"() {
   unset VCS_STATUS_{WORKDIR,COMMIT,LOCAL_BRANCH,REMOTE_BRANCH,REMOTE_NAME,REMOTE_URL,ACTION,INDEX_SIZE,NUM_STAGED,NUM_UNSTAGED,NUM_CONFLICTED,NUM_UNTRACKED,HAS_STAGED,HAS_UNSTAGED,HAS_CONFLICTED,HAS_UNTRACKED,COMMITS_AHEAD,COMMITS_BEHIND,STASHES,TAG,NUM_UNSTAGED_DELETED,NUM_STAGED_NEW,NUM_STAGED_DELETED,PUSH_REMOTE_NAME,PUSH_REMOTE_URL,PUSH_COMMITS_AHEAD,PUSH_COMMITS_BEHIND,NUM_SKIP_WORKTREE,NUM_ASSUME_UNCHANGED}
 }
 
-function _gitstatus_process_response() {
+function _gitstatus_process_response"${1:-}"() {
   local name=$1 timeout req_id=$3 buf
   local -i resp_fd=_GITSTATUS_RESP_FD_$name
   local -i dirty_max_index_size=_GITSTATUS_DIRTY_MAX_INDEX_SIZE_$name
@@ -270,17 +297,17 @@ function _gitstatus_process_response() {
     if (( $? == 4 )); then
       if [[ -n $req_id ]]; then
         typeset -g VCS_STATUS_RESULT=tout
-        _gitstatus_clear
+        _gitstatus_clear$fsuf
       fi
       return 0
     else
-      gitstatus_stop $name
+      gitstatus_stop$fsuf $name
       return 1
     fi
   }
   while [[ $buf != *$'\x1e' ]]; do
     if ! sysread -i $resp_fd 'buf[$#buf+1]'; then
-      gitstatus_stop $name
+      gitstatus_stop$fsuf $name
       return 1
     fi
   done
@@ -318,7 +345,9 @@ function _gitstatus_process_response() {
           VCS_STATUS_PUSH_COMMITS_AHEAD   \
           VCS_STATUS_PUSH_COMMITS_BEHIND  \
           VCS_STATUS_NUM_SKIP_WORKTREE    \
-          VCS_STATUS_NUM_ASSUME_UNCHANGED in "${(@)resp[3,27]}"; do
+          VCS_STATUS_NUM_ASSUME_UNCHANGED \
+          VCS_STATUS_COMMIT_ENCODING      \
+          VCS_STATUS_COMMIT_SUMMARY in "${(@)resp[3,29]}"; do
       done
       typeset -gi VCS_STATUS_{INDEX_SIZE,NUM_STAGED,NUM_UNSTAGED,NUM_CONFLICTED,NUM_UNTRACKED,COMMITS_AHEAD,COMMITS_BEHIND,STASHES,NUM_UNSTAGED_DELETED,NUM_STAGED_NEW,NUM_STAGED_DELETED,PUSH_COMMITS_AHEAD,PUSH_COMMITS_BEHIND,NUM_SKIP_WORKTREE,NUM_ASSUME_UNCHANGED}
       typeset -gi VCS_STATUS_HAS_STAGED=$((VCS_STATUS_NUM_STAGED > 0))
@@ -339,7 +368,7 @@ function _gitstatus_process_response() {
       else
         typeset -g VCS_STATUS_RESULT=norepo-async
       fi
-      _gitstatus_clear
+      _gitstatus_clear$fsuf
     fi
     (( --_GITSTATUS_NUM_INFLIGHT_$name ))
     [[ $VCS_STATUS_RESULT == *-async ]] && emulate zsh -c "${resp[1]#* }"
@@ -348,6 +377,110 @@ function _gitstatus_process_response() {
   return 0
 }
 
+function _gitstatus_daemon"${1:-}"() {
+  local -i pipe_fd
+  exec 0<&- {pipe_fd}>&1 1>>$daemon_log 2>&1 || return
+  local pgid=$sysparams[pid]
+  [[ $pgid == <1-> ]] || return
+  builtin cd -q /     || return
+
+  {
+    {
+      trap '' PIPE
+
+      local uname_sm
+      uname_sm="${${(L)$(command uname -sm)}//ı/i}" || return
+      [[ $uname_sm == [^' ']##' '[^' ']## ]]        || return
+      local uname_s=${uname_sm% *}
+      local uname_m=${uname_sm#* }
+
+      if [[ $GITSTATUS_NUM_THREADS == <1-> ]]; then
+        args+=(-t $GITSTATUS_NUM_THREADS)
+      else
+        local cpus
+        if (( ! $+commands[sysctl] )) || [[ $uname_s == linux ]] ||
+            ! cpus="$(command sysctl -n hw.ncpu)"; then
+          if (( ! $+commands[getconf] )) || ! cpus="$(command getconf _NPROCESSORS_ONLN)"; then
+            cpus=8
+          fi
+        fi
+        args+=(-t $((cpus > 16 ? 32 : cpus > 0 ? 2 * cpus : 16)))
+      fi
+
+      command mkfifo -- $file_prefix.fifo   || return
+      print -rnu $pipe_fd -- ${(l:20:)pgid} || return
+      exec <$file_prefix.fifo               || return
+      zf_rm -- $file_prefix.fifo            || return
+
+      local _gitstatus_zsh_daemon _gitstatus_zsh_version _gitstatus_zsh_downloaded
+
+      function _gitstatus_set_daemon$fsuf() {
+        _gitstatus_zsh_daemon="$1"
+        _gitstatus_zsh_version="$2"
+        _gitstatus_zsh_downloaded="$3"
+      }
+
+      local gitstatus_plugin_dir_var=_gitstatus_plugin_dir$fsuf
+      local gitstatus_plugin_dir=${(P)gitstatus_plugin_dir_var}
+      builtin set -- -d $gitstatus_plugin_dir -s $uname_s -m $uname_m \
+        -p "printf '\\001' >&$pipe_fd" -e $pipe_fd -- _gitstatus_set_daemon$fsuf
+      [[ ${GITSTATUS_AUTO_INSTALL:-1} == (|-|+)<1-> ]] || builtin set -- -n "$@"
+      builtin source $gitstatus_plugin_dir/install     || return
+      [[ -n $_gitstatus_zsh_daemon ]]                  || return
+      [[ -n $_gitstatus_zsh_version ]]                 || return
+      [[ $_gitstatus_zsh_downloaded == [01] ]]         || return
+
+      if (( UID == EUID )); then
+        local home=~
+      else
+        local user
+        user="$(command id -un)" || return
+        local home=${userdirs[$user]}
+        [[ -n $home ]] || return
+      fi
+
+      if [[ -x $_gitstatus_zsh_daemon ]]; then
+        HOME=$home $_gitstatus_zsh_daemon -G $_gitstatus_zsh_version "${(@)args}" >&$pipe_fd
+        local -i ret=$?
+        [[ $ret == (0|129|130|131|137|141|143|159) ]] && return ret
+      fi
+
+      (( ! _gitstatus_zsh_downloaded ))                || return
+      [[ ${GITSTATUS_AUTO_INSTALL:-1} == (|-|+)<1-> ]] || return
+      [[ $_gitstatus_zsh_daemon == \
+         ${GITSTATUS_CACHE_DIR:-${XDG_CACHE_HOME:-$HOME/.cache}/gitstatus}/* ]] || return
+
+      builtin set -- -f "$@"
+      _gitstatus_zsh_daemon=
+      _gitstatus_zsh_version=
+      _gitstatus_zsh_downloaded=
+      builtin source $gitstatus_plugin_dir/install || return
+      [[ -n $_gitstatus_zsh_daemon ]]              || return
+      [[ -n $_gitstatus_zsh_version ]]             || return
+      [[ $_gitstatus_zsh_downloaded == 1 ]]        || return
+
+      HOME=$home $_gitstatus_zsh_daemon -G $_gitstatus_zsh_version "${(@)args}" >&$pipe_fd
+    } always {
+      local -i ret=$?
+      zf_rm -f -- $file_prefix.lock $file_prefix.fifo
+      kill -- -$pgid
+    }
+  } &
+
+  pid_gitstatus=$!
+
+  (( lock_fd == -1 )) && return
+
+  {
+    if zsystem flock -- $file_prefix.lock && command sleep 5 && [[ -e $file_prefix.lock ]]; then
+      zf_rm -f -- $file_prefix.lock $file_prefix.fifo
+      kill -- -$pgid
+    fi
+  } &
+
+  wait $pid_gitstatus
+}
+
 # Starts gitstatusd in the background. Does nothing and succeeds if gitstatusd is already running.
 #
 # Usage: gitstatus_start [OPTION]... NAME
@@ -380,12 +513,12 @@ function _gitstatus_process_response() {
 #
 #   -D        Unless this option is specified, report zero staged, unstaged and conflicted
 #             changes for repositories with bash.showDirtyState = false.
-function gitstatus_start() {
-  emulate -L zsh || return
-  setopt no_aliases no_bg_nice extended_glob typeset_silent monitor || return
-
+function gitstatus_start"${1:-}"() {
+  emulate -L zsh -o no_aliases -o no_bg_nice -o extended_glob -o typeset_silent || return
   print -rnu2 || return
 
+  local fsuf=${${(%):-%N}#gitstatus_start}
+
   local opt OPTARG
   local -i OPTIND
   local -F timeout=5
@@ -411,7 +544,7 @@ function gitstatus_start() {
         args+=(-$opt $OPTARG)
         [[ $opt == m ]] && dirty_max_index_size=OPTARG
       ;;
-      e|U|W|D)    args+=$opt;;
+      e|U|W|D)    args+=-$opt;;
       +(e|U|W|D)) args=(${(@)args:#-$opt});;
       \?) print -ru2 -- "gitstatus_start: invalid option: $OPTARG"           ; return 1;;
       :)  print -ru2 -- "gitstatus_start: missing required argument: $OPTARG"; return 1;;
@@ -431,264 +564,274 @@ function gitstatus_start() {
   fi
 
   local -i lock_fd resp_fd stderr_fd
-  local file_prefix xtrace=/dev/null daemon_log=/dev/null
-  if (( _GITSTATUS_STATE_$name )); then
-    (( async )) && return
-    (( _GITSTATUS_STATE_$name == 2 )) && return
-    lock_fd=_GITSTATUS_LOCK_FD_$name
-    resp_fd=_GITSTATUS_RESP_FD_$name
-    xtrace=${(P)${:-GITSTATUS_XTRACE_$name}}
-    daemon_log=${(P)${:-GITSTATUS_DAEMON_LOG_$name}}
-    file_prefix=${(P)${:-_GITSTATUS_FILE_PREFIX_$name}}
-  else
-    local log_level=$GITSTATUS_LOG_LEVEL
-    local file_prefix=${${TMPDIR:-/tmp}:A}/gitstatus.$EUID.$sysparams[pid].$EPOCHSECONDS
-    (( GITSTATUS_ENABLE_LOGGING )) && : ${log_level:=INFO}
-    if [[ -n $log_level ]]; then
-      xtrace=$file_prefix.xtrace.log
-      daemon_log=$file_prefix.daemon.log
-    fi
-    args+=(-v ${log_level:-FATAL})
-    typeset -g GITSTATUS_XTRACE_$name=$xtrace
-    typeset -g GITSTATUS_DAEMON_LOG_$name=$daemon_log
-    typeset -g _GITSTATUS_FILE_PREFIX_$name=$file_prefix
-    typeset -gi _GITSTATUS_CLIENT_PID_$name="sysparams[pid]"
-    typeset -gi _GITSTATUS_DIRTY_MAX_INDEX_SIZE_$name=dirty_max_index_size
-  fi
+  local file_prefix xtrace=/dev/null daemon_log=/dev/null culprit
 
-  () {
-    if [[ $xtrace != /dev/null && -o no_xtrace ]]; then
-      exec {stderr_fd}>&2 || return
-      exec 2>>$xtrace     || return
-      setopt xtrace
-    fi
-
-    if (( ! _GITSTATUS_STATE_$name )); then
-      if [[ -r /proc/version && "$(</proc/version)" == *Microsoft* ]]; then
-        lock_fd=-1
+  {
+    if (( _GITSTATUS_STATE_$name )); then
+      (( async )) && return
+      (( _GITSTATUS_STATE_$name == 2 )) && return
+      lock_fd=_GITSTATUS_LOCK_FD_$name
+      resp_fd=_GITSTATUS_RESP_FD_$name
+      xtrace=${(P)${:-GITSTATUS_XTRACE_$name}}
+      daemon_log=${(P)${:-GITSTATUS_DAEMON_LOG_$name}}
+      file_prefix=${(P)${:-_GITSTATUS_FILE_PREFIX_$name}}
+    else
+      typeset -gi _GITSTATUS_START_COUNTER
+      local log_level=$GITSTATUS_LOG_LEVEL
+      if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+        local tmpdir=$TMPDIR
       else
-        print -rn >$file_prefix.lock               || return
-        zsystem flock -f lock_fd $file_prefix.lock || return
-        [[ $lock_fd == <1-> ]]                     || return
+        local tmpdir=/tmp
       fi
-      typeset -gi _GITSTATUS_LOCK_FD_$name=lock_fd
-
-      {
-        () {
-          typeset -gi GITSTATUS_DAEMON_PID_$name="${sysparams[procsubstpid]:--1}"
-          sysopen -r -o cloexec -u resp_fd -- $1 || return
-          [[ $resp_fd == <1-> ]]                 || return
-          typeset -gi _GITSTATUS_RESP_FD_$name=resp_fd
-        } <(
-          exec 2>&3 3>&-      || return
-          local pgid=$sysparams[pid]
-          [[ $pgid == <1-> ]] || return
-
-          {
-            {
-              trap '' PIPE
-
-              if [[ -z $GITSTATUS_DAEMON || $GITSTATUS_NUM_THREADS != <1-> ]]; then
-                local kernel
-                kernel="${(L)$(uname -s)}" || return
-                [[ -n $kernel ]]           || return
-              fi
-
-              if [[ $GITSTATUS_DAEMON == /* ]]; then
-                local daemons=($GITSTATUS_DAEMON)
-              elif (( $+commands[$GITSTATUS_DAEMON] )); then
-                local daemons=($commands[$GITSTATUS_DAEMON])
-              elif [[ -n $GITSTATUS_DAEMON ]]; then
-                local daemons=($_gitstatus_plugin_dir/{usrbin,bin}/$GITSTATUS_DAEMON)
-              else
-                local os
-                case $kernel in
-                  linux)
-                    os="${(L)$(uname -o)}" || return
-                    [[ -n $os ]]           || return
-                    [[ $os == android ]]   || os=linux
-                  ;;
-                  cygwin_nt-*)  os=cygwin_nt-10.0;;
-                  mingw|msys)   os=msys_nt-10.0;;
-                  *)            os=$kernel;;
-                esac
-                local arch
-                arch="${(L)$(uname -m)}" || return
-                [[ -n $arch ]]           || return
-                local daemons=($_gitstatus_plugin_dir/{usrbin,bin}/gitstatusd-$os-$arch{,-static})
-              fi
-
-              daemons=(${^daemons}(N:A))
-              daemons=(${^daemons}(N*))
-              (( $#daemons )) || return
-
-              if [[ $GITSTATUS_NUM_THREADS == <1-> ]]; then
-                args+=(-t $GITSTATUS_NUM_THREADS)
-              else
-                local cpus
-                if (( ! $+commands[sysctl] )) || [[ $kernel == linux ]] ||
-                   ! cpus="$(sysctl -n hw.ncpu)"; then
-                  if (( ! $+commands[getconf] )) || ! cpus="$(getconf _NPROCESSORS_ONLN)"; then
-                    cpus=8
-                  fi
-                fi
-                args+=(-t $((cpus > 16 ? 32 : cpus > 0 ? 2 * cpus : 16)))
-              fi
-
-              mkfifo -- $file_prefix.fifo || return
-              print -rn -- ${(l:20:)pgid} || return
-              exec <$file_prefix.fifo     || return
-              zf_rm -- $file_prefix.fifo  || return
-
-              local daemon
-              for daemon in $daemons; do
-                $daemon "${(@)args}"
-                local -i ret=$?
-                (( ret == 0 || ret == 10 || ret > 128 )) && return ret
-              done
-            } always {
-              local -i ret=$?
-              kill -- -$pgid
-            }
-          } &!
-
-          (( lock_fd == -1 )) && return
-
-          {
-            if zsystem flock -- $file_prefix.lock && [[ -e $file_prefix.lock ]]; then
-              zf_rm -f -- $file_prefix.lock $file_prefix.fifo
-              kill -- -$pgid
-            fi
-          } &!
-        ) || return
-      } 3>>$daemon_log </dev/null >/dev/null || return
-
-      typeset -gi _GITSTATUS_STATE_$name=1
+      local file_prefix=${tmpdir:A}/gitstatus.$name.$EUID
+      file_prefix+=.$sysparams[pid].$EPOCHSECONDS.$((++_GITSTATUS_START_COUNTER))
+      (( GITSTATUS_ENABLE_LOGGING )) && : ${log_level:=INFO}
+      if [[ -n $log_level ]]; then
+        xtrace=$file_prefix.xtrace.log
+        daemon_log=$file_prefix.daemon.log
+      fi
+      args+=(-v ${log_level:-FATAL})
+      typeset -g GITSTATUS_XTRACE_$name=$xtrace
+      typeset -g GITSTATUS_DAEMON_LOG_$name=$daemon_log
+      typeset -g _GITSTATUS_FILE_PREFIX_$name=$file_prefix
+      typeset -gi _GITSTATUS_CLIENT_PID_$name="sysparams[pid]"
+      typeset -gi _GITSTATUS_DIRTY_MAX_INDEX_SIZE_$name=dirty_max_index_size
     fi
 
-    if (( ! async )); then
-      (( _GITSTATUS_CLIENT_PID_$name == sysparams[pid] )) || return
+    () {
+      if [[ $xtrace != /dev/null && -o no_xtrace ]]; then
+        exec {stderr_fd}>&2 || return
+        exec 2>>$xtrace     || return
+        setopt xtrace
+      fi
 
-      local pgid
-      while (( $#pgid < 20 )); do
-        [[ -t $resp_fd ]]
-        sysread -s $((20 - $#pgid)) -t $timeout -i $resp_fd 'pgid[$#pgid+1]' || return
-      done
-      [[ $pgid == ' '#<1-> ]] || return
-      typeset -gi GITSTATUS_DAEMON_PID_$name=pgid
+      setopt monitor || return
 
-      sysopen -w -o cloexec -u req_fd -- $file_prefix.fifo || return
-      [[ $req_fd == <1-> ]]                                || return
-      typeset -gi _GITSTATUS_REQ_FD_$name=req_fd
-
-      function _gitstatus_process_response_$name() {
-        emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
-        local name=${${(%):-%N}#_gitstatus_process_response_}
-        if (( ARGC == 1 )); then
-          _gitstatus_process_response $name 0 ''
+      if (( ! _GITSTATUS_STATE_$name )); then
+        if [[ -r /proc/version && "$(</proc/version)" == *Microsoft* ]]; then
+          lock_fd=-1
         else
-          gitstatus_stop $name
+          print -rn >$file_prefix.lock               || return
+          zsystem flock -f lock_fd $file_prefix.lock || return
+          [[ $lock_fd == <1-> ]]                     || return
         fi
-      }
-      if ! zle -F $resp_fd _gitstatus_process_response_$name; then
-        unfunction _gitstatus_process_response_$name
-        return 1
+
+        typeset -gi _GITSTATUS_LOCK_FD_$name=lock_fd
+
+        if [[ $OSTYPE == cygwin* && -d /proc/self/fd ]]; then
+          # Work around bugs in Cygwin 32-bit.
+          #
+          # This hangs:
+          #
+          #   emulate -L zsh
+          #   () { exec {fd}< $1 } <(:)
+          #   =true  # hangs here
+          #
+          # This hangs:
+          #
+          #   sysopen -r -u fd <(:)
+          local -i fd
+          exec {fd}< <(_gitstatus_daemon$fsuf)                       || return
+          {
+            [[ -r /proc/self/fd/$fd ]]                               || return
+            sysopen -r -o cloexec -u resp_fd /proc/self/fd/$fd       || return
+          } always {
+            exec {fd} >&-                                            || return
+          }
+        else
+          sysopen -r -o cloexec -u resp_fd <(_gitstatus_daemon$fsuf) || return
+        fi
+
+        typeset -gi GITSTATUS_DAEMON_PID_$name="${sysparams[procsubstpid]:--1}"
+
+        [[ $resp_fd == <1-> ]] || return
+        typeset -gi _GITSTATUS_RESP_FD_$name=resp_fd
+        typeset -gi _GITSTATUS_STATE_$name=1
       fi
 
-      function _gitstatus_cleanup_$name() {
-        emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
-        local name=${${(%):-%N}#_gitstatus_cleanup_}
+      if (( ! async )); then
         (( _GITSTATUS_CLIENT_PID_$name == sysparams[pid] )) || return
-        gitstatus_stop $name
-      }
-      if ! add-zsh-hook zshexit _gitstatus_cleanup_$name; then
-        unfunction _gitstatus_cleanup_$name
-        return 1
+
+        local pgid
+        while (( $#pgid < 20 )); do
+          [[ -t $resp_fd ]]
+          sysread -s $((20 - $#pgid)) -t $timeout -i $resp_fd 'pgid[$#pgid+1]' || return
+        done
+        [[ $pgid == ' '#<1-> ]] || return
+        typeset -gi GITSTATUS_DAEMON_PID_$name=pgid
+
+        sysopen -w -o cloexec -u req_fd -- $file_prefix.fifo || return
+        [[ $req_fd == <1-> ]]                                || return
+        typeset -gi _GITSTATUS_REQ_FD_$name=req_fd
+
+        print -nru $req_fd -- $'}hello\x1f\x1e' || return
+        local expected=$'}hello\x1f0\x1e' actual
+        if (( $+functions[p10k] )) && [[ ! -t 1 && ! -t 0 ]]; then
+          local -F deadline='EPOCHREALTIME + 4'
+        else
+          local -F deadline='1'
+        fi
+        while true; do
+          [[ -t $resp_fd ]]
+          sysread -s 1 -t $timeout -i $resp_fd actual || return
+          [[ $expected == $actual* ]] && break
+          if [[ $actual != $'\1' ]]; then
+            [[ -t $resp_fd ]]
+            while sysread -t $timeout -i $resp_fd 'actual[$#actual+1]'; do
+              [[ -t $resp_fd ]]
+            done
+            culprit=$actual
+            return 1
+          fi
+          (( EPOCHREALTIME < deadline )) && continue
+          if (( deadline > 0 )); then
+            deadline=0
+            if (( stderr_fd )); then
+              unsetopt xtrace
+              exec 2>&$stderr_fd {stderr_fd}>&-
+              stderr_fd=0
+            fi
+            if (( $+functions[p10k] )); then
+              p10k clear-instant-prompt || return
+            fi
+            if [[ $name == POWERLEVEL9K ]]; then
+              local label=powerlevel10k
+            else
+              local label=gitstatus
+            fi
+            if [[ -t 2 ]]; then
+              local spinner=($'\b%3F-%f' $'\b%3F\\%f' $'\b%3F|%f' $'\b%3F/%f')
+              print -Prnu2 -- "[%3F$label%f] fetching %2Fgitstatusd%f ..  "
+            else
+              local spinner=('.')
+              print -rnu2 -- "[$label] fetching gitstatusd .."
+            fi
+          fi
+          print -Prnu2 -- $spinner[1]
+          spinner=($spinner[2,-1] $spinner[1])
+        done
+
+        if (( deadline == 0 )); then
+          if [[ -t 2 ]]; then
+            print -Pru2 -- $'\b[%2Fok%f]'
+          else
+            print -ru2 -- ' [ok]'
+          fi
+          if [[ $xtrace != /dev/null && -o no_xtrace ]]; then
+            exec {stderr_fd}>&2 || return
+            exec 2>>$xtrace     || return
+            setopt xtrace
+          fi
+        fi
+
+        while (( $#actual < $#expected )); do
+          [[ -t $resp_fd ]]
+          sysread -s $(($#expected - $#actual)) -t $timeout -i $resp_fd 'actual[$#actual+1]' || return
+        done
+        [[ $actual == $expected ]] || return
+
+        function _gitstatus_process_response_$name-$fsuf() {
+          emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
+          local pair=${${(%):-%N}#_gitstatus_process_response_}
+          local name=${pair%%-*}
+          local fsuf=${pair#*-}
+          [[ $name == POWERLEVEL9K && $fsuf == _p9k_ ]] && eval $__p9k_intro_base
+          if (( ARGC == 1 )); then
+            _gitstatus_process_response$fsuf $name 0 ''
+          else
+            gitstatus_stop$fsuf $name
+          fi
+        }
+        if ! zle -F $resp_fd _gitstatus_process_response_$name-$fsuf; then
+          unfunction _gitstatus_process_response_$name-$fsuf
+          return 1
+        fi
+
+        function _gitstatus_cleanup_$name-$fsuf() {
+          emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
+          local pair=${${(%):-%N}#_gitstatus_cleanup_}
+          local name=${pair%%-*}
+          local fsuf=${pair#*-}
+          (( _GITSTATUS_CLIENT_PID_$name == sysparams[pid] )) || return
+          gitstatus_stop$fsuf $name
+        }
+        if ! add-zsh-hook zshexit _gitstatus_cleanup_$name-$fsuf; then
+          unfunction _gitstatus_cleanup_$name-$fsuf
+          return 1
+        fi
+
+        if (( lock_fd != -1 )); then
+          zf_rm -- $file_prefix.lock || return
+          zsystem flock -u $lock_fd  || return
+        fi
+        unset _GITSTATUS_LOCK_FD_$name
+
+        typeset -gi _GITSTATUS_STATE_$name=2
       fi
+    }
+  } always {
+    local -i err=$?
+    (( stderr_fd )) && exec 2>&$stderr_fd {stderr_fd}>&-
+    (( err == 0  )) && return
 
-      print -nru $req_fd -- $'hello\x1f\x1e' || return
-      local expected=$'hello\x1f0\x1e' actual
-      while (( $#actual < $#expected )); do
-        [[ -t $resp_fd ]]
-        sysread -s $(($#expected - $#actual)) -t $timeout -i $resp_fd 'actual[$#actual+1]' || return
-      done
-      [[ $actual == $expected ]] || return
+    gitstatus_stop$fsuf $name
 
-      if (( lock_fd != -1 )); then
-        zf_rm -- $file_prefix.lock || return
-        zsystem flock -u $lock_fd  || return
-      fi
-      unset _GITSTATUS_LOCK_FD_$name
-
-      typeset -gi _GITSTATUS_STATE_$name=2
+    setopt prompt_percent no_prompt_subst no_prompt_bang
+    (( $+functions[p10k] )) && p10k clear-instant-prompt
+    print -ru2  -- ''
+    print -Pru2 -- '[%F{red}ERROR%f]: gitstatus failed to initialize.'
+    print -ru2  -- ''
+    if [[ -n $culprit ]]; then
+      print -ru2 -- $culprit
+      return err
+    fi
+    if [[ -s $xtrace ]]; then
+      print -ru2  -- ''
+      print -Pru2 -- "  Zsh log (%U${xtrace//\%/%%}%u):"
+      print -Pru2 -- '%F{yellow}'
+      print -lru2 -- "${(@)${(@f)$(<$xtrace)}/#/    }"
+      print -Pnru2 -- '%f'
+    fi
+    if [[ -s $daemon_log ]]; then
+      print -ru2   -- ''
+      print -Pru2  -- "  Daemon log (%U${daemon_log//\%/%%}%u):"
+      print -Pru2  -- '%F{yellow}'
+      print -lru2  -- "${(@)${(@f)$(<$daemon_log)}/#/    }"
+      print -Pnru2 -- '%f'
+    fi
+    if [[ $GITSTATUS_LOG_LEVEL == DEBUG ]]; then
+      print -ru2   -- ''
+      print -ru2   -- '  System information:'
+      print -Pru2  -- '%F{yellow}'
+      print -ru2   -- "    zsh:      $ZSH_VERSION"
+      print -ru2   -- "    uname -a: $(command uname -a)"
+      print -Pru2  -- '%f'
+      print -ru2   -- '  If you need help, open an issue and attach this whole error message to it:'
+      print -ru2   -- ''
+      print -Pru2  -- '    %Uhttps://github.com/romkatv/gitstatus/issues/new%u'
+    else
+      print -ru2   -- ''
+      local home=~
+      local zshrc=${${${(q)${ZDOTDIR:-~}}/#${(q)home}/'~'}//\%/%%}/.zshrc
+      print -Pru2   -- "  Add the following parameter to %U$zshrc%u for extra diagnostics on error:"
+      print -ru2   -- ''
+      print -Pru2  -- '    %BGITSTATUS_LOG_LEVEL=DEBUG%b'
+      print -ru2   -- ''
+      print -ru2   -- '  Restart Zsh to retry gitstatus initialization:'
+      print -ru2   -- ''
+      print -Pru2   -- '    %F{green}%Uexec%u zsh%f'
     fi
   }
-
-  local -i err=$?
-  (( stderr_fd )) && exec 2>&$stderr_fd
-  (( err == 0  )) && return
-
-  gitstatus_stop $name
-
-  setopt prompt_percent no_prompt_subst no_prompt_bang
-  print -Pru2  -- '[%F{red}ERROR%f]: gitstatus failed to initialize.'
-  print -ru2   -- ''
-  print -ru2   -- '  Your Git prompt may disappear or become slow.'
-  if [[ -s $xtrace ]]; then
-    print -ru2   -- ''
-    print -ru2   -- "  The content of ${(q-)xtrace} (gitstatus_start xtrace):"
-    print -Pru2  -- '%F{yellow}'
-    >&2 awk '{print "    " $0}' <$xtrace
-    print -Pru2 -- "%F{red}                         ^ this command failed ($err)%f"
-  fi
-  if [[ -s $daemon_log ]]; then
-    print -ru2   -- ''
-    print -ru2   -- "  The content of ${(q-)daemon_log} (gitstatus daemon log):"
-    print -Pru2  -- '%F{yellow}'
-    >&2 awk '{print "    " $0}' <$daemon_log
-    print -Pnru2 -- '%f'
-  fi
-  if [[ $GITSTATUS_LOG_LEVEL == DEBUG ]]; then
-    print -ru2   -- ''
-    print -ru2   -- '  Your system information:'
-    print -Pru2  -- '%F{yellow}'
-    print -ru2   -- "    zsh:      $ZSH_VERSION"
-    print -ru2   -- "    uname -a: $(uname -a)"
-    print -Pru2  -- '%f'
-    print -ru2   -- '  If you need help, open an issue and attach this whole error message to it:'
-    print -ru2   -- ''
-    print -Pru2  -- '    %F{green}https://github.com/romkatv/gitstatus/issues/new%f'
-  else
-    print -ru2   -- ''
-    print -ru2   -- '  Run the following command to retry with extra diagnostics:'
-    print -Pru2  -- '%F{green}'
-    local env="GITSTATUS_LOG_LEVEL=DEBUG"
-    if [[ -n $GITSTATUS_NUM_THREADS ]]; then
-      env+=" GITSTATUS_NUM_THREADS=${(q)GITSTATUS_NUM_THREADS}"
-    fi
-    if [[ -n $GITSTATUS_DAEMON ]]; then
-      env+=" GITSTATUS_DAEMON=${(q)GITSTATUS_DAEMON}"
-    fi
-    print -nru2  -- "    ${env} gitstatus_start ${(@q-)*}"
-    print -Pru2  -- '%f'
-    print -ru2   -- ''
-    local zshrc=${(D)ZDOTDIR:-~}/.zshrc
-    print -ru2   -- "  If this command produces no output, add the following parameter to $zshrc:"
-    print -ru2   -- ''
-    print -Pru2  -- '%F{green}    GITSTATUS_LOG_LEVEL=DEBUG%f'
-    print -ru2   -- ''
-    print -ru2   -- '  With this parameter gitstatus will print additional information on error.'
-  fi
-
-  return err
 }
 
 # Stops gitstatusd if it's running.
 #
 # Usage: gitstatus_stop NAME.
-function gitstatus_stop() {
+function gitstatus_stop"${1:-}"() {
   emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
 
+  local fsuf=${${(%):-%N}#gitstatus_stop}
+
   if (( ARGC != 1 )); then
     print -ru2 -- "gitstatus_stop: exactly one positional argument is required"
     return 1
@@ -716,8 +859,8 @@ function gitstatus_stop() {
   local daemon_pid=${(P)daemon_pid_var}
   local file_prefix=${(P)file_prefix_var}
 
-  local cleanup=_gitstatus_cleanup_$name
-  local process=_gitstatus_process_response_$name
+  local cleanup=_gitstatus_cleanup_$name-$fsuf
+  local process=_gitstatus_process_response_$name-$fsuf
 
   if (( $+functions[$cleanup] )); then
     add-zsh-hook -d zshexit $cleanup
@@ -739,16 +882,18 @@ function gitstatus_stop() {
   unset $inflight_var $file_prefix_var $dirty_max_index_size_var
 
   unset VCS_STATUS_RESULT
-  _gitstatus_clear
+  _gitstatus_clear$fsuf
 }
 
 # Usage: gitstatus_check NAME.
 #
 # Returns 0 if and only if `gitstatus_start NAME` has succeeded previously.
 # If it returns non-zero, gitstatus_query NAME is guaranteed to return non-zero.
-function gitstatus_check() {
+function gitstatus_check"${1:-}"() {
   emulate -L zsh -o no_aliases -o extended_glob -o typeset_silent
 
+  local fsuf=${${(%):-%N}#gitstatus_check}
+
   if (( ARGC != 1 )); then
     print -ru2 -- "gitstatus_check: exactly one positional argument is required"
     return 1

gitstatus/gitstatus.prompt.sh

@@ -0,0 +1,111 @@
+# Simple Bash prompt with Git status.
+
+# Source gitstatus.plugin.sh from $GITSTATUS_DIR or from the same directory
+# in which the current script resides if the variable isn't set.
+if [[ -n "${GITSTATUS_DIR-}" ]]; then
+  source "$GITSTATUS_DIR"                           || return
+elif [[ "${BASH_SOURCE[0]}" == */* ]]; then
+  source "${BASH_SOURCE[0]%/*}/gitstatus.plugin.sh" || return
+else
+  source gitstatus.plugin.sh                        || return
+fi
+
+# Sets GITSTATUS_PROMPT to reflect the state of the current git repository.
+# The value is empty if not in a git repository. Forwards all arguments to
+# gitstatus_query.
+#
+# Example value of GITSTATUS_PROMPT: master ⇣42⇡42 ⇠42⇢42 *42 merge ~42 +42 !42 ?42
+#
+#   master  current branch
+#      ⇣42  local branch is 42 commits behind the remote
+#      ⇡42  local branch is 42 commits ahead of the remote
+#      ⇠42  local branch is 42 commits behind the push remote
+#      ⇢42  local branch is 42 commits ahead of the push remote
+#      *42  42 stashes
+#    merge  merge in progress
+#      ~42  42 merge conflicts
+#      +42  42 staged changes
+#      !42  42 unstaged changes
+#      ?42  42 untracked files
+function gitstatus_prompt_update() {
+  GITSTATUS_PROMPT=""
+
+  gitstatus_query "$@"                  || return 1  # error
+  [[ "$VCS_STATUS_RESULT" == ok-sync ]] || return 0  # not a git repo
+
+  local      reset=$'\001\e[0m\002'         # no color
+  local      clean=$'\001\e[38;5;076m\002'  # green foreground
+  local  untracked=$'\001\e[38;5;014m\002'  # teal foreground
+  local   modified=$'\001\e[38;5;011m\002'  # yellow foreground
+  local conflicted=$'\001\e[38;5;196m\002'  # red foreground
+
+  local p
+
+  local where  # branch name, tag or commit
+  if [[ -n "$VCS_STATUS_LOCAL_BRANCH" ]]; then
+    where="$VCS_STATUS_LOCAL_BRANCH"
+  elif [[ -n "$VCS_STATUS_TAG" ]]; then
+    p+="${reset}#"
+    where="$VCS_STATUS_TAG"
+  else
+    p+="${reset}@"
+    where="${VCS_STATUS_COMMIT:0:8}"
+  fi
+
+  (( ${#where} > 32 )) && where="${where:0:12}…${where: -12}"  # truncate long branch names and tags
+  p+="${clean}${where}"
+
+  # ⇣42 if behind the remote.
+  (( VCS_STATUS_COMMITS_BEHIND )) && p+=" ${clean}⇣${VCS_STATUS_COMMITS_BEHIND}"
+  # ⇡42 if ahead of the remote; no leading space if also behind the remote: ⇣42⇡42.
+  (( VCS_STATUS_COMMITS_AHEAD && !VCS_STATUS_COMMITS_BEHIND )) && p+=" "
+  (( VCS_STATUS_COMMITS_AHEAD  )) && p+="${clean}⇡${VCS_STATUS_COMMITS_AHEAD}"
+  # ⇠42 if behind the push remote.
+  (( VCS_STATUS_PUSH_COMMITS_BEHIND )) && p+=" ${clean}⇠${VCS_STATUS_PUSH_COMMITS_BEHIND}"
+  (( VCS_STATUS_PUSH_COMMITS_AHEAD && !VCS_STATUS_PUSH_COMMITS_BEHIND )) && p+=" "
+  # ⇢42 if ahead of the push remote; no leading space if also behind: ⇠42⇢42.
+  (( VCS_STATUS_PUSH_COMMITS_AHEAD  )) && p+="${clean}⇢${VCS_STATUS_PUSH_COMMITS_AHEAD}"
+  # *42 if have stashes.
+  (( VCS_STATUS_STASHES        )) && p+=" ${clean}*${VCS_STATUS_STASHES}"
+  # 'merge' if the repo is in an unusual state.
+  [[ -n "$VCS_STATUS_ACTION"   ]] && p+=" ${conflicted}${VCS_STATUS_ACTION}"
+  # ~42 if have merge conflicts.
+  (( VCS_STATUS_NUM_CONFLICTED )) && p+=" ${conflicted}~${VCS_STATUS_NUM_CONFLICTED}"
+  # +42 if have staged changes.
+  (( VCS_STATUS_NUM_STAGED     )) && p+=" ${modified}+${VCS_STATUS_NUM_STAGED}"
+  # !42 if have unstaged changes.
+  (( VCS_STATUS_NUM_UNSTAGED   )) && p+=" ${modified}!${VCS_STATUS_NUM_UNSTAGED}"
+  # ?42 if have untracked files. It's really a question mark, your font isn't broken.
+  (( VCS_STATUS_NUM_UNTRACKED  )) && p+=" ${untracked}?${VCS_STATUS_NUM_UNTRACKED}"
+
+  GITSTATUS_PROMPT="${p}${reset}"
+}
+
+# Start gitstatusd in the background.
+gitstatus_stop && gitstatus_start -s -1 -u -1 -c -1 -d -1
+
+# On every prompt, fetch git status and set GITSTATUS_PROMPT.
+if [[ -z "${PROMPT_COMMAND[*]}" ]]; then
+  PROMPT_COMMAND=gitstatus_prompt_update
+elif [[ ! "${PROMPT_COMMAND[*]}" =~ [[:space:]\;]?gitstatus_prompt_update[[:space:]\;]? ]]; then
+  # Note: If PROMPT_COMMAND is an array, this will modify its first element.
+  PROMPT_COMMAND=$'gitstatus_prompt_update\n'"$PROMPT_COMMAND"
+fi
+
+# Retain 3 trailing components of the current directory.
+PROMPT_DIRTRIM=3
+
+# Enable promptvars so that ${GITSTATUS_PROMPT} in PS1 is expanded.
+shopt -s promptvars
+
+# Customize prompt. Put $GITSTATUS_PROMPT in it reflect git status.
+#
+# Example:
+#
+#   user@host ~/projects/skynet master ⇡42
+#   $ █
+PS1='\[\033[01;32m\]\u@\h\[\033[00m\] '           # green user@host
+PS1+='\[\033[01;34m\]\w\[\033[00m\]'              # blue current working directory
+PS1+='${GITSTATUS_PROMPT:+ $GITSTATUS_PROMPT}'    # git status (requires promptvars option)
+PS1+='\n\[\033[01;$((31+!$?))m\]\$\[\033[00m\] '  # green/red (success/error) $/# (normal/root)
+PS1+='\[\e]0;\u@\h: \w\a\]'                       # terminal title: user@host: dir

gitstatus/gitstatus.prompt.zsh

@@ -0,0 +1,111 @@
+# Simple Zsh prompt with Git status.
+
+# Source gitstatus.plugin.zsh from $GITSTATUS_DIR or from the same directory
+# in which the current script resides if the variable isn't set.
+source "${GITSTATUS_DIR:-${${(%):-%x}:h}}/gitstatus.plugin.zsh" || return
+
+# Sets GITSTATUS_PROMPT to reflect the state of the current git repository. Empty if not
+# in a git repository. In addition, sets GITSTATUS_PROMPT_LEN to the number of columns
+# $GITSTATUS_PROMPT will occupy when printed.
+#
+# Example:
+#
+#   GITSTATUS_PROMPT='master ⇣42⇡42 ⇠42⇢42 *42 merge ~42 +42 !42 ?42'
+#   GITSTATUS_PROMPT_LEN=39
+#
+#   master  current branch
+#      ⇣42  local branch is 42 commits behind the remote
+#      ⇡42  local branch is 42 commits ahead of the remote
+#      ⇠42  local branch is 42 commits behind the push remote
+#      ⇢42  local branch is 42 commits ahead of the push remote
+#      *42  42 stashes
+#    merge  merge in progress
+#      ~42  42 merge conflicts
+#      +42  42 staged changes
+#      !42  42 unstaged changes
+#      ?42  42 untracked files
+function gitstatus_prompt_update() {
+  emulate -L zsh
+  typeset -g  GITSTATUS_PROMPT=''
+  typeset -gi GITSTATUS_PROMPT_LEN=0
+
+  # Call gitstatus_query synchronously. Note that gitstatus_query can also be called
+  # asynchronously; see documentation in gitstatus.plugin.zsh.
+  gitstatus_query 'MY'                  || return 1  # error
+  [[ $VCS_STATUS_RESULT == 'ok-sync' ]] || return 0  # not a git repo
+
+  local      clean='%76F'   # green foreground
+  local   modified='%178F'  # yellow foreground
+  local  untracked='%39F'   # blue foreground
+  local conflicted='%196F'  # red foreground
+
+  local p
+
+  local where  # branch name, tag or commit
+  if [[ -n $VCS_STATUS_LOCAL_BRANCH ]]; then
+    where=$VCS_STATUS_LOCAL_BRANCH
+  elif [[ -n $VCS_STATUS_TAG ]]; then
+    p+='%f#'
+    where=$VCS_STATUS_TAG
+  else
+    p+='%f@'
+    where=${VCS_STATUS_COMMIT[1,8]}
+  fi
+
+  (( $#where > 32 )) && where[13,-13]="…"  # truncate long branch names and tags
+  p+="${clean}${where//\%/%%}"             # escape %
+
+  # ⇣42 if behind the remote.
+  (( VCS_STATUS_COMMITS_BEHIND )) && p+=" ${clean}⇣${VCS_STATUS_COMMITS_BEHIND}"
+  # ⇡42 if ahead of the remote; no leading space if also behind the remote: ⇣42⇡42.
+  (( VCS_STATUS_COMMITS_AHEAD && !VCS_STATUS_COMMITS_BEHIND )) && p+=" "
+  (( VCS_STATUS_COMMITS_AHEAD  )) && p+="${clean}⇡${VCS_STATUS_COMMITS_AHEAD}"
+  # ⇠42 if behind the push remote.
+  (( VCS_STATUS_PUSH_COMMITS_BEHIND )) && p+=" ${clean}⇠${VCS_STATUS_PUSH_COMMITS_BEHIND}"
+  (( VCS_STATUS_PUSH_COMMITS_AHEAD && !VCS_STATUS_PUSH_COMMITS_BEHIND )) && p+=" "
+  # ⇢42 if ahead of the push remote; no leading space if also behind: ⇠42⇢42.
+  (( VCS_STATUS_PUSH_COMMITS_AHEAD  )) && p+="${clean}⇢${VCS_STATUS_PUSH_COMMITS_AHEAD}"
+  # *42 if have stashes.
+  (( VCS_STATUS_STASHES        )) && p+=" ${clean}*${VCS_STATUS_STASHES}"
+  # 'merge' if the repo is in an unusual state.
+  [[ -n $VCS_STATUS_ACTION     ]] && p+=" ${conflicted}${VCS_STATUS_ACTION}"
+  # ~42 if have merge conflicts.
+  (( VCS_STATUS_NUM_CONFLICTED )) && p+=" ${conflicted}~${VCS_STATUS_NUM_CONFLICTED}"
+  # +42 if have staged changes.
+  (( VCS_STATUS_NUM_STAGED     )) && p+=" ${modified}+${VCS_STATUS_NUM_STAGED}"
+  # !42 if have unstaged changes.
+  (( VCS_STATUS_NUM_UNSTAGED   )) && p+=" ${modified}!${VCS_STATUS_NUM_UNSTAGED}"
+  # ?42 if have untracked files. It's really a question mark, your font isn't broken.
+  (( VCS_STATUS_NUM_UNTRACKED  )) && p+=" ${untracked}?${VCS_STATUS_NUM_UNTRACKED}"
+
+  GITSTATUS_PROMPT="${p}%f"
+
+  # The length of GITSTATUS_PROMPT after removing %f and %F.
+  GITSTATUS_PROMPT_LEN="${(m)#${${GITSTATUS_PROMPT//\%\%/x}//\%(f|<->F)}}"
+}
+
+# Start gitstatusd instance with name "MY". The same name is passed to
+# gitstatus_query in gitstatus_prompt_update. The flags with -1 as values
+# enable staged, unstaged, conflicted and untracked counters.
+gitstatus_stop 'MY' && gitstatus_start -s -1 -u -1 -c -1 -d -1 'MY'
+
+# On every prompt, fetch git status and set GITSTATUS_PROMPT.
+autoload -Uz add-zsh-hook
+add-zsh-hook precmd gitstatus_prompt_update
+
+# Enable/disable the right prompt options.
+setopt no_prompt_bang prompt_percent prompt_subst
+
+# Customize prompt. Put $GITSTATUS_PROMPT in it to reflect git status.
+#
+# Example:
+#
+#   user@host ~/projects/skynet master ⇡42
+#   % █
+#
+# The current directory gets truncated from the left if the whole prompt doesn't fit on the line.
+PROMPT='%70F%n@%m%f '                                  # green user@host
+PROMPT+='%39F%$((-GITSTATUS_PROMPT_LEN-1))<…<%~%<<%f'  # blue current working directory
+PROMPT+='${GITSTATUS_PROMPT:+ $GITSTATUS_PROMPT}'      # git status
+PROMPT+=$'\n'                                          # new line
+PROMPT+='%F{%(?.76.196)}%#%f '                         # %/# (normal/root); green/red (ok/error)

gitstatus/install

@@ -0,0 +1,476 @@
+#!/bin/sh
+#
+# This script does not have a stable API.
+
+_gitstatus_install_daemon_found() {
+  local installed="$1"
+  shift
+  [ $# = 0 ] || "$@" "$daemon" "$version" "$installed"
+}
+
+_gitstatus_install_main() {
+  if [ -n "${ZSH_VERSION:-}" ]; then
+    emulate -L sh -o no_unset
+  else
+    set -u
+  fi
+
+  local argv1="$1"
+  shift
+
+  local no_check= no_install= uname_s= uname_m= gitstatus_dir= dl_status= e=
+  local opt= OPTARG= OPTIND=1
+
+  while getopts ':s:m:d:p:e:fnh' opt "$@"; do
+    case "$opt" in
+      h)
+        command cat <<\END
+Usage: install [-s KERNEL] [-m ARCH] [-d DIR] [-p CMD] [-e ERRFD] [-f|-n] [-- CMD [ARG]...]
+
+If positional arguments are specified, call this on success:
+
+  CMD [ARG]... DAEMON VERSION INSTALLED
+
+DAEMON is path to gitstatusd. VERSION is a glob pattern for the
+version this daemon should support; it's supposed to be passed as
+-G to gitstatusd. INSTALLED is 1 if gitstatusd has just been
+downloaded and 0 otherwise.
+
+Options:
+
+  -s KERNEL  use this instead of lowercase `uname -s`
+  -m ARCH    use this instead of lowercase `uname -m`
+  -d DIR     use this instead of `dirname "$0"`
+  -p CMD     eval this every second while downloading gitstatusd
+  -e ERRFD   write error messages to this file descriptor
+  -f         download gitstatusd even if there is one locally
+  -n         do not download gitstatusd (fail instead)
+END
+        return
+      ;;
+      n)
+        if [ -n "$no_install" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        no_install=1
+      ;;
+      f)
+        if [ -n "$no_check" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        no_check=1
+      ;;
+      d)
+        if [ -n "$gitstatus_dir" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        if [ -z "$OPTARG" ]; then
+          >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+          return 1
+        fi
+        gitstatus_dir="$OPTARG"
+      ;;
+      p)
+        if [ -n "$dl_status" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        if [ -z "$OPTARG" ]; then
+          >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+          return 1
+        fi
+        dl_status="$OPTARG"
+      ;;
+      e)
+        if [ -n "$e" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        if [ -z "$OPTARG" ]; then
+          >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+          return 1
+        fi
+        e="$OPTARG"
+      ;;
+      m)
+        if [ -n "$uname_m" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        if [ -z "$OPTARG" ]; then
+          >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+          return 1
+        fi
+        uname_m="$OPTARG"
+      ;;
+      s)
+        if [ -n "$uname_s" ]; then
+          >&2 echo "[gitstatus] error: duplicate option: -$opt"
+          return 1
+        fi
+        if [ -z "$OPTARG" ]; then
+          >&2 echo "[error] incorrect value of -$opt: $OPTARG"
+          return 1
+        fi
+        uname_s="$OPTARG"
+      ;;
+      \?) >&2 echo "[gitstatus] error: invalid option: -$OPTARG"           ; return 1;;
+      :)  >&2 echo "[gitstatus] error: missing required argument: -$OPTARG"; return 1;;
+      *)  >&2 echo "[gitstatus] internal error: unhandled option: -$opt"   ; return 1;;
+    esac
+  done
+
+  shift "$((OPTIND - 1))"
+
+  : "${e:=2}"
+  : "${gitstatus_dir:=$argv1}"
+
+  if [ -n "$no_check" -a -n "$no_install" ]; then
+    >&2 echo "[gitstatus] error: incompatible options: -f, -n"
+    return 1
+  fi
+
+  if [ -z "$uname_s" ]; then
+    uname_s="$(command uname -s)" || return
+    uname_s="$(printf '%s' "$uname_s" | command tr '[A-Z]' '[a-z]')" || return
+  fi
+  if [ -z "$uname_m" ]; then
+    uname_m="$(command uname -m)" || return
+    uname_m="$(printf '%s' "$uname_m" | command tr '[A-Z]' '[a-z]')" || return
+  fi
+
+  local daemon="${GITSTATUS_DAEMON:-}"
+  local cache_dir="${GITSTATUS_CACHE_DIR:-${XDG_CACHE_HOME:-$HOME/.cache}/gitstatus}"
+
+  if [ -z "$no_check" ]; then
+    if [ -n "${daemon##/*}" ]; then
+      >&2 echo "[gitstatus] error: GITSTATUS_DAEMON is not absolute path: $daemon"
+      return 1
+    fi
+    if [ -z "$daemon" -a -e "$gitstatus_dir"/usrbin/gitstatusd ]; then
+      daemon="$gitstatus_dir"/usrbin/gitstatusd
+    fi
+    if [ -n "$daemon" ]; then
+      local gitstatus_version= libgit2_version=
+      if ! . "$gitstatus_dir"/build.info; then
+        >&2 echo "[gitstatus] internal error: failed to source build.info"
+        return 1
+      fi
+      if [ -z "$gitstatus_version" ]; then
+        >&2 echo "[gitstatus] internal error: empty gitstatus_version in build.info"
+        return 1
+      fi
+      local version="$gitstatus_version"
+      _gitstatus_install_daemon_found 0 "$@"
+      return
+    fi
+  fi
+
+  while IFS= read -r line; do
+    line="${line###*}"
+    [ -n "$line" ] || continue
+
+    local uname_s_glob= uname_m_glob= file= version= sha256=
+    eval "$line" || return
+
+    if [ -z "$uname_s_glob" -o \
+         -z "$uname_m_glob" -o \
+         -z "$file"         -o \
+         -z "$version"      -o \
+         -z "$sha256" ]; then
+      >&2 echo "[gitstatus] internal error: invalid install.info line: $line"
+      return 1
+    fi
+
+    case "$uname_s" in
+      $uname_s_glob) ;;
+      *) continue;;
+    esac
+    case "$uname_m" in
+      $uname_m_glob) ;;
+      *) continue;;
+    esac
+
+    # Found a match. The while loop will terminate during this iteration.
+
+    if [ -z "$no_check" ]; then
+      # Check if a suitable gitstatusd already exists.
+      local daemon="$gitstatus_dir"/usrbin/"$file"
+      if [ ! -e "$daemon" ]; then
+        daemon="$cache_dir"/"$file"
+        [ -e "$daemon" ] || daemon=
+      fi
+      if [ -n "$daemon" ]; then
+        _gitstatus_install_daemon_found 0 "$@"
+        return
+      fi
+    fi
+
+    # No suitable gitstatusd exists. Need to download.
+
+    if [ -n "$no_install" ]; then
+      >&2 echo "[gitstatus] error: no gitstatusd found and installation is disabled"
+      return 1
+    fi
+
+    local daemon="$cache_dir"/"$file"
+
+    if [ -n "${cache_dir##/*}" ]; then
+      >&2 echo "[gitstatus] error: GITSTATUS_CACHE_DIR is not absolute: $cache_dir"
+      return 1
+    fi
+    if [ ! -d "$cache_dir" ] && ! mkdir -p -- "$cache_dir" || [ ! -w "$cache_dir" ]; then
+      local dir="$cache_dir"
+      while true; do
+        if [ -e "$dir" ]; then
+          if [ ! -d "$dir" ]; then
+            >&"$e" printf 'Not a directory: \033[4;31m%s\033[0m\n' "$dir"
+            >&"$e" printf '\n'
+            >&"$e" printf 'Delete it, then restart your shell.\n'
+          elif [ ! -w "$dir" ]; then
+            >&"$e" printf 'Directory is not writable: \033[4;31m%s\033[0m\n' "$dir"
+            >&"$e" printf '\n'
+            >&"$e" printf 'Make it writable, then restart your shell.\n'
+          fi
+          break
+        fi
+        if [ "$dir" = / ] || [ "$dir" = . ]; then
+          break
+        fi
+        dir="$(dirname -- "$dir")"
+      done
+      return 1
+    fi
+
+    if [ -n "${TMPDIR-}" -a '(' '(' -d "${TMPDIR-}" -a -w "${TMPDIR-}" ')' -o '!' '(' -d /tmp -a -w /tmp ')' ')' ]; then
+      local tmp="$TMPDIR"
+    else
+      local tmp=/tmp
+    fi
+    if ! command -v mktemp >/dev/null 2>&1 ||
+       ! tmpdir="$(command mktemp -d "$tmp"/gitstatus-install.XXXXXXXXXX)"; then
+      tmpdir="$tmp/gitstatus-install.tmp.$$"
+      if ! mkdir -p -- "$tmpdir"; then
+        if [ "$tmp" = /tmp ]; then
+          local label='directory'
+        else
+          local label='directory (\033[1mTMPDIR\033[m)'
+        fi
+        if [ ! -e "$tmp" ]; then
+          >&"$e" printf 'Temporary '"$label"' does not exist: \033[4;31m%s\033[0m\n' "$tmp"
+          >&"$e" printf '\n'
+          >&"$e" printf 'Create it, then restart your shell.\n'
+        elif [ ! -d "$tmp" ]; then
+          >&"$e" printf 'Not a '"$label"': \033[4;31m%s\033[0m\n' "$tmp"
+          >&"$e" printf '\n'
+          >&"$e" printf 'Make it a directory, then restart your shell.\n'
+        elif [ ! -w "$tmp" ]; then
+          >&"$e" printf 'Temporary '"$label"' is not writable: \033[4;31m%s\033[0m\n' "$tmp"
+          >&"$e" printf '\n'
+          >&"$e" printf 'Make it writable, then restart your shell.\n'
+        fi
+        return 1
+      fi
+    fi
+
+    if ! command -v curl >/dev/null 2>&1 && ! command -v wget >/dev/null 2>&1; then
+      >&"$e" printf 'Please install \033[32mcurl\033[0m or \033[32mwget\033[0m, then restart your shell.\n'
+      return 1
+    fi
+
+    (
+      run_cmd() {
+        command -v "$1" >/dev/null 2>/dev/null || return 127
+        local trapped= pid die ret
+        trap 'trapped=1' $sig
+        # The only reason for suppressing stderr is that `curl -f` cannot be silenced:
+        # `-s` doesn't work despite what the docs say.
+        command "$@" 2>/dev/null &
+        ret="$?"
+        if [ "$ret" = 0 ]; then
+          pid="$!"
+          die="trap - $sig; kill -- $pid 2>/dev/null; wait -- $pid 2>/dev/null; exit 1"
+          trap "$die" $sig
+          [ -z "$trapped" ] || eval "$die"
+          wait -- "$pid" 2>/dev/null
+          ret="$?"
+        fi
+        trap - $sig
+        [ -z "$trapped" ] || exit
+        return "$ret"
+      }
+
+      check_sha256() {
+        local data_file="$tmpdir"/"$1".tar.gz
+        local hash_file="$tmpdir"/"$1".tar.gz.sha256
+        local hash=
+        {
+          command -v shasum >/dev/null 2>/dev/null                            &&
+            run_cmd shasum -b -a 256 -- "$data_file" >"$hash_file" </dev/null &&
+            IFS= read -r hash <"$hash_file"                                   &&
+            hash="${hash%% *}"                                                &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          command -v sha256sum >/dev/null 2>/dev/null                         &&
+            run_cmd sha256sum -b -- "$data_file" >"$hash_file" </dev/null     &&
+            IFS= read -r hash <"$hash_file"                                   &&
+            hash="${hash%% *}"                                                &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          # Note: sha256 can be from hashalot. It's incompatible.
+          # Thankfully, it produces shorter output.
+          command -v sha256 >/dev/null 2>/dev/null &&
+            run_cmd sha256 -- "$data_file" >"$hash_file" </dev/null &&
+            IFS= read -r hash <"$hash_file" &&
+            hash="${hash##* }" &&
+            [ ${#hash} -eq 64 ]
+        } || {
+          hash=
+        }
+        [ "$1" = 1 -a -z "$hash" -o "$hash" = "$sha256" ]
+      }
+
+      local url1="https://github.com/romkatv/gitstatus/releases/download/$version/$file.tar.gz"
+      local url2="https://gitee.com/romkatv/gitstatus/raw/release-$version/release/$file.tar.gz"
+      local sig='INT QUIT TERM ILL PIPE'
+
+      fetch() {
+        if [ "$1" != 1 ] && command -v sleep >/dev/null 2>/dev/null; then
+          if ! run_cmd sleep "$1"; then
+            echo -n >"$tmpdir"/"$1".status
+            return 1
+          fi
+        fi
+        local cmd part url ret
+        for cmd in 'curl -kfsSL' 'wget -qO-' 'curl -q -kfsSL' 'wget --no-config -qO-'; do
+          part=0
+          while true; do
+            if [ "$part" = 2 ]; then
+              ret=1
+              break
+            elif [ "$part" = 0 ]; then
+              url="$2"
+            else
+              url="$2"."$part"
+            fi
+            run_cmd $cmd -- "$url" >>"$tmpdir"/"$1".tar.gz
+            ret="$?"
+            [ "$ret" = 0 ] || break
+            check_sha256 "$1" && break
+            part=$((part+1))
+          done
+          [ "$ret" = 0 ] && break
+          run_cmd rm -f -- "$tmpdir"/"$1".tar.gz && continue
+          ret="$?"
+          break
+        done
+        echo -n >"$tmpdir"/"$1".status
+        return "$ret"
+      }
+
+      local trapped=
+      trap 'trapped=1' $sig
+      fetch 1 "$url1" &
+      local pid1="$!"
+      fetch 2 "$url2" &
+      local pid2="$!"
+
+      local die="trap - $sig; kill -- $pid1 $pid2 2>/dev/null; wait -- $pid1 $pid2 2>/dev/null; exit 1"
+      trap "$die" $sig
+      [ -z "$trapped" ] || eval "$die"
+
+      local n=
+      while true; do
+        [ -z "$dl_status" ] || eval "$dl_status" || eval "$die"
+        if command -v sleep >/dev/null 2>/dev/null; then
+          command sleep 1
+        elif command -v true >/dev/null 2>/dev/null; then
+          command true
+        fi
+        if [ -n "$pid1" -a -e "$tmpdir"/1.status ]; then
+          wait -- "$pid1" 2>/dev/null
+          local ret="$?"
+          pid1=
+          if [ "$ret" = 0 ]; then
+            if [ -n "$pid2" ]; then
+              kill -- "$pid2" 2>/dev/null
+              wait -- "$pid2" 2>/dev/null
+            fi
+            n=1
+            break
+          elif [ -z "$pid2" ]; then
+            break
+          else
+            die="trap - $sig; kill -- $pid2 2>/dev/null; wait -- $pid2 2>/dev/null; exit 1"
+            trap "$die" $sig
+          fi
+        elif [ -n "$pid2" -a -e "$tmpdir"/2.status ]; then
+          wait -- "$pid2" 2>/dev/null
+          local ret="$?"
+          pid2=
+          if [ "$ret" = 0 ]; then
+            if [ -n "$pid1" ]; then
+              kill -- "$pid1" 2>/dev/null
+              wait -- "$pid1" 2>/dev/null
+            fi
+            n=2
+            break
+          elif [ -z "$pid1" ]; then
+            break
+          else
+            die="trap - $sig; kill -- $pid1 2>/dev/null; wait -- $pid1 2>/dev/null; exit 1"
+            trap "$die" $sig
+          fi
+        fi
+      done
+
+      trap - $sig
+
+      if [ -z "$n" ]; then
+        >&"$e" printf 'Failed to download \033[32m%s\033[0m from any mirror:\n' "$file"
+        >&"$e" printf '\n'
+        >&"$e" printf '  1. \033[4m%s\033[0m\n' "$url1"
+        >&"$e" printf '  2. \033[4m%s\033[0m\n' "$url2"
+        >&"$e" printf '\n'
+        >&"$e" printf 'Check your internet connection, then restart your shell.\n'
+        exit 1
+      fi
+
+      command tar -C "$tmpdir" -xzf "$tmpdir"/"$n".tar.gz || exit
+
+      local tmpfile
+      if ! command -v mktemp >/dev/null 2>&1 ||
+         ! tmpfile="$(command mktemp "$cache_dir"/gitstatusd.XXXXXXXXXX)"; then
+        tmpfile="$cache_dir"/gitstatusd.tmp.$$
+      fi
+
+      command mv -f -- "$tmpdir"/"$file" "$tmpfile" || exit
+      command mv -f -- "$tmpfile" "$cache_dir"/"$file" && exit
+      command rm -f -- "$cache_dir"/"$file"
+      command mv -f -- "$tmpfile" "$cache_dir"/"$file" && exit
+      command rm -f -- "$tmpfile"
+      exit 1
+    )
+
+    local ret="$?"
+    command rm -rf -- "$tmpdir"
+    [ "$ret" = 0 ] || return
+
+    _gitstatus_install_daemon_found 1 "$@"
+    return
+  done <"$gitstatus_dir"/install.info
+
+  >&"$e" printf 'There is no prebuilt \033[32mgitstatusd\033[0m for \033[1m%s\033[0m.\n' "$uname_s $uname_m"
+  >&"$e" printf '\n'
+  >&"$e" printf 'See: \033[4mhttps://github.com/romkatv/gitstatus#compiling\033[0m\n'
+  return 1
+}
+
+if [ -z "${0##*/*}" ]; then
+  _gitstatus_install_main "${0%/*}" "$@"
+else
+  _gitstatus_install_main . "$@"
+fi

gitstatus/install.info

@@ -0,0 +1,34 @@
+# 3
+#
+# This file is used by ./install and indirectly by shell bindings.
+#
+# The first line is read by powerlevel10k instant prompt. It must
+# be updated whenever the content of this file changes. The actual
+# value doesn't matter as long as it's unique. Consecutive integers
+# work fine.
+
+# Official gitstatusd binaries.
+uname_s_glob="cygwin_nt-10.0"; uname_m_glob="i686";    file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="5a8a809dcebdb6aa9b47d37e086c0485424a9d9c136770eec3c26cedf5bb75e3";
+uname_s_glob="cygwin_nt-10.0"; uname_m_glob="x86_64";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.1"; sha256="c84cade0d6b86e04c27a6055f45851f6b46d6b88ba58772f7ca8ef4d295c800f";
+uname_s_glob="darwin";         uname_m_glob="arm64";   file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="eae979e990ca37c56ee39fadd0c3f392cbbd0c6bdfb9a603010be60d9e48910a";
+uname_s_glob="darwin";         uname_m_glob="x86_64";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="9fd3913ec1b6b856ab6e08a99a2343f0e8e809eb6b62ca4b0963163656c668e6";
+uname_s_glob="freebsd";        uname_m_glob="amd64";   file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="8e57ad642251e5acfa430aed82cd4ffe103db0bfadae4a15ccaf462c455d0442";
+uname_s_glob="linux";          uname_m_glob="aarch64"; file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="32b57eb28bf6d80b280e4020a0045184f8ca897b20b570c12948aa6838673225";
+uname_s_glob="linux";          uname_m_glob="armv6l";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.1"; sha256="4bf5a0d0a082f544a48536ad3675930d5d2cc6a8cf906710045e0788f51192b3";
+uname_s_glob="linux";          uname_m_glob="armv7l";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.1"; sha256="2b9deb29f86c8209114b71b94fc2e1ed936a1658808a1bee46f4a82fd6a1f8cc";
+uname_s_glob="linux";          uname_m_glob="armv8l";  file="gitstatusd-${uname_s}-aarch64";        version="v1.5.4"; sha256="32b57eb28bf6d80b280e4020a0045184f8ca897b20b570c12948aa6838673225";
+uname_s_glob="linux";          uname_m_glob="i686";    file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="56d55e2e9a202d3072fa612d8fa1faa61243ffc86418a7fa64c2c9d9a82e0f64";
+uname_s_glob="linux";          uname_m_glob="ppc64le"; file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="1afd072c8c26ef6ec2d9ac11cef96c84cd6f10e859665a6ffcfb6112c758547e";
+uname_s_glob="linux";          uname_m_glob="x86_64";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.4"; sha256="9633816e7832109e530c9e2532b11a1edae08136d63aa7e40246c0339b7db304";
+uname_s_glob="msys_nt-10.0";   uname_m_glob="i686";    file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.1"; sha256="7f9b849fc52e7a95b9b933e25121ad5ae990a1871aad6616922ad7bcf1eebf20";
+uname_s_glob="msys_nt-10.0";   uname_m_glob="x86_64";  file="gitstatusd-${uname_s}-${uname_m}";     version="v1.5.1"; sha256="5d3c626b5ee564dbc13ddba89752dc58b0efe925b26dbd8b2304849d9ba01732";
+
+# Fallbacks to official gitstatusd binaries.
+uname_s_glob="cygwin_nt-*";    uname_m_glob="i686";    file="gitstatusd-cygwin_nt-10.0-${uname_m}"; version="v1.5.2"; sha256="5a8a809dcebdb6aa9b47d37e086c0485424a9d9c136770eec3c26cedf5bb75e3";
+uname_s_glob="cygwin_nt-*";    uname_m_glob="x86_64";  file="gitstatusd-cygwin_nt-10.0-${uname_m}"; version="v1.5.1"; sha256="c84cade0d6b86e04c27a6055f45851f6b46d6b88ba58772f7ca8ef4d295c800f";
+uname_s_glob="mingw32_nt-*";   uname_m_glob="i686";    file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="7f9b849fc52e7a95b9b933e25121ad5ae990a1871aad6616922ad7bcf1eebf20";
+uname_s_glob="mingw32_nt-*";   uname_m_glob="x86_64";  file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="5d3c626b5ee564dbc13ddba89752dc58b0efe925b26dbd8b2304849d9ba01732";
+uname_s_glob="mingw64_nt-*";   uname_m_glob="i686";    file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="7f9b849fc52e7a95b9b933e25121ad5ae990a1871aad6616922ad7bcf1eebf20";
+uname_s_glob="mingw64_nt-*";   uname_m_glob="x86_64";  file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="5d3c626b5ee564dbc13ddba89752dc58b0efe925b26dbd8b2304849d9ba01732";
+uname_s_glob="msys_nt-*";      uname_m_glob="i686";    file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="7f9b849fc52e7a95b9b933e25121ad5ae990a1871aad6616922ad7bcf1eebf20";
+uname_s_glob="msys_nt-*";      uname_m_glob="x86_64";  file="gitstatusd-msys_nt-10.0-${uname_m}";   version="v1.5.1"; sha256="5d3c626b5ee564dbc13ddba89752dc58b0efe925b26dbd8b2304849d9ba01732";

gitstatus/mbuild

@@ -0,0 +1,406 @@
+#!/usr/bin/env zsh
+#
+# This script does not have a stable API.
+#
+# Usage: mbuild [-b git-ref] [kernel-arch]...
+#
+# Builds a bunch of gitstatusd-* binaries. Without arguments builds binaries
+# for all platforms. git-ref defaults to master.
+#
+# Before using this script you need to set up build servers and list them
+# in ~/.ssh/config. There should be a Host entry for every value of `assets`
+# association defined below. VMs and cloud instances work as well as physical
+# machines, including localhost. As long as the machine has been set up as
+# described below and you can SSH to it without password, it should work.
+#
+#                    ===[ Build Server Setup ]===
+#
+#                              Linux
+#
+# - Install docker.
+#   $ apt install docker.io     # adjust appropriately if there is no `apt`
+#   $ usermod -aG docker $USER  # not needed if going to build as root
+# - Install git.
+#   $ apt install git           # adjust appropriately if there is no `apt`
+#
+#                              macOS
+#
+# - Install compiler tools:
+#   $ xcode-select --install
+# - Install homebrew: https://brew.sh/.
+#   $ bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
+#
+#                             FreeBSD
+#
+# - Install git.
+#   $ pkg install git
+#
+#                             Windows
+#
+# - Disable Windows Defender (optional).
+#   ps> Set-MpPreference -DisableRealtimeMonitoring $true
+# - Install 64-bit and 32-bit msys2: https://www.msys2.org/wiki/MSYS2-installation/.
+#   - Open each of them after installation, type `pacman -Syu --noconfirm` and close the window.
+#   - Then run in powershell while having no msys2 or cygwin windows open:
+#     ps> C:\msys32\autorebase.bat
+#     ps> C:\msys64\autorebase.bat
+# - Install 64-bit and 32-bit cygwin: https://cygwin.com/install.html.
+#   - Choose to install 32-bit to c:/cygwin32 instead of the default c:/cygwin.
+#   - Select these packages: binutils, cmake, gcc-core, gcc-g++, git, make, perl, wget.
+#
+# IMPORTANT: Install msys2 and cygwin one at a time.
+#
+# IMPORTANT: msys2 builder can reboot the build machine.
+#
+# Option 1: OpenSSH for Windows
+#
+# - Install OpenSSH: https://docs.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse.
+#   ps> Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0
+#   ps> Start-Service sshd
+#   ps> Set-Service -Name sshd -StartupType 'Automatic'
+# - Enable publickey authentication: https://stackoverflow.com/a/50502015/1095235.
+#   ps> cd $env:USERPROFILE
+#   ps> mkdir .ssh
+#   ps> notepad.exe .ssh/authorized_keys
+#     - Paste your public key, save, close.
+#   ps> icacls .ssh/authorized_keys /inheritance:r
+#   ps> notepad.exe C:\ProgramData\ssh\sshd_config
+#     - Comment out these two lines, save, close:
+#       # Match Group administrators
+#       #   AuthorizedKeysFile __PROGRAMDATA__/ssh/administrators_authorized_keys
+#   ps> Restart-Service sshd
+#
+# Option 2: OpenSSH from WSL
+#
+# - Install WSL.
+# - Install Ubuntu.
+# - Install sshd.
+#   $ apt install openssh-server
+#   $ dpkg-reconfigure openssh-server
+#   $ cat >/etc/ssh/sshd_config <<\END
+#     ClientAliveInterval 60
+#     AcceptEnv TERM LANG LC_*
+#     PermitRootLogin no
+#     AllowTcpForwarding no
+#     AllowAgentForwarding no
+#     AllowStreamLocalForwarding no
+#     AuthenticationMethods publickey
+#   END
+#   service ssh --full-restart
+# - Add your public ssh key to ~/.ssh/authorized_keys.
+# - Make `sshd` start when Windows boots.
+
+'emulate' '-L' 'zsh' '-o' 'no_aliases' '-o' 'err_return'
+setopt no_unset extended_glob pipe_fail prompt_percent typeset_silent \
+  no_prompt_subst no_prompt_bang pushd_silent warn_create_global
+
+if [[ $ZSH_VERSION != (5.<1->*|<6->.*) || $ZSH_VERSION == 5.4(|.*) ]]; then
+  print -ru2 -- "[error] unsupported zsh version: $ZSH_VERSION"
+  return 1
+fi
+
+zmodload zsh/system
+
+local -r git_url='https://github.com/romkatv/gitstatus.git'
+
+local -rA assets=(
+  # target kernel-arch   hostname of the build machine
+  cygwin_nt-10.0-i686    build-windows-x86_64
+  cygwin_nt-10.0-x86_64  build-windows-x86_64
+  msys_nt-10.0-i686      build-windows-x86_64
+  msys_nt-10.0-x86_64    build-windows-x86_64
+  darwin-arm64           build-macos-arm64
+  darwin-x86_64          build-macos-x86_64
+  freebsd-amd64          build-freebsd-amd64
+  linux-aarch64          build-linux-aarch64
+  linux-armv6l           build-linux-armv7l
+  linux-armv7l           build-linux-armv7l
+  linux-i686             build-linux-x86_64
+  linux-ppc64le          build-linux-ppc64le
+  linux-x86_64           build-linux-x86_64
+)
+
+local -rA protocol=(
+  'cygwin_nt-10.0-*' windows
+  'msys_nt-10.0-*'   windows
+  'darwin-*'         unix
+  'freebsd-*'        unix
+  'linux-*'          unix
+)
+
+local -r rootdir=${ZSH_SCRIPT:h}
+local -r logs=$rootdir/logs
+local -r locks=$rootdir/locks
+local -r binaries=$rootdir/usrbin
+
+function usage() {
+  print -r -- 'usage: mbuild [-b REF] [KERNEL-ARCH]...'
+}
+
+local OPTARG opt git_ref=master
+local -i OPTIND
+while getopts ":b:h" opt; do
+  case $opt in
+    h) usage; return 0;;
+    b) [[ -n $OPTARG ]]; git_ref=$OPTARG;;
+    \?) print -ru2 -- "mbuild: invalid option: -$OPTARG"           ; return 1;;
+    :)  print -ru2 -- "mbuild: missing required argument: -$OPTARG"; return 1;;
+    *)  print -ru2 -- "mbuild: invalid option: -$opt"              ; return 1;;
+  esac
+done
+
+shift $((OPTIND - 1))
+
+(( $# )) || set -- ${(ko)assets}
+set -- ${(u)@}
+
+local platform
+for platform; do
+  if (( ! $+assets[$platform] )); then
+    print -ru2 -- "mbuild: invalid platform: $platform"
+    return 1
+  fi
+done
+
+local build='
+  rm -rf gitstatus
+  git clone --recursive --shallow-submodules --depth=1 -b '$git_ref' '$git_url'
+  cd gitstatus
+  if command -v zsh >/dev/null 2>&1; then
+    sh=zsh
+  elif command -v dash >/dev/null 2>&1; then
+    sh=dash
+  elif command -v ash >/dev/null 2>&1; then
+    sh=ash
+  else
+    sh=sh
+  fi
+  $sh -x ./build -m '
+
+function build-unix() {
+  local intro flags=(-sw)
+  case $2 in
+    linux-ppc64le) ;;
+    linux-*)       flags+=(-d docker);;
+    darwin-arm64)  intro='PATH="/opt/homebrew/bin:$PATH"';;
+    darwin-*)      intro='PATH="/usr/local/bin:$PATH"';;
+  esac
+  ssh $1 -- /bin/sh -uex <<<"
+    $intro
+    cd /tmp
+    $build ${2##*-} ${(j: :)${(@q)flags}}"
+  scp $1:/tmp/gitstatus/usrbin/gitstatusd $binaries/gitstatusd-$2
+}
+
+function build-windows() {
+  local shell=$(ssh $1 'echo $0')
+  if [[ $shell == '$0'* ]]; then
+    local c='c:'
+  else
+    local c='/mnt/c'
+  fi
+
+  local tmp env bin intro flags=(-w)
+  case $2 in
+    cygwin_nt-10.0-i686)   bin='cygwin32/bin'  ;|
+    cygwin_nt-10.0-x86_64) bin='cygwin64/bin'  ;|
+    msys_nt-10.0-i686)     bin='msys32/usr/bin';|
+    msys_nt-10.0-x86_64)   bin='msys64/usr/bin';|
+    cygwin_nt-10.0-*)
+      tmp='/cygdrive/c/tmp'
+    ;|
+    msys_nt-10.0-*)
+      tmp='/c/tmp'
+      env='MSYSTEM=MSYS'
+      # TODO: fix this (some errors about PGP keys).
+      # flags+=(-s)
+      # intro='pacman -S --needed --noconfirm git; '
+      intro+='PATH="$PATH:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl"'
+      while true; do
+        # TODO: run autorebase only when getting an error that can be fixed by autorebasing.
+        break
+        local out
+        out="$(ssh $1 cmd.exe "$c/${bin%%/*}/autorebase.bat" 2>&1)"
+        [[ $out == *"The following DLLs couldn't be rebased"* ]] || break
+        # Reboot to get rid of whatever is using those DLLs.
+        ssh $1 powershell.exe <<<'Restart-Computer -Force' || true
+        sleep 30
+        while ! ssh $1 <<<''; do sleep 5; done
+      done
+      () {
+        while true; do
+          # TODO: fix this (some errors about PGP keys).
+          break
+          local -i fd
+          exec {fd}< <(
+            ssh $1 $c/$bin/env.exe $env c:/$bin/bash.exe -l 2>&1 <<<"
+              pacman -Syu --noconfirm
+              exit")
+          {
+            local line
+            while true; do
+              IFS= read -u $fd -r line || return 0
+              if [[ $line == *"warning: terminate MSYS2"* ]]; then
+                # At this point the machine is hosed. A rogue process with a corrupted name
+                # is eating all CPU. The top SSH connection won't terminate on its own.
+                ssh $1 powershell.exe <<<'Restart-Computer -Force' || true
+                sleep 30
+                while ! ssh $1 <<<''; do sleep 5; done
+                break
+              fi
+            done
+          } always {
+            exec {fd}<&-
+            kill -- -$sysparams[procsubstpid] 2>/dev/null || true
+          }
+        done
+      } "$@"
+    ;|
+  esac
+
+  ssh $1 $c/$bin/env.exe $env c:/$bin/bash.exe -l <<<"
+    set -uex
+    $intro
+    mkdir -p -- $tmp
+    cd -- $tmp
+    $build ${2##*-} ${(j: :)${(@q)flags}}
+    exit"
+  scp $1:$c/tmp/gitstatus/usrbin/gitstatusd $binaries/gitstatusd-$2
+  chmod +x $binaries/gitstatusd-$2
+}
+
+if [[ -r /proc/version && "$(</proc/version)" == *Microsoft* ]]; then
+  () {
+    (( $# )) || return 0
+    print -ru2 -- "WARNING: lock files exist: $@"
+    (( $# )) && rm -- $@
+  } $locks/*(N)
+
+  function flock() {
+    local fd
+    sysopen -ro cloexec -u fd <(
+      exec </dev/null 2>/dev/null
+      (
+        trap '' TERM PIPE
+        local fd
+        while true; do
+          sysopen -wo create,excl -u fd -- $1 && break
+          sleep 1
+        done
+        exec {fd}>&-
+        while true; do
+          print || break
+        done
+        rm -- $1
+      ) &!
+    )
+    local REPLY
+    IFS= read -ru $fd
+  }
+else
+  function flock() {
+    : >>$1
+    zsystem flock $1
+  }
+fi
+
+function build() (
+  setopt xtrace
+  local platform=$1
+  local machine=$assets[$platform]
+  flock $locks/$machine
+  build-${protocol[(k)$platform]} $machine $platform
+  local tmp=gitstatusd-$platform.tmp.$$.tar.gz
+  ( cd -q -- $binaries; tar --owner=0 --group=0 -I 'gzip -9' -cf $tmp gitstatusd-$platform )
+  mv -f -- $binaries/$tmp $binaries/gitstatusd-$platform.tar.gz
+  # Make sure the last command is a built-in (important for flock).
+  :
+)
+
+function mbuild() {
+  local platform pid pids=()
+  for platform; do
+    build $platform &>$logs/$platform &
+    print -r -- "starting build for $platform on $assets[$platform] (pid $!)"
+    pids+=($platform $!)
+  done
+  local failed=()
+  for platform pid in $pids; do
+    print -rn -- "$platform => "
+    if wait $pid; then
+      print -r -- "ok"
+    else
+      print -r -- "error"
+      failed+=$platform
+    fi
+  done
+  (( $#failed )) || return 0
+  print
+  print -r -- "Error logs:"
+  print
+  for platform in $failed; do
+    print -r -- "  $platform => $logs/$platform"
+  done
+  return 1
+}
+
+# Copied from https://github.com/romkatv/run-process-tree.
+function run-process-tree() {
+  zmodload zsh/parameter zsh/param/private || return
+  local -P opt=(${(kv)options[@]})         || return
+  local -P pat=(${patchars[@]})            || return
+  local -P dis_pat=(${dis_patchars[@]})    || return
+  emulate -L zsh -o err_return             || return
+  setopt monitor traps_async pipe_fail no_unset
+  zmodload zsh/system
+
+  if (( $# == 0 )); then
+    print -ru2 -- 'usage: run-process-tree command [arg]...'
+    return 1
+  fi
+
+  local -P stdout REPLY
+  exec {stdout}>&1
+  {
+    {
+      local -Pi pipe
+      local -P gid=$sysparams[pid]
+      local -P sig=(ABRT EXIT HUP ILL INT PIPE QUIT TERM ZERR)
+      local -P trap=(trap "trap - $sig; kill -- -$sysparams[pid]" $sig)
+
+      exec {pipe}>&1 1>&$stdout
+      $trap
+
+      {
+        $trap
+        while sleep 1 && print -u $pipe .; do; done
+      } 2>/dev/null &
+      local -Pi watchdog=$!
+
+      {
+        trap - ZERR
+        exec {pipe}>&-
+        enable -p -- $pat
+        disable -p -- $dis_pat
+        options=($opt zle off monitor off)
+        "$@"
+      } &
+      local -Pi ret
+      wait $! || ret=$?
+
+      trap "exit $ret" TERM
+      kill $watchdog
+      wait $watchdog
+      return ret
+    } | while read; do; done || return
+  } always {
+    exec {stdout}>&-
+  }
+}
+
+mkdir -p -- $logs $locks $binaries
+
+() {
+  run-process-tree mbuild $@
+  exit
+} "$@"

gitstatus/pull-upstream.zsh

@@ -1,28 +0,0 @@
-#!/usr/bin/zsh
-
-emulate -L zsh
-setopt err_exit no_unset pipe_fail extended_glob xtrace
-
-: ${GITSTATUS_DIR:=${${(%):-%x}:A:h}}
-: ${GITSTATUS_URL:=https://github.com/romkatv/gitstatus.git}
-
-readonly GITSTATUS_DIR GITSTATUS_URL
-readonly -a IGNORE=(pull-upstream.zsh README.md)
-
-() {
-  local repo && repo="$(mktemp -d ${TMPDIR:-/tmp}/gitstatus-pull-upstream.XXXXXXXXXX)"
-  trap "rm -rf ${(q)repo}" EXIT
-  git clone --depth 1 $GITSTATUS_URL $repo
-
-  local dst
-  for dst in $GITSTATUS_DIR/**/*(.,@); do
-    local f=${dst#$GITSTATUS_DIR/}
-    (( ! ${IGNORE[(I)$f]} )) || continue
-    local src=$repo/$f
-    [[ -f $src ]] && {
-      mkdir -p ${dst:h} && cp -f $src $dst || return
-    } || {
-      rm -f $dst
-    }
-  done
-}

gitstatus/src/algorithm.h

@@ -0,0 +1,37 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_ALGORITHM_H_
+#define ROMKATV_GITSTATUS_ALGORITHM_H_
+
+#include <algorithm>
+
+namespace gitstatus {
+
+// Requires: Iter is a BidirectionalIterator.
+//
+// Returns iterator pointing to the last value in [begin, end) that compares equal to the value, or
+// begin if none compare equal.
+template <class Iter, class T>
+Iter FindLast(Iter begin, Iter end, const T& val) {
+  while (begin != end && !(*--end == val)) {}
+  return end;
+}
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_ALGORITHM_H_

gitstatus/src/arena.cc

@@ -0,0 +1,118 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "arena.h"
+
+#include <algorithm>
+#include <type_traits>
+
+#include "bits.h"
+#include "check.h"
+
+namespace gitstatus {
+
+namespace {
+
+size_t Clamp(size_t min, size_t val, size_t max) { return std::min(max, std::max(min, val)); }
+
+static const uintptr_t kSingularity = reinterpret_cast<uintptr_t>(&kSingularity);
+
+}  // namespace
+
+// Triple singularity. We are all fucked.
+Arena::Block Arena::g_empty_block = {kSingularity, kSingularity, kSingularity};
+
+Arena::Arena(Arena::Options opt) : opt_(std::move(opt)), top_(&g_empty_block) {
+  CHECK(opt_.min_block_size <= opt_.max_block_size);
+}
+
+Arena::Arena(Arena&& other) : Arena() { *this = std::move(other); }
+
+Arena::~Arena() {
+  // See comments in Makefile for the reason sized deallocation is not used.
+  for (const Block& b : blocks_) ::operator delete(reinterpret_cast<void*>(b.start));
+}
+
+Arena& Arena::operator=(Arena&& other) {
+  if (this != &other) {
+    // In case std::vector ever gets small object optimization.
+    size_t idx = other.reusable_ ? other.top_ - other.blocks_.data() : 0;
+    opt_ = other.opt_;
+    blocks_ = std::move(other.blocks_);
+    reusable_ = other.reusable_;
+    top_ = reusable_ ? blocks_.data() + idx : &g_empty_block;
+    other.blocks_.clear();
+    other.reusable_ = 0;
+    other.top_ = &g_empty_block;
+  }
+  return *this;
+}
+
+void Arena::Reuse(size_t num_blocks) {
+  reusable_ = std::min(reusable_, num_blocks);
+  for (size_t i = reusable_; i != blocks_.size(); ++i) {
+    const Block& b = blocks_[i];
+    // See comments in Makefile for the reason sized deallocation is not used.
+    ::operator delete(reinterpret_cast<void*>(b.start));
+  }
+  blocks_.resize(reusable_);
+  if (reusable_) {
+    top_ = blocks_.data();
+    top_->tip = top_->start;
+  } else {
+    top_ = &g_empty_block;
+  }
+}
+
+void Arena::AddBlock(size_t size, size_t alignment) {
+  if (alignment > alignof(std::max_align_t)) {
+    size += alignment - 1;
+  } else {
+    size = std::max(size, alignment);
+  }
+  if (size <= top_->size() && top_ < blocks_.data() + reusable_ - 1) {
+    assert(blocks_.front().size() == top_->size());
+    ++top_;
+    top_->tip = top_->start;
+    return;
+  }
+  if (size <= opt_.max_alloc_threshold) {
+    size =
+        std::max(size, Clamp(opt_.min_block_size, NextPow2(top_->size() + 1), opt_.max_block_size));
+  }
+
+  auto p = reinterpret_cast<uintptr_t>(::operator new(size));
+  blocks_.push_back(Block{p, p, p + size});
+  if (reusable_) {
+    if (size < blocks_.front().size()) {
+      top_ = &blocks_.back();
+      return;
+    }
+    if (size > blocks_.front().size()) reusable_ = 0;
+  }
+  std::swap(blocks_.back(), blocks_[reusable_]);
+  top_ = &blocks_[reusable_++];
+}
+
+void* Arena::AllocateSlow(size_t size, size_t alignment) {
+  assert(alignment && !(alignment & (alignment - 1)));
+  AddBlock(size, alignment);
+  assert(Align(top_->tip, alignment) + size <= top_->end);
+  return Allocate(size, alignment);
+}
+
+}  // namespace gitstatus

gitstatus/src/arena.h

@@ -0,0 +1,273 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_ARENA_H_
+#define ROMKATV_GITSTATUS_ARENA_H_
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <limits>
+#include <new>
+#include <type_traits>
+#include <vector>
+
+#include "string_view.h"
+
+namespace gitstatus {
+
+// Thread-compatible. Very fast and very flexible w.r.t. allocation size and alignment.
+//
+// Natural API extensions:
+//
+//   // Donates a block to the arena. When the time comes, it'll be freed with
+//   // free(p, size, userdata).
+//   void Donate(void* p, size_t size, void* userdata, void(*free)(void*, size_t, void*));
+class Arena {
+ public:
+  struct Options {
+    // The first call to Allocate() will allocate a block of this size. There is one exception when
+    // the first requested allocation size is larger than this limit. Subsequent blocks will be
+    // twice as large as the last until they saturate at max_block_size.
+    size_t min_block_size = 64;
+
+    // Allocate blocks at most this large. There is one exception when the requested allocation
+    // size is larger than this limit.
+    size_t max_block_size = 8 << 10;
+
+    // When the size of the first allocation in a block is larger than this threshold, the block
+    // size will be equal to the allocation size. This is meant to reduce memory waste when making
+    // many allocations with sizes slightly over max_block_size / 2. With max_alloc_threshold equal
+    // to max_block_size / N, the upper bound on wasted memory when making many equally-sized
+    // allocations is 100.0 / (N + 1) percent. When making allocations of different sizes, the upper
+    // bound on wasted memory is 50%.
+    size_t max_alloc_threshold = 1 << 10;
+
+    // Natural extensions:
+    //
+    //   void* userdata;
+    //   void (*alloc)(size_t size, size_t alignment, void* userdata);
+    //   void (*free)(void* p, size_t size, void* userdata);
+  };
+
+  // Requires: opt.min_block_size <= opt.max_block_size.
+  //
+  // Doesn't allocate any memory.
+  Arena(Options opt);
+  Arena() : Arena(Options()) {}
+  Arena(Arena&&);
+  ~Arena();
+
+  Arena& operator=(Arena&& other);
+
+  // Requires: alignment is a power of 2.
+  //
+  // Result is never null and always aligned. If size is zero, the result may be equal to the last.
+  // Alignment above alignof(std::max_align_t) is supported. There is no requirement for alignment
+  // to be less than size or to divide it.
+  inline void* Allocate(size_t size, size_t alignment) {
+    assert(alignment && !(alignment & (alignment - 1)));
+    uintptr_t p = Align(top_->tip, alignment);
+    uintptr_t e = p + size;
+    if (e <= top_->end) {
+      top_->tip = e;
+      return reinterpret_cast<void*>(p);
+    }
+    return AllocateSlow(size, alignment);
+  }
+
+  template <class T>
+  inline T* Allocate(size_t n) {
+    static_assert(!std::is_reference<T>(), "");
+    return static_cast<T*>(Allocate(n * sizeof(T), alignof(T)));
+  }
+
+  template <class T>
+  inline T* Allocate() {
+    return Allocate<T>(1);
+  }
+
+  inline char* MemDup(const char* p, size_t len) {
+    char* res = Allocate<char>(len);
+    std::memcpy(res, p, len);
+    return res;
+  }
+
+  // Copies the null-terminated string (including the trailing null character) to the arena and
+  // returns a pointer to the copy.
+  inline char* StrDup(const char* s) {
+    size_t len = std::strlen(s);
+    return MemDup(s, len + 1);
+  }
+
+  // Guarantees: !StrDup(p, len)[len].
+  inline char* StrDup(const char* p, size_t len) {
+    char* res = Allocate<char>(len + 1);
+    std::memcpy(res, p, len);
+    res[len] = 0;
+    return res;
+  }
+
+  // Guarantees: !StrDup(s)[s.len].
+  inline char* StrDup(StringView s) {
+    return StrDup(s.ptr, s.len);
+  }
+
+  template <class... Ts>
+  inline char* StrCat(const Ts&... ts) {
+    return [&](std::initializer_list<StringView> ss) {
+      size_t len = 0;
+      for (StringView s : ss) len += s.len;
+      char* p = Allocate<char>(len + 1);
+      for (StringView s : ss) {
+        std::memcpy(p, s.ptr, s.len);
+        p += s.len;
+      }
+      *p = 0;
+      return p - len;
+    }({ts...});
+  }
+
+  // Copies/moves `val` to the arena and returns a pointer to it.
+  template <class T>
+  inline std::remove_const_t<std::remove_reference_t<T>>* Dup(T&& val) {
+    return DirectInit<std::remove_const_t<std::remove_reference_t<T>>>(std::forward<T>(val));
+  }
+
+  // The same as `new T{args...}` but on the arena.
+  template <class T, class... Args>
+  inline T* DirectInit(Args&&... args) {
+    T* res = Allocate<T>();
+    ::new (const_cast<void*>(static_cast<const void*>(res))) T(std::forward<Args>(args)...);
+    return res;
+  }
+
+  // The same as `new T(args...)` but on the arena.
+  template <class T, class... Args>
+  inline T* BraceInit(Args&&... args) {
+    T* res = Allocate<T>();
+    ::new (const_cast<void*>(static_cast<const void*>(res))) T{std::forward<Args>(args)...};
+    return res;
+  }
+
+  // Tip() and TipSize() allow you to allocate the remainder of the current block. They can be
+  // useful if you are flexible w.r.t. the allocation size.
+  //
+  // Invariant:
+  //
+  //   const void* tip = Tip();
+  //   void* p = Allocate(TipSize(), 1);  // grab the remainder of the current block
+  //   assert(p == tip);
+  const void* Tip() const { return reinterpret_cast<const void*>(top_->tip); }
+  size_t TipSize() const { return top_->end - top_->tip; }
+
+  // Invalidates all allocations (without running destructors of allocated objects) and frees all
+  // blocks except at most the specified number of blocks. The retained blocks will be used to
+  // fulfil future allocation requests.
+  void Reuse(size_t num_blocks = std::numeric_limits<size_t>::max());
+
+ private:
+  struct Block {
+    size_t size() const { return end - start; }
+    uintptr_t start;
+    uintptr_t tip;
+    uintptr_t end;
+  };
+
+  inline static size_t Align(size_t n, size_t m) { return (n + m - 1) & ~(m - 1); };
+
+  void AddBlock(size_t size, size_t alignment);
+  bool ReuseBlock(size_t size, size_t alignment);
+
+  __attribute__((noinline)) void* AllocateSlow(size_t size, size_t alignment);
+
+  Options opt_;
+  std::vector<Block> blocks_;
+  // Invariant: !blocks_.empty() <= reusable_ && reusable_ <= blocks_.size().
+  size_t reusable_ = 0;
+  // Invariant: (top_ == &g_empty_block) == blocks_.empty().
+  // Invariant: blocks_.empty() || top_ == &blocks_.back() || top_ < blocks_.data() + reusable_.
+  Block* top_;
+
+  static Block g_empty_block;
+};
+
+// Copies of ArenaAllocator use the same thread-compatible Arena without synchronization.
+template <class T>
+class ArenaAllocator {
+ public:
+  using value_type = T;
+  using pointer = T*;
+  using const_pointer = const T*;
+  using reference = T&;
+  using const_reference = const T&;
+  using size_type = size_t;
+  using difference_type = ptrdiff_t;
+  using propagate_on_container_move_assignment = std::true_type;
+  template <class U>
+  struct rebind {
+    using other = ArenaAllocator<U>;
+  };
+  using is_always_equal = std::false_type;
+
+  ArenaAllocator(Arena* arena = nullptr) : arena_(*arena) {}
+
+  Arena& arena() const { return arena_; }
+
+  pointer address(reference x) const { return &x; }
+  const_pointer address(const_reference x) const { return &x; }
+  pointer allocate(size_type n, const void* hint = nullptr) { return arena_.Allocate<T>(n); }
+  void deallocate(T* p, std::size_t n) {}
+  size_type max_size() const { return std::numeric_limits<size_type>::max() / sizeof(value_type); }
+
+  template <class U, class... Args>
+  void construct(U* p, Args&&... args) {
+    ::new (const_cast<void*>(static_cast<const void*>(p))) U(std::forward<Args>(args)...);
+  }
+
+  template <class U>
+  void destroy(U* p) {
+    p->~U();
+  }
+
+  bool operator==(const ArenaAllocator& other) const { return &arena_ == &other.arena_; }
+  bool operator!=(const ArenaAllocator& other) const { return &arena_ != &other.arena_; }
+
+ private:
+  Arena& arena_;
+};
+
+template <class C>
+struct LazyWithArena;
+
+template <template <class, class> class C, class T1, class A>
+struct LazyWithArena<C<T1, A>> {
+  using type = C<T1, ArenaAllocator<typename C<T1, A>::value_type>>;
+};
+
+template <template <class, class, class> class C, class T1, class T2, class A>
+struct LazyWithArena<C<T1, T2, A>> {
+  using type = C<T1, T2, ArenaAllocator<typename C<T1, T2, A>::value_type>>;
+};
+
+template <class C>
+using WithArena = typename LazyWithArena<C>::type;
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_DIR_H_

gitstatus/src/bits.h

@@ -0,0 +1,29 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_BITS_H_
+#define ROMKATV_GITSTATUS_BITS_H_
+
+#include <cstddef>
+
+namespace gitstatus {
+
+inline size_t NextPow2(size_t n) { return n < 2 ? 1 : (~size_t{0} >> __builtin_clzll(n - 1)) + 1; }
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_BITS_H_

gitstatus/src/check.h

@@ -0,0 +1,61 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_CHECK_H_
+#define ROMKATV_GITSTATUS_CHECK_H_
+
+#include "logging.h"
+
+#include <stdexcept>
+
+// The argument must be an expression convertible to bool.
+// Does nothing if the expression evaluates to true. Otherwise
+// it's equivalent to LOG(FATAL).
+#define CHECK(cond...) \
+  static_cast<void>(0), (!!(cond)) ? static_cast<void>(0) : LOG(FATAL) << #cond << ": "
+
+#define VERIFY(cond...)                                               \
+  static_cast<void>(0), ::gitstatus::internal_check::Thrower(!(cond)) \
+                            ? static_cast<void>(0)                    \
+                            : LOG(ERROR) << #cond << ": "
+
+namespace gitstatus {
+
+struct Exception : std::exception {
+  const char* what() const noexcept override { return "Exception"; }
+};
+
+namespace internal_check {
+
+class Thrower {
+ public:
+  Thrower(bool should_throw) : throw_(should_throw) {}
+  Thrower(Thrower&&) = delete;
+  explicit operator bool() const { return !throw_; }
+  ~Thrower() noexcept(false) {
+    if (throw_) throw Exception();
+  }
+
+ private:
+  bool throw_;
+};
+
+}  // namespace internal_check
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_CHECK_H_

gitstatus/src/check_dir_mtime.cc

@@ -0,0 +1,157 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "check_dir_mtime.h"
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <cerrno>
+#include <cstring>
+#include <ctime>
+#include <string>
+#include <vector>
+
+#include "check.h"
+#include "dir.h"
+#include "logging.h"
+#include "print.h"
+#include "scope_guard.h"
+#include "stat.h"
+
+namespace gitstatus {
+
+namespace {
+
+constexpr char kDirPrefix[] = ".gitstatus.";
+
+void Touch(const char* path) {
+  int fd = creat(path, 0444);
+  VERIFY(fd >= 0) << Errno();
+  CHECK(!close(fd)) << Errno();
+}
+
+bool StatChanged(const char* path, const struct stat& prev) {
+  struct stat cur;
+  VERIFY(!lstat(path, &cur)) << Errno();
+  return !StatEq(prev, cur);
+}
+
+void RemoveStaleDirs(const char* root_dir) {
+  int dir_fd = open(root_dir, O_DIRECTORY | O_CLOEXEC);
+  if (dir_fd < 0) return;
+  ON_SCOPE_EXIT(&) { CHECK(!close(dir_fd)) << Errno(); };
+
+  Arena arena;
+  std::vector<char*> entries;
+  const std::time_t now = std::time(nullptr);
+  if (!ListDir(dir_fd, arena, entries,
+               /* precompose_unicode = */ false,
+               /* case_sensitive = */ true)) {
+    return;
+  }
+
+  std::string path = root_dir;
+  const size_t root_dir_len = path.size();
+
+  for (const char* entry : entries) {
+    if (std::strlen(entry) < std::strlen(kDirPrefix)) continue;
+    if (std::memcmp(entry, kDirPrefix, std::strlen(kDirPrefix))) continue;
+
+    struct stat st;
+    if (fstatat(dir_fd, entry, &st, AT_SYMLINK_NOFOLLOW)) {
+      LOG(WARN) << "Cannot stat " << Print(entry) << " in " << Print(root_dir) << ": " << Errno();
+      continue;
+    }
+    if (MTim(st).tv_sec + 10 > now) continue;
+
+    path.resize(root_dir_len);
+    path += entry;
+    size_t dir_len = path.size();
+
+    path += "/b/1";
+    if (unlink(path.c_str()) && errno != ENOENT) {
+      LOG(WARN) << "Cannot unlink " << Print(path) << ": " << Errno();
+      continue;
+    }
+
+    for (const char* d : {"/a/1", "/a", "/b", ""}) {
+      path.resize(dir_len);
+      path += d;
+      if (rmdir(path.c_str()) && errno != ENOENT) {
+        LOG(WARN) << "Cannot remove " << Print(path) << ": " << Errno();
+        break;
+      }
+    }
+  }
+}
+
+}  // namespace
+
+bool CheckDirMtime(const char* root_dir) {
+  try {
+    RemoveStaleDirs(root_dir);
+
+    std::string tmp = std::string() + root_dir + kDirPrefix + "XXXXXX";
+    VERIFY(mkdtemp(&tmp[0])) << Errno();
+    ON_SCOPE_EXIT(&) { rmdir(tmp.c_str()); };
+
+    std::string a_dir = tmp + "/a";
+    VERIFY(!mkdir(a_dir.c_str(), 0755)) << Errno();
+    ON_SCOPE_EXIT(&) { rmdir(a_dir.c_str()); };
+    struct stat a_st;
+    VERIFY(!lstat(a_dir.c_str(), &a_st)) << Errno();
+
+    std::string b_dir = tmp + "/b";
+    VERIFY(!mkdir(b_dir.c_str(), 0755)) << Errno();
+    ON_SCOPE_EXIT(&) { rmdir(b_dir.c_str()); };
+    struct stat b_st;
+    VERIFY(!lstat(b_dir.c_str(), &b_st)) << Errno();
+
+    while (sleep(1)) {
+      // zzzz
+    }
+
+    std::string a1 = a_dir + "/1";
+    VERIFY(!mkdir(a1.c_str(), 0755)) << Errno();
+    ON_SCOPE_EXIT(&) { rmdir(a1.c_str()); };
+    if (!StatChanged(a_dir.c_str(), a_st)) {
+      LOG(WARN) << "Creating a directory doesn't change mtime of the parent: " << Print(root_dir);
+      return false;
+    }
+
+    std::string b1 = b_dir + "/1";
+    Touch(b1.c_str());
+    ON_SCOPE_EXIT(&) { unlink(b1.c_str()); };
+    if (!StatChanged(b_dir.c_str(), b_st)) {
+      LOG(WARN) << "Creating a file doesn't change mtime of the parent: " << Print(root_dir);
+      return false;
+    }
+
+    LOG(INFO) << "All mtime checks have passes. Enabling untracked cache: " << Print(root_dir);
+    return true;
+  } catch (const Exception&) {
+    LOG(WARN) << "Error while testing for mtime capability: " << Print(root_dir);
+    return false;
+  }
+}
+
+}  // namespace gitstatus

gitstatus/src/check_dir_mtime.h

@@ -0,0 +1,31 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_CHECK_DIR_MTIME_H_
+#define ROMKATV_GITSTATUS_CHECK_DIR_MTIME_H_
+
+namespace gitstatus {
+
+// Similar to `git update-index --test-untracked-cache` but performs all tests
+// in parallel, so the total testing time is one second regardless of the number
+// of tests. It also performs fewer tests because gitstatus imposes fewer
+// requirements on the filesystem in order to take advantage of untracked cache.
+bool CheckDirMtime(const char* root_dir);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_CHECK_DIR_MTIME_H_

gitstatus/src/dir.cc

@@ -0,0 +1,237 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "dir.h"
+
+#include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <cstring>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#ifdef __linux__
+#include <endian.h>
+#include <sys/syscall.h>
+#endif
+
+#ifdef __APPLE__
+#include <iconv.h>
+#endif
+
+#include "bits.h"
+#include "check.h"
+#include "scope_guard.h"
+#include "string_cmp.h"
+#include "tribool.h"
+
+namespace gitstatus {
+
+namespace {
+
+bool Dots(const char* name) {
+  if (name[0] == '.') {
+    if (name[1] == 0) return true;
+    if (name[1] == '.' && name[2] == 0) return true;
+  }
+  return false;
+}
+
+}  // namespace
+
+// The linux-specific implementation is about 20% faster than the generic (posix) implementation.
+#ifdef __linux__
+
+uint64_t Read64(const void* p) {
+  uint64_t res;
+  std::memcpy(&res, p, 8);
+  return res;
+}
+
+void Write64(uint64_t x, void* p) { std::memcpy(p, &x, 8); }
+
+void SwapBytes(char** begin, char** end) {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+  for (; begin != end; ++begin) Write64(__builtin_bswap64(Read64(*begin)), *begin);
+#elif __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
+#error "sorry, not implemented"
+#endif
+}
+
+template <bool kCaseSensitive>
+void SortEntries(char** begin, char** end) {
+  static_assert(kCaseSensitive, "");
+  SwapBytes(begin, end);
+  std::sort(begin, end, [](const char* a, const char* b) {
+    uint64_t x = Read64(a);
+    uint64_t y = Read64(b);
+    // Add 5 for good luck.
+    return x < y || (x == y && std::memcmp(a + 5, b + 5, 256) < 0);
+  });
+  SwapBytes(begin, end);
+}
+
+template <>
+void SortEntries<false>(char** begin, char** end) {
+  std::sort(begin, end, StrLt<false>());
+}
+
+bool ListDir(int dir_fd, Arena& arena, std::vector<char*>& entries, bool precompose_unicode,
+             bool case_sensitive) {
+  struct linux_dirent64 {
+    ino64_t d_ino;
+    off64_t d_off;
+    unsigned short d_reclen;
+    unsigned char d_type;
+    char d_name[];
+  };
+
+  constexpr size_t kBufSize = 8 << 10;
+  const size_t orig_size = entries.size();
+
+  while (true) {
+    char* buf = static_cast<char*>(arena.Allocate(kBufSize, alignof(linux_dirent64)));
+    // Save 256 bytes for the rainy day.
+    int n = syscall(SYS_getdents64, dir_fd, buf, kBufSize - 256);
+    if (n < 0) {
+      entries.resize(orig_size);
+      return false;
+    }
+    for (int pos = 0; pos < n;) {
+      auto* ent = reinterpret_cast<linux_dirent64*>(buf + pos);
+      if (!Dots(ent->d_name)) entries.push_back(ent->d_name);
+      pos += ent->d_reclen;
+    }
+    if (n == 0) break;
+    // The following optimization relies on SYS_getdents64 always returning as many
+    // entries as would fit. This is not guaranteed by the specification and I don't
+    // know if this is true in practice. The optimization has no measurable effect on
+    // gitstatus performance, so it's turned off.
+    //
+    //   if (n + sizeof(linux_dirent64) + 512 <= kBufSize) break;
+  }
+
+  if (case_sensitive) {
+    SortEntries<true>(entries.data() + orig_size, entries.data() + entries.size());
+  } else {
+    SortEntries<false>(entries.data() + orig_size, entries.data() + entries.size());
+  }
+
+  return true;
+}
+
+#else  // __linux__
+
+namespace {
+
+char* DirentDup(Arena& arena, const struct dirent& ent, size_t len) {
+  char* p = arena.Allocate<char>(len + 2);
+  *p++ = ent.d_type;
+  std::memcpy(p, ent.d_name, len + 1);
+  return p;
+}
+
+#ifdef __APPLE__
+
+std::atomic<bool> g_iconv_error(true);
+
+Tribool IConvTry(char* inp, size_t ins, char* outp, size_t outs) {
+  if (outs == 0) return Tribool::kUnknown;
+  iconv_t ic = iconv_open("UTF-8", "UTF-8-MAC");
+  if (ic == (iconv_t)-1) {
+    if (g_iconv_error.load(std::memory_order_relaxed) &&
+        g_iconv_error.exchange(false, std::memory_order_relaxed)) {
+      LOG(ERROR) << "iconv_open(\"UTF-8\", \"UTF-8-MAC\") failed";
+    }
+    return Tribool::kFalse;
+  }
+  ON_SCOPE_EXIT(&) { CHECK(iconv_close(ic) == 0) << Errno(); };
+  --outs;
+  if (iconv(ic, &inp, &ins, &outp, &outs) >= 0) {
+    *outp = 0;
+    return Tribool::kTrue;
+  }
+  return errno == E2BIG ? Tribool::kUnknown : Tribool::kFalse;
+}
+
+char* DirenvConvert(Arena& arena, struct dirent& ent, bool do_convert) {
+  if (!do_convert) return DirentDup(arena, ent, std::strlen(ent.d_name));
+
+  size_t len = 0;
+  do_convert = false;
+  for (unsigned char c; (c = ent.d_name[len]); ++len) {
+    if (c & 0x80) do_convert = true;
+  }
+  if (!do_convert) return DirentDup(arena, ent, len);
+
+  size_t n = NextPow2(len + 2);
+  while (true) {
+    char* p = arena.Allocate<char>(n);
+    switch (IConvTry(ent.d_name, len, p + 1, n - 1)) {
+      case Tribool::kFalse:
+        return DirentDup(arena, ent, len);
+      case Tribool::kTrue:
+        *p = ent.d_type;
+        return p + 1;
+      case Tribool::kUnknown:
+        break;
+    }
+    n *= 2;
+  }
+}
+
+#else  // __APPLE__
+
+char* DirenvConvert(Arena& arena, struct dirent& ent, bool do_convert) {
+  return DirentDup(arena, ent, std::strlen(ent.d_name));
+}
+
+#endif  // __APPLE__
+
+}  // namespace
+
+bool ListDir(int dir_fd, Arena& arena, std::vector<char*>& entries, bool precompose_unicode,
+             bool case_sensitive) {
+  const size_t orig_size = entries.size();
+  dir_fd = dup(dir_fd);
+  if (dir_fd < 0) return false;
+  DIR* dir = fdopendir(dir_fd);
+  if (!dir) {
+    CHECK(!close(dir_fd)) << Errno();
+    return false;
+  }
+  ON_SCOPE_EXIT(&) { CHECK(!closedir(dir)) << Errno(); };
+  while (struct dirent* ent = (errno = 0, readdir(dir))) {
+    if (Dots(ent->d_name)) continue;
+    entries.push_back(DirenvConvert(arena, *ent, precompose_unicode));
+  }
+  if (errno) {
+    entries.resize(orig_size);
+    return false;
+  }
+  StrSort(entries.data() + orig_size, entries.data() + entries.size(), case_sensitive);
+  return true;
+}
+
+#endif  // __linux__
+
+}  // namespace gitstatus

gitstatus/src/dir.h

@@ -0,0 +1,50 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_DIR_H_
+#define ROMKATV_GITSTATUS_DIR_H_
+
+#include <cstddef>
+#include <vector>
+
+#include "arena.h"
+
+namespace gitstatus {
+
+// On error, leaves entries unchanged and returns false. Does not throw.
+//
+// On success, appends names of files from the specified directory to entries and returns true.
+// Every appended entry is a null-terminated string. At -1 offset is its d_type. All elements
+// point into the arena. They are sorted either by strcmp or strcasecmp depending on case_sensitive.
+//
+// Does not close dir_fd.
+//
+// There are two distinct implementations of ListDir -- one for Linux and another for everything
+// else. The linux-specific implementation is 20% faster.
+//
+// The reason sorting is bundled with directory listing is performance on Linux. The API of
+// getdents64 allows for much faster sorting than what can be done with a plain vector<char*>.
+// For the POSIX implementation there is no need to bundle sorting in this way. In fact, it's
+// done at the end with a generic StrSort() call.
+//
+// For best results, reuse the arena and vector for multiple calls to avoid heap allocations.
+bool ListDir(int dir_fd, Arena& arena, std::vector<char*>& entries, bool precompose_unicode,
+             bool case_sensitive);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_DIR_H_

gitstatus/src/git.cc

@@ -0,0 +1,250 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "git.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <sstream>
+#include <utility>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "arena.h"
+#include "check.h"
+#include "print.h"
+#include "scope_guard.h"
+
+namespace gitstatus {
+
+const char* GitError() {
+  const git_error* err = git_error_last();
+  return err && err->message ? err->message : "unknown error";
+}
+
+std::string RepoState(git_repository* repo) {
+  Arena arena;
+  StringView gitdir(git_repository_path(repo));
+
+  // These names mostly match gitaction in vcs_info:
+  // https://github.com/zsh-users/zsh/blob/master/Functions/VCS_Info/Backends/VCS_INFO_get_data_git.
+  auto State = [&]() {
+    switch (git_repository_state(repo)) {
+      case GIT_REPOSITORY_STATE_NONE:
+        return "";
+      case GIT_REPOSITORY_STATE_MERGE:
+        return "merge";
+      case GIT_REPOSITORY_STATE_REVERT:
+        return "revert";
+      case GIT_REPOSITORY_STATE_REVERT_SEQUENCE:
+        return "revert-seq";
+      case GIT_REPOSITORY_STATE_CHERRYPICK:
+        return "cherry";
+      case GIT_REPOSITORY_STATE_CHERRYPICK_SEQUENCE:
+        return "cherry-seq";
+      case GIT_REPOSITORY_STATE_BISECT:
+        return "bisect";
+      case GIT_REPOSITORY_STATE_REBASE:
+        return "rebase";
+      case GIT_REPOSITORY_STATE_REBASE_INTERACTIVE:
+        return "rebase-i";
+      case GIT_REPOSITORY_STATE_REBASE_MERGE:
+        return "rebase-m";
+      case GIT_REPOSITORY_STATE_APPLY_MAILBOX:
+        return "am";
+      case GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE:
+        return "am/rebase";
+    }
+    return "action";
+  };
+
+  auto DirExists = [&](StringView name) {
+    int fd = open(arena.StrCat(gitdir, "/", name), O_DIRECTORY | O_CLOEXEC);
+    if (fd < 0) return false;
+    CHECK(!close(fd)) << Errno();
+    return true;
+  };
+
+  auto ReadFile = [&](StringView name) {
+    std::ifstream strm(arena.StrCat(gitdir, "/", name));
+    std::string res;
+    strm >> res;
+    return res;
+  };
+
+  std::string next;
+  std::string last;
+
+  if (DirExists("rebase-merge")) {
+    next = ReadFile("rebase-merge/msgnum");
+    last = ReadFile("rebase-merge/end");
+  } else if (DirExists("rebase-apply")) {
+    next = ReadFile("rebase-apply/next");
+    last = ReadFile("rebase-apply/last");
+  }
+
+  std::ostringstream res;
+  res << State();
+  if (!next.empty() && !last.empty()) res << ' ' << next << '/' << last;
+  return res.str();
+}
+
+size_t CountRange(git_repository* repo, const std::string& range) {
+  git_revwalk* walk = nullptr;
+  VERIFY(!git_revwalk_new(&walk, repo)) << GitError();
+  ON_SCOPE_EXIT(=) { git_revwalk_free(walk); };
+  VERIFY(!git_revwalk_push_range(walk, range.c_str())) << GitError();
+  size_t res = 0;
+  while (true) {
+    git_oid oid;
+    switch (git_revwalk_next(&oid, walk)) {
+      case 0:
+        ++res;
+        break;
+      case GIT_ITEROVER:
+        return res;
+      default:
+        LOG(ERROR) << "git_revwalk_next: " << range << ": " << GitError();
+        throw Exception();
+    }
+  }
+}
+
+size_t NumStashes(git_repository* repo) {
+  size_t res = 0;
+  auto* cb = +[](size_t index, const char* message, const git_oid* stash_id, void* payload) {
+    ++*static_cast<size_t*>(payload);
+    return 0;
+  };
+  if (!git_stash_foreach(repo, cb, &res)) return res;
+  // Example error: failed to parse signature - malformed e-mail.
+  // See https://github.com/romkatv/powerlevel10k/issues/216.
+  LOG(WARN) << "git_stash_foreach: " << GitError();
+  return 0;
+}
+
+git_reference* Head(git_repository* repo) {
+  git_reference* symbolic = nullptr;
+  switch (git_reference_lookup(&symbolic, repo, "HEAD")) {
+    case 0:
+      break;
+    case GIT_ENOTFOUND:
+      return nullptr;
+    default:
+      LOG(ERROR) << "git_reference_lookup: " << GitError();
+      throw Exception();
+  }
+
+  git_reference* direct = nullptr;
+  if (git_reference_resolve(&direct, symbolic)) {
+    LOG(INFO) << "Empty git repo (no HEAD)";
+    return symbolic;
+  }
+  git_reference_free(symbolic);
+  return direct;
+}
+
+const char* LocalBranchName(const git_reference* ref) {
+  CHECK(ref);
+  git_reference_t type = git_reference_type(ref);
+  switch (type) {
+    case GIT_REFERENCE_DIRECT: {
+      return git_reference_is_branch(ref) ? git_reference_shorthand(ref) : "";
+    }
+    case GIT_REFERENCE_SYMBOLIC: {
+      static constexpr char kHeadPrefix[] = "refs/heads/";
+      const char* target = git_reference_symbolic_target(ref);
+      if (!target) return "";
+      size_t len = std::strlen(target);
+      if (len < sizeof(kHeadPrefix)) return "";
+      if (std::memcmp(target, kHeadPrefix, sizeof(kHeadPrefix) - 1)) return "";
+      return target + (sizeof(kHeadPrefix) - 1);
+    }
+    case GIT_REFERENCE_INVALID:
+    case GIT_REFERENCE_ALL:
+      break;
+  }
+  LOG(ERROR) << "Invalid reference type: " << type;
+  throw Exception();
+}
+
+RemotePtr GetRemote(git_repository* repo, const git_reference* local) {
+  git_remote* remote;
+  git_buf symref = {};
+  if (git_branch_remote(&remote, &symref, repo, git_reference_name(local))) return nullptr;
+  ON_SCOPE_EXIT(&) {
+    git_remote_free(remote);
+    git_buf_free(&symref);
+  };
+
+  git_reference* ref;
+  if (git_reference_lookup(&ref, repo, symref.ptr)) return nullptr;
+  ON_SCOPE_EXIT(&) { if (ref) git_reference_free(ref); };
+
+  const char* branch = nullptr;
+  std::string name = remote ? git_remote_name(remote) : ".";
+  if (git_branch_name(&branch, ref)) {
+    branch = "";
+  } else if (remote) {
+    VERIFY(std::strstr(branch, name.c_str()) == branch);
+    VERIFY(branch[name.size()] == '/');
+    branch += name.size() + 1;
+  }
+
+  auto res = std::make_unique<Remote>();
+  res->name = std::move(name);
+  res->branch = branch;
+  res->url = remote ? (git_remote_url(remote) ?: "") : "";
+  res->ref = std::exchange(ref, nullptr);
+  return RemotePtr(res.release());
+}
+
+PushRemotePtr GetPushRemote(git_repository* repo, const git_reference* local) {
+  git_remote* remote;
+  git_buf symref = {};
+  if (git_branch_push_remote(&remote, &symref, repo, git_reference_name(local))) return nullptr;
+  ON_SCOPE_EXIT(&) {
+    git_remote_free(remote);
+    git_buf_free(&symref);
+  };
+
+  git_reference* ref;
+  if (git_reference_lookup(&ref, repo, symref.ptr)) return nullptr;
+  ON_SCOPE_EXIT(&) { if (ref) git_reference_free(ref); };
+
+  std::string name = remote ? git_remote_name(remote) : ".";
+
+  auto res = std::make_unique<PushRemote>();
+  res->name = std::move(name);
+  res->url = remote ? (git_remote_url(remote) ?: "") : "";
+  res->ref = std::exchange(ref, nullptr);
+  return PushRemotePtr(res.release());
+}
+
+CommitMessage GetCommitMessage(git_repository* repo, const git_oid& id) {
+  git_commit* commit;
+  VERIFY(!git_commit_lookup(&commit, repo, &id)) << GitError();
+  ON_SCOPE_EXIT(=) { git_commit_free(commit); };
+  return {.encoding = git_commit_message_encoding(commit) ?: "",
+          .summary = git_commit_summary(commit) ?: ""};
+}
+
+}  // namespace gitstatus

gitstatus/src/git.h

@@ -0,0 +1,115 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_GIT_H_
+#define ROMKATV_GITSTATUS_GIT_H_
+
+#include <git2.h>
+
+#include <cstddef>
+#include <memory>
+#include <string>
+
+namespace gitstatus {
+
+// Not null.
+const char* GitError();
+
+// Not null.
+std::string RepoState(git_repository* repo);
+
+// Returns the number of commits in the range.
+size_t CountRange(git_repository* repo, const std::string& range);
+
+// How many stashes are there?
+size_t NumStashes(git_repository* repo);
+
+// Returns the origin URL or an empty string. Not null.
+std::string RemoteUrl(git_repository* repo, const git_reference* ref);
+
+// Returns reference to HEAD or null if not found. The reference is symbolic if the repo is empty
+// and direct otherwise.
+git_reference* Head(git_repository* repo);
+
+// Returns the name of the local branch, or an empty string.
+const char* LocalBranchName(const git_reference* ref);
+
+struct CommitMessage {
+  // Can be empty, meaning "UTF-8".
+  std::string encoding;
+  // The first paragraph of the commit's message as a one-liner.
+  std::string summary;
+};
+
+CommitMessage GetCommitMessage(git_repository* repo, const git_oid& id);
+
+struct Remote {
+  // Tip of the remote branch.
+  git_reference* ref;
+
+  // Name of the tracking remote. For example, "origin".
+  std::string name;
+
+  // Name of the tracking remote branch. For example, "master".
+  std::string branch;
+
+  // URL of the tracking remote. For example, "https://foo.com/repo.git".
+  std::string url;
+
+  // Note: pushurl is not exposed (but could be).
+
+  struct Free {
+    void operator()(const Remote* p) const {
+      if (p) {
+        if (p->ref) git_reference_free(p->ref);
+        delete p;
+      }
+    }
+  };
+};
+
+struct PushRemote {
+  // Tip of the remote branch.
+  git_reference* ref;
+
+  // Name of the tracking remote. For example, "origin".
+  std::string name;
+
+  // URL of the tracking remote. For example, "https://foo.com/repo.git".
+  std::string url;
+
+  // Note: pushurl is not exposed (but could be).
+
+  struct Free {
+    void operator()(const PushRemote* p) const {
+      if (p) {
+        if (p->ref) git_reference_free(p->ref);
+        delete p;
+      }
+    }
+  };
+};
+
+using RemotePtr = std::unique_ptr<Remote, Remote::Free>;
+using PushRemotePtr = std::unique_ptr<PushRemote, PushRemote::Free>;
+
+RemotePtr GetRemote(git_repository* repo, const git_reference* local);
+PushRemotePtr GetPushRemote(git_repository* repo, const git_reference* local);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_GIT_H_

gitstatus/src/gitstatus.cc

@@ -0,0 +1,219 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include <time.h>
+
+#include <cstddef>
+#include <future>
+#include <string>
+
+#include <git2.h>
+
+#include "check.h"
+#include "git.h"
+#include "logging.h"
+#include "options.h"
+#include "print.h"
+#include "repo.h"
+#include "repo_cache.h"
+#include "request.h"
+#include "response.h"
+#include "scope_guard.h"
+#include "thread_pool.h"
+#include "timer.h"
+
+namespace gitstatus {
+namespace {
+
+using namespace std::string_literals;
+
+void Truncate(std::string& s, size_t max_len) {
+  if (s.size() > max_len) s.resize(max_len);
+}
+
+void ProcessRequest(const Options& opts, RepoCache& cache, Request req) {
+  Timer timer;
+  ON_SCOPE_EXIT(&) { timer.Report("request"); };
+
+  ResponseWriter resp(req.id);
+  Repo* repo = cache.Open(req.dir, req.from_dotgit);
+  if (!repo) return;
+
+  git_config* cfg;
+  VERIFY(!git_repository_config(&cfg, repo->repo())) << GitError();
+  ON_SCOPE_EXIT(=) { git_config_free(cfg); };
+  VERIFY(!git_config_refresh(cfg)) << GitError();
+
+  // Symbolic reference if and only if the repo is empty.
+  git_reference* head = Head(repo->repo());
+  if (!head) return;
+  ON_SCOPE_EXIT(=) { git_reference_free(head); };
+
+  // Null if and only if the repo is empty.
+  const git_oid* head_target = git_reference_target(head);
+
+  // Looking up tags may take some time. Do it in the background while we check for stuff.
+  // Note that GetTagName() doesn't access index, so it'll overlap with index reading and
+  // parsing.
+  std::future<std::string> tag = repo->GetTagName(head_target);
+  ON_SCOPE_EXIT(&) {
+    if (tag.valid()) {
+      try {
+        tag.wait();
+      } catch (const Exception&) {
+      }
+    }
+  };
+
+  // Repository working directory. Absolute; no trailing slash. E.g., "/home/romka/gitstatus".
+  StringView workdir(git_repository_workdir(repo->repo()));
+  if (workdir.len == 0) return;
+  if (workdir.len > 1 && workdir.ptr[workdir.len - 1] == '/') --workdir.len;
+  resp.Print(workdir);
+
+  // Revision. Either 40 hex digits or an empty string for empty repo.
+  resp.Print(head_target ? git_oid_tostr_s(head_target) : "");
+
+  // Local branch name (e.g., "master") or empty string if not on a branch.
+  resp.Print(LocalBranchName(head));
+
+  // Remote tracking branch or null.
+  RemotePtr remote = GetRemote(repo->repo(), head);
+
+  // Tracking remote branch name (e.g., "master") or empty string if there is no tracking remote.
+  resp.Print(remote ? remote->branch : "");
+
+  // Tracking remote name (e.g., "origin") or empty string if there is no tracking remote.
+  resp.Print(remote ? remote->name : "");
+
+  // Tracking remote URL or empty string if there is no tracking remote.
+  resp.Print(remote ? remote->url : "");
+
+  // Repository state, A.K.A. action. For example, "merge".
+  resp.Print(RepoState(repo->repo()));
+
+  IndexStats stats;
+  // Look for staged, unstaged and untracked. This is where most of the time is spent.
+  if (req.diff) stats = repo->GetIndexStats(head_target, cfg);
+
+  // The number of files in the index.
+  resp.Print(stats.index_size);
+  // The number of staged changes. At most opts.max_num_staged.
+  resp.Print(stats.num_staged);
+  // The number of unstaged changes. At most opts.max_num_unstaged. 0 if index is too large.
+  resp.Print(stats.num_unstaged);
+  // The number of conflicted changes. At most opts.max_num_conflicted. 0 if index is too large.
+  resp.Print(stats.num_conflicted);
+  // The number of untracked changes. At most opts.max_num_untracked. 0 if index is too large.
+  resp.Print(stats.num_untracked);
+
+  if (remote && remote->ref) {
+    const char* ref = git_reference_name(remote->ref);
+    // Number of commits we are ahead of upstream. Non-negative integer.
+    resp.Print(CountRange(repo->repo(), ref + "..HEAD"s));
+    // Number of commits we are behind upstream. Non-negative integer.
+    resp.Print(CountRange(repo->repo(), "HEAD.."s + ref));
+  } else {
+    resp.Print("0");
+    resp.Print("0");
+  }
+
+  // Number of stashes. Non-negative integer.
+  resp.Print(NumStashes(repo->repo()));
+
+  // Tag that points to HEAD (e.g., "v4.2") or empty string if there aren't any. The same as
+  // `git describe --tags --exact-match`.
+  resp.Print(tag.get());
+
+  // The number of unstaged deleted files. At most stats.num_unstaged.
+  resp.Print(stats.num_unstaged_deleted);
+  // The number of staged new files. At most stats.num_staged.
+  resp.Print(stats.num_staged_new);
+  // The number of staged deleted files. At most stats.num_staged.
+  resp.Print(stats.num_staged_deleted);
+
+  // Push remote or null.
+  PushRemotePtr push_remote = GetPushRemote(repo->repo(), head);
+
+  // Push remote name (e.g., "origin") or empty string if there is no push remote.
+  resp.Print(push_remote ? push_remote->name : "");
+
+  // Push remote URL or empty string if there is no push remote.
+  resp.Print(push_remote ? push_remote->url : "");
+
+  if (push_remote && push_remote->ref) {
+    const char* ref = git_reference_name(push_remote->ref);
+    // Number of commits we are ahead of push remote. Non-negative integer.
+    resp.Print(CountRange(repo->repo(), ref + "..HEAD"s));
+    // Number of commits we are behind upstream. Non-negative integer.
+    resp.Print(CountRange(repo->repo(), "HEAD.."s + ref));
+  } else {
+    resp.Print("0");
+    resp.Print("0");
+  }
+
+  // The number of files in the index with skip-worktree bit set.
+  resp.Print(stats.num_skip_worktree);
+  // The number of files in the index with assume-unchanged bit set.
+  resp.Print(stats.num_assume_unchanged);
+
+  CommitMessage msg = head_target ? GetCommitMessage(repo->repo(), *head_target) : CommitMessage();
+  Truncate(msg.summary, opts.max_commit_summary_length);
+  resp.Print(msg.encoding);
+  resp.Print(msg.summary);
+
+  resp.Dump("with git status");
+}
+
+int GitStatus(int argc, char** argv) {
+  tzset();
+  Options opts = ParseOptions(argc, argv);
+  g_min_log_level = opts.log_level;
+  for (int i = 0; i != argc; ++i) LOG(INFO) << "argv[" << i << "]: " << Print(argv[i]);
+  RequestReader reader(fileno(stdin), opts.lock_fd, opts.parent_pid);
+  RepoCache cache(opts);
+
+  InitGlobalThreadPool(opts.num_threads);
+  git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 0);
+  git_libgit2_opts(GIT_OPT_DISABLE_INDEX_CHECKSUM_VERIFICATION, 1);
+  git_libgit2_opts(GIT_OPT_DISABLE_INDEX_FILEPATH_VALIDATION, 1);
+  git_libgit2_opts(GIT_OPT_DISABLE_READNG_PACKED_TAGS, 1);
+  git_libgit2_init();
+
+  while (true) {
+    try {
+      Request req;
+      if (reader.ReadRequest(req)) {
+        LOG(INFO) << "Processing request: " << req;
+        try {
+          ProcessRequest(opts, cache, req);
+          LOG(INFO) << "Successfully processed request: " << req;
+        } catch (const Exception&) {
+          LOG(ERROR) << "Error processing request: " << req;
+        }
+      } else if (opts.repo_ttl >= Duration()) {
+        cache.Free(Clock::now() - opts.repo_ttl);
+      }
+    } catch (const Exception&) {
+    }
+  }
+}
+
+}  // namespace
+}  // namespace gitstatus
+
+int main(int argc, char** argv) { gitstatus::GitStatus(argc, argv); }

gitstatus/src/index.cc

@@ -0,0 +1,456 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "index.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <condition_variable>
+#include <cstdint>
+#include <cstring>
+#include <iomanip>
+#include <iterator>
+#include <mutex>
+#include <stack>
+
+#include "algorithm.h"
+#include "check.h"
+#include "dir.h"
+#include "git.h"
+#include "index.h"
+#include "print.h"
+#include "scope_guard.h"
+#include "stat.h"
+#include "string_cmp.h"
+#include "thread_pool.h"
+
+namespace gitstatus {
+
+namespace {
+
+void CommonDir(Str<> str, const char* a, const char* b, size_t* dir_len, size_t* dir_depth) {
+  *dir_len = 0;
+  *dir_depth = 0;
+  for (size_t i = 1; str.Eq(*a, *b) && *a; ++i, ++a, ++b) {
+    if (*a == '/') {
+      *dir_len = i;
+      ++*dir_depth;
+    }
+  }
+}
+
+size_t Weight(const IndexDir& dir) { return 1 + dir.subdirs.size() + dir.files.size(); }
+
+bool MTimeEq(const git_index_time& index, const struct timespec& workdir) {
+  if (index.seconds != workdir.tv_sec) return false;
+  if (int64_t{index.nanoseconds} == workdir.tv_nsec) return true;
+#ifdef GITSTATUS_ZERO_NSEC
+  return index.nanoseconds == 0;
+#else
+  return false;
+#endif
+}
+
+bool IsModified(const git_index_entry* entry, const struct stat& st, const RepoCaps& caps) {
+  mode_t mode = st.st_mode;
+  if (S_ISREG(mode)) {
+    if (!caps.has_symlinks && S_ISLNK(entry->mode)) {
+      mode = entry->mode;
+    } else if (!caps.trust_filemode) {
+      mode = entry->mode;
+    } else {
+      mode = S_IFREG | (mode & 0100 ? 0755 : 0644);
+    }
+  } else {
+    mode &= S_IFMT;
+  }
+
+  bool res = false;
+
+#define COND(field, cond...) \
+  if (cond) {                \
+  } else                     \
+    res = true,              \
+    LOG(DEBUG) << "Dirty candidate (modified): " << Print(entry->path) << ": " #field " "
+
+  COND(ino, !entry->ino || entry->ino == static_cast<std::uint32_t>(st.st_ino))
+      << entry->ino << " => " << static_cast<std::uint32_t>(st.st_ino);
+
+  COND(stage, GIT_INDEX_ENTRY_STAGE(entry) == 0) << "=> " << GIT_INDEX_ENTRY_STAGE(entry);
+  COND(fsize, int64_t{entry->file_size} == st.st_size) << entry->file_size << " => " << st.st_size;
+  COND(mtime, MTimeEq(entry->mtime, MTim(st))) << Print(entry->mtime) << " => " << Print(MTim(st));
+  COND(mode, entry->mode == mode) << std::oct << entry->mode << " => " << std::oct << mode;
+
+#undef COND
+
+  return res;
+}
+
+int OpenDir(int parent_fd, const char* name) {
+  return openat(parent_fd, name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+}
+
+void OpenTail(int* fds, size_t nfds, int root_fd, StringView dirname, Arena& arena) {
+  CHECK(fds && nfds && root_fd >= 0);
+  std::fill(fds, fds + nfds, -1);
+  if (!dirname.len) return;
+  CHECK(dirname.len > 1);
+  CHECK(dirname.ptr[0] != '/');
+  CHECK(dirname.ptr[dirname.len - 1] == '/');
+
+  char* begin = arena.StrDup(dirname.ptr, dirname.len - 1);
+  WithArena<std::vector<const char*>> subdirs(&arena);
+  subdirs.reserve(nfds + 1);
+
+  for (char* sep = begin + dirname.len - 1; subdirs.size() < nfds;) {
+    sep = FindLast(begin, sep, '/');
+    if (sep == begin) break;
+    *sep = 0;
+    subdirs.push_back(sep + 1);
+  }
+  subdirs.push_back(begin);
+  if (subdirs.size() < nfds + 1) subdirs.push_back(".");
+  CHECK(subdirs.size() <= nfds + 1);
+
+  for (size_t i = subdirs.size(); i != 1; --i) {
+    const char* path = subdirs[i - 1];
+    if ((root_fd = OpenDir(root_fd, path)) < 0) {
+      for (; i != subdirs.size(); ++i) {
+        CHECK(!close(fds[i - 1])) << Errno();
+        fds[i - 1] = -1;
+      }
+      return;
+    }
+    fds[i - 2] = root_fd;
+  }
+}
+
+std::vector<const char*> ScanDirs(git_index* index, int root_fd, IndexDir* const* begin,
+                                  IndexDir* const* end, const RepoCaps& caps,
+                                  const ScanOpts& opts) {
+  const Str<> str(caps.case_sensitive);
+
+  Arena arena;
+  std::vector<const char*> dirty_candidates;
+  std::vector<char*> entries;
+  entries.reserve(128);
+
+  auto AddCandidate = [&](const char* kind, const char* path) {
+    if (kind) LOG(DEBUG) << "Dirty candidate (" << kind << "): " << Print(path);
+    dirty_candidates.push_back(path);
+  };
+
+  constexpr ssize_t kDirStackSize = 5;
+  int dir_fd[kDirStackSize];
+  std::fill(std::begin(dir_fd), std::end(dir_fd), -1);
+  auto Close = [](int& fd) {
+    if (fd >= 0) {
+      CHECK(!close(fd)) << Errno();
+      fd = -1;
+    }
+  };
+  auto CloseAll = [&] { std::for_each(std::begin(dir_fd), std::end(dir_fd), Close); };
+  ON_SCOPE_EXIT(&) { CloseAll(); };
+  if (begin != end) OpenTail(dir_fd, kDirStackSize, root_fd, (*begin)->path, arena);
+
+  for (IndexDir* const* it = begin; it != end; ++it) {
+    IndexDir& dir = **it;
+
+    auto Basename = [&](const git_index_entry* e) { return e->path + dir.path.len; };
+
+    auto AddUnmached = [&](StringView basename) {
+      if (!basename.len) {
+        dir.st = {};
+        dir.unmatched.clear();
+        dir.arena.Reuse();
+      } else if (str.Eq(basename, StringView(".git/"))) {
+        return;
+      }
+      char* path = dir.arena.StrCat(dir.path, basename);
+      dir.unmatched.push_back(path);
+      AddCandidate(basename.len ? "new" : "unreadable", path);
+    };
+
+    auto StatFiles = [&]() {
+      struct stat st;
+      for (const git_index_entry* file : dir.files) {
+        if (fstatat(*dir_fd, Basename(file), &st, AT_SYMLINK_NOFOLLOW)) {
+          AddCandidate(errno == ENOENT ? "deleted" : "unreadable", file->path);
+        } else if (IsModified(file, st, caps)) {
+          AddCandidate(nullptr, file->path);
+        }
+      }
+    };
+
+    ssize_t d = 0;
+    if ((it == begin || (d = it[-1]->depth + 1 - dir.depth) < kDirStackSize) && dir_fd[d] >= 0) {
+      CHECK(d >= 0);
+      int fd = OpenDir(dir_fd[d], arena.StrDup(dir.basename.ptr, dir.basename.len));
+      for (ssize_t i = 0; i != d; ++i) Close(dir_fd[i]);
+      std::rotate(dir_fd, dir_fd + (d ? d : kDirStackSize) - 1, dir_fd + kDirStackSize);
+      Close(*dir_fd);
+      *dir_fd = fd;
+    } else {
+      CloseAll();
+      if (dir.path.len) {
+        CHECK(dir.path.ptr[0] != '/');
+        CHECK(dir.path.ptr[dir.path.len - 1] == '/');
+        *dir_fd = OpenDir(root_fd, arena.StrDup(dir.path.ptr, dir.path.len - 1));
+      } else {
+        VERIFY((*dir_fd = dup(root_fd)) >= 0) << Errno();
+      }
+    }
+    if (*dir_fd < 0) {
+      CloseAll();
+      AddUnmached("");
+      continue;
+    }
+
+    if (!opts.include_untracked) {
+      StatFiles();
+      continue;
+    }
+
+    if (opts.untracked_cache != Tribool::kFalse) {
+      struct stat st;
+      if (fstat(*dir_fd, &st)) {
+        AddUnmached("");
+        continue;
+      }
+      if (opts.untracked_cache == Tribool::kTrue && StatEq(st, dir.st)) {
+        StatFiles();
+        for (const char* path : dir.unmatched) AddCandidate("new", path);
+        continue;
+      }
+      dir.st = st;
+    }
+
+    entries.clear();
+    arena.Reuse();
+    if (!ListDir(*dir_fd, arena, entries, caps.precompose_unicode, caps.case_sensitive)) {
+      AddUnmached("");
+      continue;
+    }
+    dir.unmatched.clear();
+    dir.arena.Reuse();
+
+    const git_index_entry* const* file = dir.files.data();
+    const git_index_entry* const* file_end = file + dir.files.size();
+    const StringView* subdir = dir.subdirs.data();
+    const StringView* subdir_end = subdir + dir.subdirs.size();
+
+    for (char* entry : entries) {
+      bool matched = false;
+
+      for (; file != file_end; ++file) {
+        int cmp = str.Cmp(Basename(*file), entry);
+        if (cmp < 0) {
+          AddCandidate("deleted", (*file)->path);
+        } else if (cmp == 0) {
+          struct stat st;
+          if (fstatat(*dir_fd, entry, &st, AT_SYMLINK_NOFOLLOW)) {
+            AddCandidate("unreadable", (*file)->path);
+          } else if (IsModified(*file, st, caps)) {
+            AddCandidate(nullptr, (*file)->path);
+          }
+          matched = true;
+          ++file;
+          break;
+        } else {
+          break;
+        }
+      }
+
+      if (matched) continue;
+
+      for (; subdir != subdir_end; ++subdir) {
+        int cmp = str.Cmp(*subdir, entry);
+        if (cmp > 0) break;
+        if (cmp == 0) {
+          matched = true;
+          ++subdir;
+          break;
+        }
+      }
+
+      if (!matched) {
+        StringView basename(entry);
+        if (entry[-1] == DT_DIR) entry[basename.len++] = '/';
+        AddUnmached(basename);
+      }
+    }
+
+    for (; file != file_end; ++file) AddCandidate("deleted", (*file)->path);
+  }
+
+  return dirty_candidates;
+}
+
+}  // namespace
+
+RepoCaps::RepoCaps(git_repository* repo, git_index* index) {
+  trust_filemode = git_index_is_filemode_trustworthy(index);
+  has_symlinks = git_index_supports_symlinks(index);
+  case_sensitive = git_index_is_case_sensitive(index);
+  precompose_unicode = git_index_precompose_unicode(index);
+  LOG(DEBUG) << "Repository capabilities for " << Print(git_repository_workdir(repo)) << ": "
+             << "is_filemode_trustworthy = " << std::boolalpha << trust_filemode << ", "
+             << "index_supports_symlinks = " << std::boolalpha << has_symlinks << ", "
+             << "index_is_case_sensitive = " << std::boolalpha << case_sensitive << ", "
+             << "precompose_unicode = " << std::boolalpha << precompose_unicode;
+}
+
+Index::Index(git_repository* repo, git_index* index)
+    : dirs_(&arena_),
+      splits_(&arena_),
+      git_index_(index),
+      root_dir_(git_repository_workdir(repo)),
+      caps_(repo, index) {
+  size_t total_weight = InitDirs(index);
+  InitSplits(total_weight);
+}
+
+size_t Index::InitDirs(git_index* index) {
+  const Str<> str(git_index_is_case_sensitive(index));
+  const size_t index_size = git_index_entrycount(index);
+  dirs_.reserve(index_size / 8);
+  std::stack<IndexDir*> stack;
+  stack.push(arena_.DirectInit<IndexDir>(&arena_));
+
+  size_t total_weight = 0;
+  auto PopDir = [&] {
+    CHECK(!stack.empty());
+    IndexDir* top = stack.top();
+    CHECK(top->depth + 1 == stack.size());
+    if (!std::is_sorted(top->subdirs.begin(), top->subdirs.end(), str.Lt)) {
+      StrSort(top->subdirs.begin(), top->subdirs.end(), str.case_sensitive);
+    }
+    total_weight += Weight(*top);
+    dirs_.push_back(top);
+    stack.pop();
+  };
+
+  for (size_t i = 0; i != index_size; ++i) {
+    const git_index_entry* entry = git_index_get_byindex_no_sort(index, i);
+    IndexDir* prev = stack.top();
+    size_t common_len, common_depth;
+    CommonDir(str, prev->path.ptr, entry->path, &common_len, &common_depth);
+    CHECK(common_depth <= prev->depth);
+
+    for (size_t i = common_depth; i != prev->depth; ++i) PopDir();
+
+    for (const char* p = entry->path + common_len; (p = std::strchr(p, '/')); ++p) {
+      IndexDir* top = stack.top();
+      StringView subdir(entry->path + top->path.len, p);
+      top->subdirs.push_back(subdir);
+      IndexDir* dir = arena_.DirectInit<IndexDir>(&arena_);
+      dir->path = StringView(entry->path, p - entry->path + 1);
+      dir->basename = subdir;
+      dir->depth = stack.size();
+      CHECK(dir->path.ptr[dir->path.len - 1] == '/');
+      stack.push(dir);
+    }
+
+    CHECK(!stack.empty());
+    IndexDir* dir = stack.top();
+    dir->files.push_back(entry);
+  }
+
+  CHECK(!stack.empty());
+  do {
+    PopDir();
+  } while (!stack.empty());
+  std::reverse(dirs_.begin(), dirs_.end());
+
+  return total_weight;
+}
+
+void Index::InitSplits(size_t total_weight) {
+  constexpr size_t kMinShardWeight = 512;
+  const size_t kNumShards = 16 * GlobalThreadPool()->num_threads();
+  const size_t shard_weight = std::max(kMinShardWeight, total_weight / kNumShards);
+
+  splits_.reserve(kNumShards + 1);
+  splits_.push_back(0);
+
+  for (size_t i = 0, w = 0; i != dirs_.size(); ++i) {
+    w += Weight(*dirs_[i]);
+    if (w >= shard_weight) {
+      w = 0;
+      splits_.push_back(i + 1);
+    }
+  }
+
+  if (splits_.back() != dirs_.size()) splits_.push_back(dirs_.size());
+  CHECK(splits_.size() <= kNumShards + 1);
+  CHECK(std::is_sorted(splits_.begin(), splits_.end()));
+  CHECK(std::adjacent_find(splits_.begin(), splits_.end()) == splits_.end());
+}
+
+std::vector<const char*> Index::GetDirtyCandidates(const ScanOpts& opts) {
+  int root_fd = open(root_dir_, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  VERIFY(root_fd >= 0);
+  ON_SCOPE_EXIT(&) { CHECK(!close(root_fd)) << Errno(); };
+
+  CHECK(!splits_.empty());
+
+  std::mutex mutex;
+  std::condition_variable cv;
+  size_t inflight = splits_.size() - 1;
+  bool error = false;
+  std::vector<const char*> res;
+
+  for (size_t i = 0; i != splits_.size() - 1; ++i) {
+    size_t from = splits_[i];
+    size_t to = splits_[i + 1];
+
+    GlobalThreadPool()->Schedule([&, from, to]() {
+      ON_SCOPE_EXIT(&) {
+        std::unique_lock<std::mutex> lock(mutex);
+        CHECK(inflight);
+        if (--inflight == 0) cv.notify_one();
+      };
+      try {
+        std::vector<const char*> candidates =
+            ScanDirs(git_index_, root_fd, dirs_.data() + from, dirs_.data() + to, caps_, opts);
+        if (!candidates.empty()) {
+          std::unique_lock<std::mutex> lock(mutex);
+          res.insert(res.end(), candidates.begin(), candidates.end());
+        }
+      } catch (const Exception&) {
+        std::unique_lock<std::mutex> lock(mutex);
+        error = true;
+      }
+    });
+  }
+
+  {
+    std::unique_lock<std::mutex> lock(mutex);
+    while (inflight) cv.wait(lock);
+  }
+
+  VERIFY(!error);
+  StrSort(res.begin(), res.end(), git_index_is_case_sensitive(git_index_));
+  auto StrEq = [](const char* a, const char* b) { return !strcmp(a, b); };
+  res.erase(std::unique(res.begin(), res.end(), StrEq), res.end());
+  return res;
+}
+
+}  // namespace gitstatus

gitstatus/src/index.h

@@ -0,0 +1,84 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_INDEX_H_
+#define ROMKATV_GITSTATUS_INDEX_H_
+
+#include <sys/stat.h>
+
+#include <git2.h>
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+#include "arena.h"
+#include "options.h"
+#include "string_view.h"
+#include "tribool.h"
+
+namespace gitstatus {
+
+struct RepoCaps {
+  RepoCaps(git_repository* repo, git_index* index);
+
+  bool trust_filemode;
+  bool has_symlinks;
+  bool case_sensitive;
+  bool precompose_unicode;
+};
+
+struct ScanOpts {
+  bool include_untracked;
+  Tribool untracked_cache;
+};
+
+struct IndexDir {
+  explicit IndexDir(Arena* arena) : files(arena), subdirs(arena) {}
+
+  StringView path;
+  StringView basename;
+  size_t depth = 0;
+  struct stat st = {};
+  WithArena<std::vector<const git_index_entry*>> files;
+  WithArena<std::vector<StringView>> subdirs;
+
+  Arena arena;
+  std::vector<const char*> unmatched;
+};
+
+class Index {
+ public:
+  Index(git_repository* repo, git_index* index);
+
+  std::vector<const char*> GetDirtyCandidates(const ScanOpts& opts);
+
+ private:
+  size_t InitDirs(git_index* index);
+  void InitSplits(size_t total_weight);
+
+  Arena arena_;
+  WithArena<std::vector<IndexDir*>> dirs_;
+  WithArena<std::vector<size_t>> splits_;
+  git_index* git_index_;
+  const char* root_dir_;
+  RepoCaps caps_;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_GIT_H_

gitstatus/src/logging.cc

@@ -0,0 +1,139 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "logging.h"
+
+#include <pthread.h>
+#include <time.h>
+
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include <ctime>
+#include <mutex>
+#include <string>
+
+namespace gitstatus {
+
+namespace internal_logging {
+
+namespace {
+
+std::mutex g_log_mutex;
+
+constexpr char kHexLower[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+                              '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+void FormatThreadId(char (&out)[2 * sizeof(std::uintptr_t) + 1]) {
+  std::uintptr_t tid = (std::uintptr_t)pthread_self();
+  char* p = out + sizeof(out) - 1;
+  *p = 0;
+  do {
+    --p;
+    *p = kHexLower[tid & 0xF];
+    tid >>= 4;
+  } while (p != out);
+}
+
+void FormatCurrentTime(char (&out)[64]) {
+  std::time_t time = std::time(nullptr);
+  struct tm tm;
+  if (localtime_r(&time, &tm) != &tm || std::strftime(out, sizeof(out), "%F %T", &tm) == 0) {
+    std::strcpy(out, "undef");
+  }
+}
+
+}  // namespace
+
+LogStreamBase::LogStreamBase(const char* file, int line, LogLevel lvl)
+    : errno_(errno), file_(file), line_(line), lvl_(LogLevelStr(lvl)) {
+  strm_ = std::make_unique<std::ostringstream>();
+}
+
+void LogStreamBase::Flush() {
+  {
+    std::string msg = strm_->str();
+    char tid[2 * sizeof(std::uintptr_t) + 1];
+    FormatThreadId(tid);
+    char time[64];
+    FormatCurrentTime(time);
+
+    std::unique_lock<std::mutex> lock(g_log_mutex);
+    std::fprintf(stderr, "[%s %s %s %s:%d] %s\n", time, tid, lvl_, file_, line_, msg.c_str());
+  }
+  strm_.reset();
+  errno = errno_;
+}
+
+std::ostream& operator<<(std::ostream& strm, Errno e) {
+  // GNU C Library uses a buffer of 1024 characters for strerror(). Mimic to avoid truncations.
+  char buf[1024];
+  auto x = strerror_r(e.err, buf, sizeof(buf));
+  // There are two versions of strerror_r with different semantics. We can figure out which
+  // one we've got by looking at the result type.
+  if (std::is_same<decltype(x), int>::value) {
+    // XSI-compliant version.
+    strm << (x ? "unknown error" : buf);
+  } else if (std::is_same<decltype(x), char*>::value) {
+    // GNU-specific version.
+    strm << x;
+  } else {
+    // Something else entirely.
+    strm << "unknown error";
+  }
+  return strm;
+}
+
+}  // namespace internal_logging
+
+LogLevel g_min_log_level = INFO;
+
+const char* LogLevelStr(LogLevel lvl) {
+  switch (lvl) {
+    case DEBUG:
+      return "DEBUG";
+    case INFO:
+      return "INFO";
+    case WARN:
+      return "WARN";
+    case ERROR:
+      return "ERROR";
+    case FATAL:
+      return "FATAL";
+  }
+  return "UNKNOWN";
+}
+
+bool ParseLogLevel(const char* s, LogLevel& lvl) {
+  if (!s)
+    return false;
+  else if (!std::strcmp(s, "DEBUG"))
+    lvl = DEBUG;
+  else if (!std::strcmp(s, "INFO"))
+    lvl = INFO;
+  else if (!std::strcmp(s, "WARN"))
+    lvl = WARN;
+  else if (!std::strcmp(s, "ERROR"))
+    lvl = ERROR;
+  else if (!std::strcmp(s, "FATAL"))
+    lvl = FATAL;
+  else
+    return false;
+  return true;
+}
+
+}  // namespace gitstatus

gitstatus/src/logging.h

@@ -0,0 +1,124 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_LOGGING_H_
+#define ROMKATV_GITSTATUS_LOGGING_H_
+
+#include <cstdlib>
+#include <memory>
+#include <ostream>
+#include <sstream>
+
+#define LOG(severity) LOG_I(severity)
+
+#define LOG_I(severity)                                                                            \
+  (::gitstatus::severity < ::gitstatus::g_min_log_level)                                           \
+      ? static_cast<void>(0)                                                                       \
+      : ::gitstatus::internal_logging::Assignable() =                                              \
+            ::gitstatus::internal_logging::LogStream<::gitstatus::severity>(__FILE__, __LINE__,    \
+                                                                            ::gitstatus::severity) \
+                .ref()
+
+namespace gitstatus {
+
+enum LogLevel {
+  DEBUG,
+  INFO,
+  WARN,
+  ERROR,
+  FATAL,
+};
+
+const char* LogLevelStr(LogLevel lvl);
+bool ParseLogLevel(const char* s, LogLevel& lvl);
+
+extern LogLevel g_min_log_level;
+
+namespace internal_logging {
+
+struct Assignable {
+  template <class T>
+  void operator=(const T&) const {}
+};
+
+class LogStreamBase {
+ public:
+  LogStreamBase(const char* file, int line, LogLevel lvl);
+
+  LogStreamBase& ref() { return *this; }
+  std::ostream& strm() { return *strm_; }
+  int stashed_errno() const { return errno_; }
+
+ protected:
+  void Flush();
+
+ private:
+  int errno_;
+  const char* file_;
+  int line_;
+  const char* lvl_;
+  std::unique_ptr<std::ostringstream> strm_;
+};
+
+template <LogLevel>
+class LogStream : public LogStreamBase {
+ public:
+  using LogStreamBase::LogStreamBase;
+  ~LogStream() { this->Flush(); }
+};
+
+template <>
+class LogStream<FATAL> : public LogStreamBase {
+ public:
+  using LogStreamBase::LogStreamBase;
+  ~LogStream() __attribute__((noreturn)) {
+    this->Flush();
+    std::abort();
+  }
+};
+
+template <class T>
+LogStreamBase& operator<<(LogStreamBase& strm, const T& val) {
+  strm.strm() << val;
+  return strm;
+}
+
+inline LogStreamBase& operator<<(LogStreamBase& strm, std::ostream& (*manip)(std::ostream&)) {
+  strm.strm() << manip;
+  return strm;
+}
+
+struct Errno {
+  int err;
+};
+
+std::ostream& operator<<(std::ostream& strm, Errno e);
+
+struct StashedErrno {};
+
+inline LogStreamBase& operator<<(LogStreamBase& strm, StashedErrno) {
+  return strm << Errno{strm.stashed_errno()};
+}
+
+}  // namespace internal_logging
+
+inline internal_logging::Errno Errno(int err) { return {err}; }
+inline internal_logging::StashedErrno Errno() { return {}; }
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_LOGGING_H_

gitstatus/src/options.cc

@@ -0,0 +1,362 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "options.h"
+
+#include <fnmatch.h>
+#include <getopt.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <climits>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+
+#include "print.h"
+
+namespace gitstatus {
+
+namespace {
+
+long ParseLong(const char* s) {
+  errno = 0;
+  char* end = nullptr;
+  long res = std::strtol(s, &end, 10);
+  if (*end || end == s || errno) {
+    std::cerr << "gitstatusd: not an integer: " << s << std::endl;
+    std::exit(10);
+  }
+  return res;
+}
+
+long ParseInt(const char* s) {
+  long res = ParseLong(s);
+  if (res < INT_MIN || res > INT_MAX) {
+    std::cerr << "gitstatusd: integer out of bounds: " << s << std::endl;
+    std::exit(10);
+  }
+  return res;
+}
+
+size_t ParseSizeT(const char* s) {
+  static_assert(sizeof(long) <= sizeof(size_t), "");
+  long res = ParseLong(s);
+  return res >= 0 ? res : -1;
+}
+
+void PrintUsage() {
+  std::cout << "Usage: gitstatusd [OPTION]...\n"
+            << "Print machine-readable status of the git repos for directories in stdin.\n"
+            << "\n"
+            << "OPTIONS\n"
+            << "  -l, --lock-fd=NUM [default=-1]\n"
+            << "   If non-negative, check whether the specified file descriptor is locked when\n"
+            << "   not receiving any requests for one second; exit if it isn't locked.\n"
+            << "\n"
+            << "  -p, --parent-pid=NUM [default=-1]\n"
+            << "   If non-negative, send signal 0 to the specified PID when not receiving any\n"
+            << "   requests for one second; exit if signal sending fails.\n"
+            << "\n"
+            << "  -t, --num-threads=NUM [default=1]\n"
+            << "   Use this many threads to scan git workdir for unstaged and untracked files.\n"
+            << "   Empirically, setting this parameter to twice the number of virtual CPU yields\n"
+            << "   maximum performance.\n"
+            << "\n"
+            << "  -v, --log-level=STR [default=INFO]\n"
+            << "   Don't write entries to log whose log level is below this. Log levels in\n"
+            << "   increasing order: DEBUG, INFO, WARN, ERROR, FATAL.\n"
+            << "\n"
+            << "  -r, --repo-ttl-seconds=NUM [default=3600]\n"
+            << "   Close git repositories that haven't been used for this long. This is meant to\n"
+            << "   release resources such as memory and file descriptors. The next request for a\n"
+            << "   repo that's been closed is much slower than for a repo that hasn't been.\n"
+            << "   Negative value means infinity.\n"
+            << "\n"
+            << "  -z, --max-commit-summary-length=NUM [default=256]\n"
+            << "   Truncate commit summary if it's longer than this many bytes.\n"
+            << "\n"
+            << "  -s, --max-num-staged=NUM [default=1]\n"
+            << "   Report at most this many staged changes; negative value means infinity.\n"
+            << "\n"
+            << "  -u, --max-num-unstaged=NUM [default=1]\n"
+            << "   Report at most this many unstaged changes; negative value means infinity.\n"
+            << "\n"
+            << "  -c, --max-num-conflicted=NUM [default=1]\n"
+            << "   Report at most this many conflicted changes; negative value means infinity.\n"
+            << "\n"
+            << "  -d, --max-num-untracked=NUM [default=1]\n"
+            << "   Report at most this many untracked files; negative value means infinity.\n"
+            << "\n"
+            << "  -m, --dirty-max-index-size=NUM [default=-1]\n"
+            << "   If a repo has more files in its index than this, override --max-num-unstaged\n"
+            << "   and --max-num-untracked (but not --max-num-staged) with zeros; negative value\n"
+            << "   means infinity.\n"
+            << "\n"
+            << "  -e, --recurse-untracked-dirs\n"
+            << "   Count files within untracked directories like `git status --untracked-files`.\n"
+            << "\n"
+            << "  -U, --ignore-status-show-untracked-files\n"
+            << "   Unless this option is specified, report zero untracked files for repositories\n"
+            << "   with status.showUntrackedFiles = false.\n"
+            << "\n"
+            << "  -W, --ignore-bash-show-untracked-files\n"
+            << "   Unless this option is specified, report zero untracked files for repositories\n"
+            << "   with bash.showUntrackedFiles = false.\n"
+            << "\n"
+            << "  -D, --ignore-bash-show-dirty-state\n"
+            << "   Unless this option is specified, report zero staged, unstaged and conflicted\n"
+            << "   changes for repositories with bash.showDirtyState = false.\n"
+            << "\n"
+            << "  -V, --version\n"
+            << "   Print gitstatusd version and exit.\n"
+            << "\n"
+            << "  -G, --version-glob=STR [default=*]\n"
+            << "   Immediately exit with code 11 if gitstatusd version (see --version) doesn't\n"
+            << "   does not match the specified pattern. Matching is done with fnmatch(3)\n"
+            << "   without flags.\n"
+            << "\n"
+            << "  -h, --help\n"
+            << "  Display this help and exit.\n"
+            << "\n"
+            << "INPUT\n"
+            << "\n"
+            << "  Requests are read from stdin, separated by ascii 30 (record separator). Each\n"
+            << "  request is made of the following fields, in the specified order, separated by\n"
+            << "  ascii 31 (unit separator):\n"
+            << "\n"
+            << "    1. Request ID. Any string. Can be empty.\n"
+            << "    2. Path to the directory for which git stats are being requested.\n"
+            << "       If the first character is ':', it is removed and the remaining path\n"
+            << "       is treated as GIT_DIR.\n"
+            << "    3. (Optional) '1' to disable computation of anything that requires reading\n"
+            << "       git index; '0' for the default behavior of computing everything.\n"
+            << "\n"
+            << "OUTPUT\n"
+            << "\n"
+            << "  For every request read from stdin there is response written to stdout.\n"
+            << "  Responses are separated by ascii 30 (record separator). Each response is made\n"
+            << "  of the following fields, in the specified order, separated by ascii 31\n"
+            << "  (unit separator):\n"
+            << "\n"
+            << "     1. Request id. The same as the first field in the request.\n"
+            << "     2. 0 if the directory isn't a git repo, 1 otherwise. If 0, all the\n"
+            << "        following fields are missing.\n"
+            << "     3. Absolute path to the git repository workdir.\n"
+            << "     4. Commit hash that HEAD is pointing to. 40 hex digits.\n"
+            << "     5. Local branch name or empty if not on a branch.\n"
+            << "     6. Upstream branch name. Can be empty.\n"
+            << "     7. The remote name, e.g. \"upstream\" or \"origin\".\n"
+            << "     8. Remote URL. Can be empty.\n"
+            << "     9. Repository state, A.K.A. action. Can be empty.\n"
+            << "    10. The number of files in the index.\n"
+            << "    11. The number of staged changes.\n"
+            << "    12. The number of unstaged changes.\n"
+            << "    13. The number of conflicted changes.\n"
+            << "    14. The number of untracked files.\n"
+            << "    15. Number of commits the current branch is ahead of upstream.\n"
+            << "    16. Number of commits the current branch is behind upstream.\n"
+            << "    17. The number of stashes.\n"
+            << "    18. The last tag (in lexicographical order) that points to the same\n"
+            << "        commit as HEAD.\n"
+            << "    19. The number of unstaged deleted files.\n"
+            << "    20. The number of staged new files.\n"
+            << "    21. The number of staged deleted files.\n"
+            << "    22. The push remote name, e.g. \"upstream\" or \"origin\".\n"
+            << "    23. Push remote URL. Can be empty.\n"
+            << "    24. Number of commits the current branch is ahead of push remote.\n"
+            << "    25. Number of commits the current branch is behind push remote.\n"
+            << "    26. Number of files in the index with skip-worktree bit set.\n"
+            << "    27. Number of files in the index with assume-unchanged bit set.\n"
+            << "    28. Encoding of the HEAD's commit message. Empty value means UTF-8.\n"
+            << "    29. The first paragraph of the HEAD's commit message as one line.\n"
+            << "\n"
+            << "Note: Renamed files are reported as deleted plus new.\n"
+            << "\n"
+            << "EXAMPLE\n"
+            << "\n"
+            << "  Send a single request and print response (zsh syntax):\n"
+            << "\n"
+            << "    local req_id=id\n"
+            << "    local dir=$PWD\n"
+            << "    echo -nE $req_id$'\\x1f'$dir$'\\x1e' | ./gitstatusd | {\n"
+            << "      local resp\n"
+            << "      IFS=$'\\x1f' read -rd $'\\x1e' -A resp && print -lr -- \"${(@qq)resp}\"\n"
+            << "    }\n"
+            << "\n"
+            << "  Output:"
+            << "\n"
+            << "    'id'\n"
+            << "    '1'\n"
+            << "    '/home/romka/gitstatus'\n"
+            << "    'bf46bf03dbab7108801b53f8a720caee8464c9c3'\n"
+            << "    'master'\n"
+            << "    'master'\n"
+            << "    'origin'\n"
+            << "    'git@github.com:romkatv/gitstatus.git'\n"
+            << "    ''\n"
+            << "    '70'\n"
+            << "    '1'\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    '2'\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    ''\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    ''\n"
+            << "    ''\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    '0'\n"
+            << "    ''\n"
+            << "    'add a build server for darwin-arm64'\n"
+            << "\n"
+            << "EXIT STATUS\n"
+            << "\n"
+            << "  The command returns zero on success (when printing help or on EOF),\n"
+            << "  non-zero on failure. In the latter case the output is unspecified.\n"
+            << "\n"
+            << "COPYRIGHT\n"
+            << "\n"
+            << "  Copyright 2019 Roman Perepelitsa\n"
+            << "  This is free software; see https://github.com/romkatv/gitstatus for copying\n"
+            << "  conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR\n"
+            << "  A PARTICULAR PURPOSE." << std::endl;
+}
+
+const char* Version() {
+#define _INTERNAL_GITSTATUS_STRINGIZE(x) _INTERNAL_GITSTATUS_STRINGIZE_I(x)
+#define _INTERNAL_GITSTATUS_STRINGIZE_I(x) #x
+  return _INTERNAL_GITSTATUS_STRINGIZE(GITSTATUS_VERSION);
+#undef _INTERNAL_GITSTATUS_STRINGIZE_I
+#undef _INTERNAL_GITSTATUS_STRINGIZE
+}
+
+}  // namespace
+
+Options ParseOptions(int argc, char** argv) {
+  const struct option opts[] = {{"help", no_argument, nullptr, 'h'},
+                                {"version", no_argument, nullptr, 'V'},
+                                {"version-glob", required_argument, nullptr, 'G'},
+                                {"lock-fd", required_argument, nullptr, 'l'},
+                                {"parent-pid", required_argument, nullptr, 'p'},
+                                {"num-threads", required_argument, nullptr, 't'},
+                                {"log-level", required_argument, nullptr, 'v'},
+                                {"repo-ttl-seconds", required_argument, nullptr, 'r'},
+                                {"max-commit-summary-length", required_argument, nullptr, 'z'},
+                                {"max-num-staged", required_argument, nullptr, 's'},
+                                {"max-num-unstaged", required_argument, nullptr, 'u'},
+                                {"max-num-conflicted", required_argument, nullptr, 'c'},
+                                {"max-num-untracked", required_argument, nullptr, 'd'},
+                                {"dirty-max-index-size", required_argument, nullptr, 'm'},
+                                {"recurse-untracked-dirs", no_argument, nullptr, 'e'},
+                                {"ignore-status-show-untracked-files", no_argument, nullptr, 'U'},
+                                {"ignore-bash-show-untracked-files", no_argument, nullptr, 'W'},
+                                {"ignore-bash-show-dirty-state", no_argument, nullptr, 'D'},
+                                {}};
+  Options res;
+  while (true) {
+    switch (getopt_long(argc, argv, "hVG:l:p:t:v:r:z:s:u:c:d:m:eUWD", opts, nullptr)) {
+      case -1:
+        if (optind != argc) {
+          std::cerr << "unexpected positional argument: " << argv[optind] << std::endl;
+          std::exit(10);
+        }
+        return res;
+      case 'h':
+        PrintUsage();
+        std::exit(0);
+      case 'V':
+        std::cout << Version() << std::endl;
+        std::exit(0);
+      case 'G':
+        if (int err = fnmatch(optarg, Version(), 0)) {
+          if (err != FNM_NOMATCH) {
+            std::cerr << "Cannot match " << Print(Version()) << " against pattern "
+                                         << Print(optarg) << ": error " << err;
+            std::exit(10);
+          }
+          std::cerr << "Version mismatch. Wanted (pattern): " << Print(optarg)
+                    << ". Actual: " << Print(Version()) << "." << std::endl;
+          std::exit(11);
+        }
+        break;
+      case 'l':
+        res.lock_fd = ParseInt(optarg);
+        break;
+      case 'p':
+        res.parent_pid = ParseInt(optarg);
+        break;
+      case 'v':
+        if (!ParseLogLevel(optarg, res.log_level)) {
+          std::cerr << "invalid log level: " << optarg << std::endl;
+          std::exit(10);
+        }
+        break;
+      case 'r':
+        res.repo_ttl = std::chrono::seconds(ParseLong(optarg));
+        break;
+      case 't': {
+        long n = ParseLong(optarg);
+        if (n <= 0) {
+          std::cerr << "invalid number of threads: " << n << std::endl;
+          std::exit(10);
+        }
+        res.num_threads = n;
+        break;
+      }
+      case 'z':
+        res.max_commit_summary_length = ParseSizeT(optarg);
+        break;
+      case 's':
+        res.max_num_staged = ParseSizeT(optarg);
+        break;
+      case 'u':
+        res.max_num_unstaged = ParseSizeT(optarg);
+        break;
+      case 'c':
+        res.max_num_conflicted = ParseSizeT(optarg);
+        break;
+      case 'd':
+        res.max_num_untracked = ParseSizeT(optarg);
+        break;
+      case 'm':
+        res.dirty_max_index_size = ParseSizeT(optarg);
+        break;
+      case 'e':
+        res.recurse_untracked_dirs = true;
+        break;
+      case 'U':
+        res.ignore_status_show_untracked_files = true;
+        break;
+      case 'W':
+        res.ignore_bash_show_untracked_files = true;
+        break;
+      case 'D':
+        res.ignore_bash_show_dirty_state = true;
+        break;
+      default:
+        std::exit(10);
+    }
+  }
+}
+
+}  // namespace gitstatus

gitstatus/src/options.h

@@ -0,0 +1,78 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_OPTIONS_H_
+#define ROMKATV_GITSTATUS_OPTIONS_H_
+
+#include <chrono>
+#include <string>
+
+#include "logging.h"
+#include "time.h"
+
+namespace gitstatus {
+
+struct Limits {
+  // Truncate commit summary if it's longer than this many bytes.
+  size_t max_commit_summary_length = 256;
+  // Report at most this many staged changes.
+  size_t max_num_staged = 1;
+  // Report at most this many unstaged changes.
+  size_t max_num_unstaged = 1;
+  // Report at most this many conflicted changes.
+  size_t max_num_conflicted = 1;
+  // Report at most this many untracked files.
+  size_t max_num_untracked = 1;
+  // If a repo has more files in its index than this, override max_num_unstaged and
+  // max_num_untracked (but not max_num_staged) with zeros.
+  size_t dirty_max_index_size = -1;
+  // If true, report untracked files like `git status --untracked-files`.
+  bool recurse_untracked_dirs = false;
+  // Unless true, report zero untracked files for repositories with
+  // status.showUntrackedFiles = false.
+  bool ignore_status_show_untracked_files = false;
+  // Unless true, report zero untracked files for repositories with
+  // bash.showUntrackedFiles = false.
+  bool ignore_bash_show_untracked_files = false;
+  // Unless true, report zero staged, unstaged and conflicted changes for repositories with
+  // bash.showDirtyState = false.
+  bool ignore_bash_show_dirty_state = false;
+};
+
+struct Options : Limits {
+  // Use this many threads to scan git workdir for unstaged and untracked files. Must be positive.
+  size_t num_threads = 1;
+  // If non-negative, check whether the specified file descriptor is locked when not receiving any
+  // requests for one second; exit if it isn't locked.
+  int lock_fd = -1;
+  // If non-negative, send signal 0 to the specified PID when not receiving any requests for one
+  // second; exit if signal sending fails.
+  int parent_pid = -1;
+  // Don't write entries to log whose log level is below this. Log levels in increasing order:
+  // DEBUG, INFO, WARN, ERROR, FATAL.
+  LogLevel log_level = INFO;
+  // Close git repositories that haven't been used for this long. This is meant to release resources
+  // such as memory and file descriptors. The next request for a repo that's been closed is much
+  // slower than for a repo that hasn't been. Negative value means infinity.
+  Duration repo_ttl = std::chrono::seconds(3600);
+};
+
+Options ParseOptions(int argc, char** argv);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_OPTIONS_H_

gitstatus/src/print.h

@@ -0,0 +1,101 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_PRINT_H_
+#define ROMKATV_GITSTATUS_PRINT_H_
+
+#include <sys/stat.h>
+
+#include <iomanip>
+#include <ostream>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include <git2.h>
+
+#include "string_view.h"
+#include "strings.h"
+
+namespace gitstatus {
+
+template <class T>
+struct Printable {
+  const T& value;
+};
+
+template <class T>
+Printable<T> Print(const T& val) {
+  return {val};
+}
+
+template <class T>
+std::ostream& operator<<(std::ostream& strm, const Printable<T>& p) {
+  static_assert(!std::is_pointer<std::decay_t<T>>(), "");
+  return strm << p.value;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<StringView>& p) {
+  Quote(strm, p.value.ptr, p.value.ptr + p.value.len);
+  return strm;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<std::string>& p) {
+  Quote(strm, p.value.data(), p.value.data() + p.value.size());
+  return strm;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<const char*>& p) {
+  Quote(strm, p.value, p.value ? p.value + std::strlen(p.value) : nullptr);
+  return strm;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<char*>& p) {
+  Quote(strm, p.value, p.value ? p.value + std::strlen(p.value) : nullptr);
+  return strm;
+}
+
+template <class T, class U>
+std::ostream& operator<<(std::ostream& strm, const Printable<std::pair<T, U>>& p) {
+  return strm << '{' << Print(p.value.first) << ", " << Print(p.value.second) << '}';
+}
+
+template <class T>
+std::ostream& operator<<(std::ostream& strm, const Printable<std::vector<T>>& p) {
+  strm << '[';
+  for (size_t i = 0; i != p.value.size(); ++i) {
+    if (i) strm << ", ";
+    strm << Print(p.value[i]);
+  }
+  strm << ']';
+  return strm;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<struct timespec>& p) {
+  strm << p.value.tv_sec << '.' << std::setw(9) << std::setfill('0') << p.value.tv_nsec;
+  return strm;
+}
+
+inline std::ostream& operator<<(std::ostream& strm, const Printable<git_index_time>& p) {
+  strm << p.value.seconds << '.' << std::setw(9) << std::setfill('0') << p.value.nanoseconds;
+  return strm;
+}
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_PRINT_H_

gitstatus/src/repo.cc

@@ -0,0 +1,503 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "repo.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <atomic>
+#include <cstdlib>
+#include <cstring>
+#include <exception>
+#include <iterator>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+#include "arena.h"
+#include "check.h"
+#include "check_dir_mtime.h"
+#include "dir.h"
+#include "git.h"
+#include "print.h"
+#include "scope_guard.h"
+#include "stat.h"
+#include "string_cmp.h"
+#include "thread_pool.h"
+#include "timer.h"
+
+namespace gitstatus {
+
+namespace {
+
+using namespace std::string_literals;
+
+template <class T>
+T Load(const std::atomic<T>& x) {
+  return x.load(std::memory_order_relaxed);
+}
+
+template <class T>
+void Store(std::atomic<T>& x, T v) {
+  x.store(v, std::memory_order_relaxed);
+}
+
+template <class T>
+T Inc(std::atomic<T>& x, T by = 1) {
+  return x.fetch_add(by, std::memory_order_relaxed);
+}
+
+template <class T>
+T Dec(std::atomic<T>& x) {
+  return x.fetch_sub(1, std::memory_order_relaxed);
+}
+
+template <class T>
+T Exchange(std::atomic<T>& x, T v) {
+  return x.exchange(v, std::memory_order_relaxed);
+}
+
+const char* DeltaStr(git_delta_t t) {
+  switch (t) {
+    case GIT_DELTA_UNMODIFIED: return "unmodified";
+    case GIT_DELTA_ADDED: return "added";
+    case GIT_DELTA_DELETED: return "deleted";
+    case GIT_DELTA_MODIFIED: return "modified";
+    case GIT_DELTA_RENAMED: return "renamed";
+    case GIT_DELTA_COPIED: return "copied";
+    case GIT_DELTA_IGNORED: return "ignored";
+    case GIT_DELTA_UNTRACKED: return "untracked";
+    case GIT_DELTA_TYPECHANGE: return "typechange";
+    case GIT_DELTA_UNREADABLE: return "unreadable";
+    case GIT_DELTA_CONFLICTED: return "conflicted";
+  }
+  return "unknown";
+}
+
+}  // namespace
+
+bool Repo::Shard::Contains(Str<> str, StringView path) const {
+  if (str.Lt(path, start_s)) return false;
+  if (end_s.empty()) return true;
+  path.len = std::min(path.len, end_s.size());
+  return !str.Lt(end_s, path);
+}
+
+Repo::Repo(git_repository* repo, Limits lim) : lim_(std::move(lim)), repo_(repo), tag_db_(repo) {
+  if (lim_.max_num_untracked) {
+    GlobalThreadPool()->Schedule([this] {
+      bool check = CheckDirMtime(git_repository_path(repo_));
+      std::unique_lock<std::mutex> lock(mutex_);
+      CHECK(Load(untracked_cache_) == Tribool::kUnknown);
+      Store(untracked_cache_, check ? Tribool::kTrue : Tribool::kFalse);
+      cv_.notify_one();
+    });
+  } else {
+    untracked_cache_ = Tribool::kFalse;
+  }
+}
+
+Repo::~Repo() {
+  {
+    std::unique_lock<std::mutex> lock(mutex_);
+    while (untracked_cache_ == Tribool::kUnknown) cv_.wait(lock);
+  }
+  if (git_index_) git_index_free(git_index_);
+  git_repository_free(repo_);
+}
+
+IndexStats Repo::GetIndexStats(const git_oid* head, git_config* cfg) {
+  ON_SCOPE_EXIT(this, orig_lim = lim_) { lim_ = orig_lim; };
+  auto Off = [&](const char* name) {
+    int val;
+    if (git_config_get_bool(&val, cfg, name) || val) return false;
+    LOG(INFO) << "Honoring git config option: " << name << " = false";
+    return true;
+  };
+  if (!lim_.ignore_status_show_untracked_files && Off("status.showUntrackedFiles")) {
+    lim_.max_num_untracked = 0;
+  }
+  if (!lim_.ignore_bash_show_untracked_files && Off("bash.showUntrackedFiles")) {
+    lim_.max_num_untracked = 0;
+  }
+  if (!lim_.ignore_bash_show_dirty_state && Off("bash.showDirtyState")) {
+    lim_.max_num_staged = 0;
+    lim_.max_num_unstaged = 0;
+    lim_.max_num_conflicted = 0;
+  }
+
+  if (git_index_) {
+    int new_index;
+    VERIFY(!git_index_read_ex(git_index_, 0, &new_index)) << GitError();
+    if (new_index) {
+      head_ = {};
+      index_.reset();
+    }
+  } else {
+    VERIFY(!git_repository_index(&git_index_, repo_)) << GitError();
+    // Query an attribute (doesn't matter which) to initialize repo's attribute
+    // cache. It's a workaround for synchronization bugs (data races) in libgit2
+    // that result from lazy cache initialization without synchronization.
+    // Thankfully, subsequent cache reads and writes are properly synchronized.
+    const char* attr;
+    VERIFY(!git_attr_get(&attr, repo_, 0, "x", "x")) << GitError();
+  }
+
+  UpdateShards();
+  Store(error_, false);
+  Store(unstaged_, {});
+  Store(untracked_, {});
+  Store(unstaged_deleted_, {});
+
+  std::vector<const char*> dirty_candidates;
+  const size_t index_size = git_index_entrycount(git_index_);
+
+  if (!lim_.max_num_staged && !lim_.max_num_conflicted) {
+    head_ = {};
+    Store(staged_, {});
+    Store(conflicted_, {});
+    Store(staged_new_, {});
+    Store(staged_deleted_, {});
+    Store(skip_worktree_, {});
+    Store(assume_unchanged_, {});
+  } else if (head) {
+    if (git_oid_equal(head, &head_)) {
+      LOG(INFO) << "Index and HEAD unchanged; staged = " << Load(staged_)
+                << ", conflicted = " << Load(conflicted_);
+    } else {
+      head_ = *head;
+      Store(staged_, {});
+      Store(conflicted_, {});
+      Store(staged_new_, {});
+      Store(staged_deleted_, {});
+      Store(skip_worktree_, {});
+      Store(assume_unchanged_, {});
+      StartStagedScan(head);
+    }
+  } else {
+    head_ = {};
+    size_t staged = 0;
+    size_t skip_worktree = 0;
+    size_t assume_unchanged = 0;
+    for (size_t i = 0; i != index_size; ++i) {
+      const git_index_entry* entry = git_index_get_byindex_no_sort(git_index_, i);
+      if (!(entry->flags_extended & GIT_INDEX_ENTRY_INTENT_TO_ADD)) ++staged;
+      if (entry->flags_extended & GIT_INDEX_ENTRY_SKIP_WORKTREE) ++skip_worktree;
+      if (entry->flags & GIT_INDEX_ENTRY_VALID) ++assume_unchanged;
+    }
+    Store(staged_, staged);
+    Store(conflicted_, {});
+    Store(staged_new_, staged);
+    Store(staged_deleted_, {});
+    Store(skip_worktree_, skip_worktree);
+    Store(assume_unchanged_, assume_unchanged);
+  }
+
+  if (index_size <= lim_.dirty_max_index_size &&
+      (lim_.max_num_unstaged || lim_.max_num_untracked)) {
+    if (!index_) index_ = std::make_unique<Index>(repo_, git_index_);
+    dirty_candidates = index_->GetDirtyCandidates({.include_untracked = lim_.max_num_untracked > 0,
+                                                   .untracked_cache = Load(untracked_cache_)});
+    if (dirty_candidates.empty()) {
+      LOG(INFO) << "Clean repo: no dirty candidates";
+    } else {
+      LOG(INFO) << "Found " << dirty_candidates.size() << " dirty candidate(s) spanning from "
+                << Print(dirty_candidates.front()) << " to " << Print(dirty_candidates.back());
+    }
+    StartDirtyScan(dirty_candidates);
+  }
+
+  Wait();
+  VERIFY(!Load(error_));
+
+  size_t num_staged = std::min(Load(staged_), lim_.max_num_staged);
+  size_t num_unstaged = std::min(Load(unstaged_), lim_.max_num_unstaged);
+  return {.index_size = index_size,
+          .num_staged = num_staged,
+          .num_unstaged = num_unstaged,
+          .num_conflicted = std::min(Load(conflicted_), lim_.max_num_conflicted),
+          .num_untracked = std::min(Load(untracked_), lim_.max_num_untracked),
+          .num_staged_new = std::min(Load(staged_new_), num_staged),
+          .num_staged_deleted = std::min(Load(staged_deleted_), num_staged),
+          .num_unstaged_deleted = std::min(Load(unstaged_deleted_), num_unstaged),
+          .num_skip_worktree = Load(skip_worktree_),
+          .num_assume_unchanged = Load(assume_unchanged_)};
+}
+
+int Repo::OnDelta(const char* type, const git_diff_delta& d, std::atomic<size_t>& c1, size_t m1,
+                  const std::atomic<size_t>& c2, size_t m2) {
+  auto Msg = [&]() {
+    const char* status = DeltaStr(d.status);
+    std::ostringstream strm;
+    strm << "Found " << type << " file";
+    if (strcmp(status, type)) strm << " (" << status << ")";
+    strm << ": " << Print(d.new_file.path);
+    return strm.str();
+  };
+
+  size_t v = Inc(c1);
+  if (v) {
+    LOG(DEBUG) << Msg();
+  } else {
+    LOG(INFO) << Msg();
+  }
+  if (v + 1 < m1) return GIT_DIFF_DELTA_DO_NOT_INSERT;
+  if (Load(c2) < m2) return GIT_DIFF_DELTA_DO_NOT_INSERT | GIT_DIFF_DELTA_SKIP_TYPE;
+  return GIT_EUSER;
+}
+
+void Repo::StartDirtyScan(const std::vector<const char*>& paths) {
+  if (paths.empty()) return;
+
+  git_diff_options opt = GIT_DIFF_OPTIONS_INIT;
+  opt.payload = this;
+  opt.flags = GIT_DIFF_INCLUDE_TYPECHANGE_TREES | GIT_DIFF_SKIP_BINARY_CHECK |
+              GIT_DIFF_DISABLE_PATHSPEC_MATCH | GIT_DIFF_EXEMPLARS;
+  if (lim_.max_num_untracked) {
+    opt.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
+    if (lim_.recurse_untracked_dirs) opt.flags |= GIT_DIFF_RECURSE_UNTRACKED_DIRS;
+  } else {
+    opt.flags |= GIT_DIFF_ENABLE_FAST_UNTRACKED_DIRS;
+  }
+  opt.ignore_submodules = GIT_SUBMODULE_IGNORE_DIRTY;
+  opt.notify_cb = +[](const git_diff* diff, const git_diff_delta* delta,
+                      const char* matched_pathspec, void* payload) -> int {
+    if (delta->status == GIT_DELTA_CONFLICTED) return GIT_DIFF_DELTA_DO_NOT_INSERT;
+    Repo* repo = static_cast<Repo*>(payload);
+    if (Load(repo->error_)) return GIT_EUSER;
+    if (delta->status == GIT_DELTA_UNTRACKED) {
+      return repo->OnDelta("untracked", *delta, repo->untracked_, repo->lim_.max_num_untracked,
+                           repo->unstaged_, repo->lim_.max_num_unstaged);
+    } else {
+      if (delta->status == GIT_DELTA_DELETED) Inc(repo->unstaged_deleted_);
+      return repo->OnDelta("unstaged", *delta, repo->unstaged_, repo->lim_.max_num_unstaged,
+                           repo->untracked_, repo->lim_.max_num_untracked);
+    }
+  };
+
+  const Str<> str(git_index_is_case_sensitive(git_index_));
+  auto shard = shards_.begin();
+  for (auto p = paths.begin(); p != paths.end();) {
+    opt.range_start = *p;
+    opt.range_end = *p;
+    opt.pathspec.strings = const_cast<char**>(&*p);
+    opt.pathspec.count = 1;
+    while (!shard->Contains(str, StringView(*p))) ++shard;
+    while (++p != paths.end() && shard->Contains(str, StringView(*p))) {
+      opt.range_end = *p;
+      ++opt.pathspec.count;
+    }
+    RunAsync([this, opt]() {
+      git_diff* diff = nullptr;
+      LOG(DEBUG) << "git_diff_index_to_workdir from " << Print(opt.range_start) << " to "
+                 << Print(opt.range_end);
+      switch (git_diff_index_to_workdir(&diff, repo_, git_index_, &opt)) {
+        case 0:
+          git_diff_free(diff);
+          break;
+        case GIT_EUSER:
+          break;
+        default:
+          LOG(ERROR) << "git_diff_index_to_workdir: " << GitError();
+          throw Exception();
+      }
+    });
+  }
+}
+
+void Repo::StartStagedScan(const git_oid* head) {
+  git_commit* commit = nullptr;
+  VERIFY(!git_commit_lookup(&commit, repo_, head)) << GitError();
+  ON_SCOPE_EXIT(=) { git_commit_free(commit); };
+  git_tree* tree = nullptr;
+  VERIFY(!git_commit_tree(&tree, commit)) << GitError();
+
+  git_diff_options opt = GIT_DIFF_OPTIONS_INIT;
+  opt.flags = GIT_DIFF_EXEMPLARS | GIT_DIFF_INCLUDE_TYPECHANGE_TREES;
+  opt.payload = this;
+  opt.notify_cb = +[](const git_diff* diff, const git_diff_delta* delta,
+                      const char* matched_pathspec, void* payload) -> int {
+    Repo* repo = static_cast<Repo*>(payload);
+    if (Load(repo->error_)) return GIT_EUSER;
+    if (delta->status == GIT_DELTA_CONFLICTED) {
+      return repo->OnDelta("conflicted", *delta, repo->conflicted_, repo->lim_.max_num_conflicted,
+                           repo->staged_, repo->lim_.max_num_staged);
+    } else {
+      if (delta->status == GIT_DELTA_ADDED) Inc(repo->staged_new_);
+      if (delta->status == GIT_DELTA_DELETED) Inc(repo->staged_deleted_);
+      return repo->OnDelta("staged", *delta, repo->staged_, repo->lim_.max_num_staged,
+                           repo->conflicted_, repo->lim_.max_num_conflicted);
+    }
+  };
+
+  for (const Shard& shard : shards_) {
+    RunAsync([this, tree, opt, shard]() mutable {
+      size_t skip_worktree = 0;
+      size_t assume_unchanged = 0;
+      for (size_t i = shard.start_i; i != shard.end_i; ++i) {
+        const git_index_entry* entry = git_index_get_byindex_no_sort(git_index_, i);
+        if (entry->flags_extended & GIT_INDEX_ENTRY_SKIP_WORKTREE) ++skip_worktree;
+        if (entry->flags & GIT_INDEX_ENTRY_VALID) ++assume_unchanged;
+      }
+      Inc(skip_worktree_, skip_worktree);
+      Inc(assume_unchanged_, assume_unchanged);
+      opt.range_start = shard.start_s.c_str();
+      opt.range_end = shard.end_s.c_str();
+      git_diff* diff = nullptr;
+      LOG(DEBUG) << "git_diff_tree_to_index from " << Print(opt.range_start) << " to "
+                 << Print(opt.range_end);
+      switch (git_diff_tree_to_index(&diff, repo_, tree, git_index_, &opt)) {
+        case 0:
+          git_diff_free(diff);
+          break;
+        case GIT_EUSER:
+          break;
+        default:
+          LOG(ERROR) << "git_diff_tree_to_index: " << GitError();
+          throw Exception();
+      }
+    });
+  }
+}
+
+void Repo::UpdateShards() {
+  constexpr size_t kEntriesPerShard = 512;
+
+  const Str<> str(git_index_is_case_sensitive(git_index_));
+  size_t index_size = git_index_entrycount(git_index_);
+  ON_SCOPE_EXIT(&) {
+    LOG(INFO) << "Splitting " << index_size << " object(s) into " << shards_.size() << " shard(s)";
+  };
+
+  if (index_size <= kEntriesPerShard || GlobalThreadPool()->num_threads() < 2) {
+    shards_ = {{
+      .start_s = "",
+      .end_s = "",
+      .start_i = 0,
+      .end_i = index_size}};
+    return;
+  }
+
+  size_t shards =
+      std::min(index_size / kEntriesPerShard + 1, 2 * GlobalThreadPool()->num_threads());
+  shards_.clear();
+  shards_.reserve(shards);
+  std::string last_s;
+  size_t last_i = 0;
+
+  for (size_t i = 0; i != shards - 1; ++i) {
+    size_t idx = (i + 1) * index_size / shards;
+    std::string split = git_index_get_byindex_no_sort(git_index_, idx)->path;
+    auto pos = split.find_last_of('/');
+    if (pos == std::string::npos) continue;
+    split = split.substr(0, pos + 1);
+    Shard shard;
+    shard.end_s = split;
+    --shard.end_s.back();
+    if (!str.Lt(last_s, shard.end_s)) continue;
+    shard.start_s = std::move(last_s);
+    last_s = std::move(split);
+    shard.start_i = last_i;
+    shard.end_i = idx;
+    last_i = idx;
+    shards_.push_back(std::move(shard));
+  }
+  shards_.push_back({
+    .start_s = std::move(last_s),
+    .end_s = "",
+    .start_i = last_i,
+    .end_i = index_size});
+
+  CHECK(!shards_.empty());
+  CHECK(shards_.size() <= shards);
+  CHECK(shards_.front().start_s.empty());
+  CHECK(shards_.front().start_i == 0);
+  CHECK(shards_.back().end_s.empty());
+  CHECK(shards_.back().end_i == index_size);
+  for (size_t i = 0; i != shards_.size(); ++i) {
+    if (i) {
+      const git_index_entry* entry = git_index_get_byindex_no_sort(git_index_, shards_[i].start_i);
+      CHECK(!std::memcmp(shards_[i].start_s.c_str(), entry->path, shards_[i].start_s.size()));
+      CHECK(str.Lt(shards_[i - 1].end_s, shards_[i].start_s));
+      CHECK(shards_[i - 1].end_i == shards_[i].start_i);
+    }
+    if (i != shards_.size() - 1) {
+      CHECK(shards_[i].start_i < shards_[i].end_i);
+      CHECK(str.Lt(shards_[i].start_s, shards_[i].end_s));
+    }
+  }
+}
+
+void Repo::DecInflight() {
+  std::unique_lock<std::mutex> lock(mutex_);
+  CHECK(Load(inflight_) > 0);
+  if (Dec(inflight_) == 1) cv_.notify_one();
+}
+
+void Repo::RunAsync(std::function<void()> f) {
+  Inc(inflight_);
+  try {
+    GlobalThreadPool()->Schedule([this, f = std::move(f)] {
+      try {
+        ON_SCOPE_EXIT(&) { DecInflight(); };
+        f();
+      } catch (const Exception&) {
+        if (!Load(error_)) {
+          std::unique_lock<std::mutex> lock(mutex_);
+          if (!Load(error_)) {
+            Store(error_, true);
+            cv_.notify_one();
+          }
+        }
+      }
+    });
+  } catch (...) {
+    DecInflight();
+    throw;
+  }
+}
+
+void Repo::Wait() {
+  std::unique_lock<std::mutex> lock(mutex_);
+  while (inflight_) cv_.wait(lock);
+}
+
+std::future<std::string> Repo::GetTagName(const git_oid* target) {
+  auto* promise = new std::promise<std::string>;
+  std::future<std::string> res = promise->get_future();
+
+  GlobalThreadPool()->Schedule([=] {
+    ON_SCOPE_EXIT(&) { delete promise; };
+    if (!target) {
+      promise->set_value("");
+      return;
+    }
+    try {
+      promise->set_value(tag_db_.TagForCommit(*target));
+    } catch (const Exception&) {
+      promise->set_exception(std::current_exception());
+    }
+  });
+
+  return res;
+}
+
+}  // namespace gitstatus

gitstatus/src/repo.h

@@ -0,0 +1,126 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_REPO_H_
+#define ROMKATV_GITSTATUS_REPO_H_
+
+#include <stddef.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <git2.h>
+
+#include <algorithm>
+#include <atomic>
+#include <condition_variable>
+#include <cstddef>
+#include <cstring>
+#include <functional>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "check.h"
+#include "index.h"
+#include "options.h"
+#include "string_cmp.h"
+#include "tag_db.h"
+#include "time.h"
+
+namespace gitstatus {
+
+struct IndexStats {
+  size_t index_size = 0;
+  size_t num_staged = 0;
+  size_t num_unstaged = 0;
+  size_t num_conflicted = 0;
+  size_t num_untracked = 0;
+  size_t num_staged_new = 0;
+  size_t num_staged_deleted = 0;
+  size_t num_unstaged_deleted = 0;
+  size_t num_skip_worktree = 0;
+  size_t num_assume_unchanged = 0;
+};
+
+class Repo {
+ public:
+  explicit Repo(git_repository* repo, Limits lim);
+  Repo(Repo&& other) = delete;
+  ~Repo();
+
+  git_repository* repo() const { return repo_; }
+
+  // Head can be null, in which case has_staged will be false.
+  IndexStats GetIndexStats(const git_oid* head, git_config* cfg);
+
+  // Returns the last tag in lexicographical order whose target is equal to the given, or an
+  // empty string. Target can be null, in which case the tag is empty.
+  std::future<std::string> GetTagName(const git_oid* target);
+
+ private:
+  struct Shard {
+    bool Contains(Str<> str, StringView path) const;
+    std::string start_s;
+    std::string end_s;
+    size_t start_i;
+    size_t end_i;
+  };
+
+  void UpdateShards();
+
+  int OnDelta(const char* type, const git_diff_delta& d, std::atomic<size_t>& c1, size_t m1,
+              const std::atomic<size_t>& c2, size_t m2);
+
+  void StartStagedScan(const git_oid* head);
+  void StartDirtyScan(const std::vector<const char*>& paths);
+
+  void DecInflight();
+  void RunAsync(std::function<void()> f);
+  void Wait();
+
+  Limits lim_;
+  git_repository* const repo_;
+  git_index* git_index_ = nullptr;
+  std::vector<Shard> shards_;
+  git_oid head_ = {};
+  TagDb tag_db_;
+
+  std::unique_ptr<Index> index_;
+
+  std::mutex mutex_;
+  std::condition_variable cv_;
+  std::atomic<size_t> inflight_{0};
+  std::atomic<bool> error_{false};
+  std::atomic<size_t> staged_{0};
+  std::atomic<size_t> unstaged_{0};
+  std::atomic<size_t> conflicted_{0};
+  std::atomic<size_t> untracked_{0};
+  std::atomic<size_t> staged_new_{0};
+  std::atomic<size_t> staged_deleted_{0};
+  std::atomic<size_t> unstaged_deleted_{0};
+  std::atomic<size_t> skip_worktree_{0};
+  std::atomic<size_t> assume_unchanged_{0};
+  std::atomic<Tribool> untracked_cache_{Tribool::kUnknown};
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_REPO_H_

gitstatus/src/repo_cache.cc

@@ -0,0 +1,167 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "repo_cache.h"
+
+#include <cstring>
+
+#include "check.h"
+#include "git.h"
+#include "print.h"
+#include "scope_guard.h"
+#include "string_view.h"
+
+namespace gitstatus {
+
+namespace {
+
+void GitDirs(const char* dir, bool from_dotgit, std::string& gitdir, std::string& workdir) {
+  git_buf gitdir_buf = {};
+  git_buf workdir_buf = {};
+  ON_SCOPE_EXIT(&) {
+    git_buf_free(&gitdir_buf);
+    git_buf_free(&workdir_buf);
+  };
+  int flags = from_dotgit ? GIT_REPOSITORY_OPEN_NO_SEARCH | GIT_REPOSITORY_OPEN_NO_DOTGIT : 0;
+  switch (git_repository_discover_ex(&gitdir_buf, &workdir_buf, NULL, NULL, dir, flags, nullptr)) {
+    case 0:
+      gitdir.assign(gitdir_buf.ptr, gitdir_buf.size);
+      workdir.assign(workdir_buf.ptr, workdir_buf.size);
+      VERIFY(!gitdir.empty() && gitdir.front() == '/' && gitdir.back() == '/');
+      VERIFY(!workdir.empty() && workdir.front() == '/' && workdir.back() == '/');
+      break;
+    case GIT_ENOTFOUND:
+      gitdir.clear();
+      workdir.clear();
+      break;
+    default:
+      LOG(ERROR) << "git_repository_open_ext: " << Print(dir) << ": " << GitError();
+      throw Exception();
+  }
+}
+
+git_repository* OpenRepo(const std::string& dir, bool from_dotgit) {
+  git_repository* repo = nullptr;
+  int flags = from_dotgit ? GIT_REPOSITORY_OPEN_NO_SEARCH | GIT_REPOSITORY_OPEN_NO_DOTGIT : 0;
+  switch (git_repository_open_ext(&repo, dir.c_str(), flags, nullptr)) {
+    case 0:
+      return repo;
+    case GIT_ENOTFOUND:
+      return nullptr;
+    default:
+      LOG(ERROR) << "git_repository_open_ext: " << Print(dir) << ": " << GitError();
+      throw Exception();
+  }
+}
+
+std::string DirName(std::string path) {
+  if (path.empty()) return "";
+  while (path.back() == '/') {
+    path.pop_back();
+    if (path.empty()) return "";
+  }
+  do {
+    path.pop_back();
+    if (path.empty()) return "";
+  } while (path.back() != '/');
+  return path;
+}
+
+}  // namespace
+
+Repo* RepoCache::Open(const std::string& dir, bool from_dotgit) {
+  if (dir.empty() || dir.front() != '/') return nullptr;
+
+  std::string gitdir, workdir;
+  GitDirs(dir.c_str(), from_dotgit, gitdir, workdir);
+  if (gitdir.empty()) {
+    // This isn't quite correct because of differences in canonicalization, .git files and GIT_DIR.
+    // A proper solution would require tracking the "discovery dir" for every repository and
+    // performing path canonicalization.
+    if (from_dotgit) {
+      Erase(cache_.find(dir.back() == '/' ? dir : dir + '/'));
+    } else {
+      std::string path = dir;
+      if (path.back() != '/') path += '/';
+      do {
+        Erase(cache_.find(path + ".git/"));
+        path = DirName(path);
+      } while (!path.empty());
+    }
+    return nullptr;
+  }
+
+  auto it = cache_.find(gitdir);
+  if (it != cache_.end()) {
+    lru_.erase(it->second->lru);
+    it->second->lru = lru_.insert({Clock::now(), it});
+    return it->second.get();
+  }
+
+  // Opening from gitdir is faster but we cannot use it when gitdir came from a .git file.
+  git_repository* repo =
+      DirName(gitdir) == workdir ? OpenRepo(gitdir, true) : OpenRepo(dir, from_dotgit);
+  if (!repo) return nullptr;
+  ON_SCOPE_EXIT(&) {
+    if (repo) git_repository_free(repo);
+  };
+  if (git_repository_is_bare(repo)) return nullptr;
+  workdir = git_repository_workdir(repo) ?: "";
+  if (workdir.empty()) return nullptr;
+  VERIFY(workdir.front() == '/' && workdir.back() == '/') << Print(workdir);
+
+  auto x = cache_.emplace(gitdir, nullptr);
+  std::unique_ptr<Entry>& elem = x.first->second;
+  if (elem) {
+    lru_.erase(elem->lru);
+  } else {
+    LOG(INFO) << "Initializing new repository: " << Print(gitdir);
+
+    // Libgit2 initializes odb and refdb lazily with double-locking. To avoid useless work
+    // when multiple threads attempt to initialize the same db at the same time, we trigger
+    // initialization manually before threads are in play.
+    git_odb* odb;
+    VERIFY(!git_repository_odb(&odb, repo)) << GitError();
+    git_odb_free(odb);
+
+    git_refdb* refdb;
+    VERIFY(!git_repository_refdb(&refdb, repo)) << GitError();
+    git_refdb_free(refdb);
+
+    elem = std::make_unique<Entry>(std::exchange(repo, nullptr), lim_);
+  }
+  elem->lru = lru_.insert({Clock::now(), x.first});
+  return elem.get();
+}
+
+void RepoCache::Free(Time cutoff) {
+  while (true) {
+    if (lru_.empty()) break;
+    auto it = lru_.begin();
+    if (it->first > cutoff) break;
+    Erase(it->second);
+  }
+}
+
+void RepoCache::Erase(Cache::iterator it) {
+  if (it == cache_.end()) return;
+  LOG(INFO) << "Closing repository: " << Print(it->first);
+  lru_.erase(it->second->lru);
+  cache_.erase(it);
+}
+
+}  // namespace gitstatus

gitstatus/src/repo_cache.h

@@ -0,0 +1,60 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_REPO_CACHE_H_
+#define ROMKATV_GITSTATUS_REPO_CACHE_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <utility>
+
+#include <git2.h>
+
+#include "options.h"
+#include "repo.h"
+#include "time.h"
+
+namespace gitstatus {
+
+class RepoCache {
+ public:
+  explicit RepoCache(Limits lim) : lim_(std::move(lim)) {}
+  Repo* Open(const std::string& dir, bool from_dotgit);
+  void Free(Time cutoff);
+
+ private:
+  struct Entry;
+  using Cache = std::unordered_map<std::string, std::unique_ptr<Entry>>;
+  using LRU = std::multimap<Time, Cache::iterator>;
+
+  void Erase(Cache::iterator it);
+
+  Limits lim_;
+  Cache cache_;
+  LRU lru_;
+
+  struct Entry : Repo {
+    using Repo::Repo;
+    LRU::iterator lru;
+  };
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_REPO_CACHE_H_

gitstatus/src/request.cc

@@ -0,0 +1,130 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "request.h"
+
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/select.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <cstdlib>
+#include <iostream>
+
+#include "check.h"
+#include "logging.h"
+#include "print.h"
+#include "serialization.h"
+
+namespace gitstatus {
+
+namespace {
+
+Request ParseRequest(const std::string& s) {
+  Request res;
+  auto begin = s.begin(), end = s.end(), sep = std::find(begin, end, kFieldSep);
+  VERIFY(sep != end) << "Malformed request: " << s;
+  res.id.assign(begin, sep);
+
+  begin = sep + 1;
+  if (*begin == ':') {
+    res.from_dotgit = true;
+    ++begin;
+  }
+  sep = std::find(begin, end, kFieldSep);
+  res.dir.assign(begin, sep);
+  if (sep == end) return res;
+
+  begin = sep + 1;
+  VERIFY(begin + 1 == end && (*begin == '0' || *begin == '1')) << "Malformed request: " << s;
+  res.diff = *begin == '0';
+  return res;
+}
+
+bool IsLockedFd(int fd) {
+  CHECK(fd >= 0);
+  struct flock flock = {};
+  flock.l_type = F_RDLCK;
+  flock.l_whence = SEEK_SET;
+  CHECK(fcntl(fd, F_GETLK, &flock) != -1) << Errno();
+  return flock.l_type != F_UNLCK;
+}
+
+}  // namespace
+
+std::ostream& operator<<(std::ostream& strm, const Request& req) {
+  strm << Print(req.id) << " for " << Print(req.dir);
+  if (req.from_dotgit) strm << " [from-dotgit]";
+  if (!req.diff) strm << " [no-diff]";
+  return strm;
+}
+
+RequestReader::RequestReader(int fd, int lock_fd, int parent_pid)
+    : fd_(fd), lock_fd_(lock_fd), parent_pid_(parent_pid) {
+  CHECK(fd != lock_fd);
+}
+
+bool RequestReader::ReadRequest(Request& req) {
+  auto eol = std::find(read_.begin(), read_.end(), kMsgSep);
+  if (eol != read_.end()) {
+    std::string msg(read_.begin(), eol);
+    read_.erase(read_.begin(), eol + 1);
+    req = ParseRequest(msg);
+    return true;
+  }
+
+  char buf[256];
+  while (true) {
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(fd_, &fds);
+    struct timeval timeout = {.tv_sec = 1};
+
+    int n;
+    CHECK((n = select(fd_ + 1, &fds, NULL, NULL, &timeout)) >= 0) << Errno();
+    if (n == 0) {
+      if (lock_fd_ >= 0 && !IsLockedFd(lock_fd_)) {
+        LOG(INFO) << "Lock on fd " << lock_fd_ << " is gone. Exiting.";
+        std::exit(0);
+      }
+      if (parent_pid_ >= 0 && kill(parent_pid_, 0)) {
+        LOG(INFO) << "Unable to send signal 0 to " << parent_pid_ << ". Exiting.";
+        std::exit(0);
+      }
+      req = {};
+      return false;
+    }
+
+    CHECK((n = read(fd_, buf, sizeof(buf))) >= 0) << Errno();
+    if (n == 0) {
+      LOG(INFO) << "EOF. Exiting.";
+      std::exit(0);
+    }
+    read_.insert(read_.end(), buf, buf + n);
+    int eol = std::find(buf, buf + n, kMsgSep) - buf;
+    if (eol != n) {
+      std::string msg(read_.begin(), read_.end() - (n - eol));
+      read_.erase(read_.begin(), read_.begin() + msg.size() + 1);
+      req = ParseRequest(msg);
+      return true;
+    }
+  }
+}
+
+}  // namespace gitstatus

gitstatus/src/request.h

@@ -0,0 +1,50 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_REQUEST_H_
+#define ROMKATV_GITSTATUS_REQUEST_H_
+
+#include <deque>
+#include <ostream>
+#include <string>
+
+namespace gitstatus {
+
+struct Request {
+  std::string id;
+  std::string dir;
+  bool from_dotgit = false;
+  bool diff = true;
+};
+
+std::ostream& operator<<(std::ostream& strm, const Request& req);
+
+class RequestReader {
+ public:
+  RequestReader(int fd, int lock_fd, int parent_pid);
+  bool ReadRequest(Request& req);
+
+ private:
+  int fd_;
+  int lock_fd_;
+  int parent_pid_;
+  std::deque<char> read_;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_REQUEST_H_

gitstatus/src/response.cc

@@ -0,0 +1,73 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "response.h"
+
+#include <cctype>
+#include <cstring>
+#include <iostream>
+
+#include "check.h"
+#include "serialization.h"
+
+namespace gitstatus {
+
+namespace {
+
+constexpr char kUnreadable = '?';
+
+void SafePrint(std::ostream& strm, StringView s) {
+  for (size_t i = 0; i != s.len; ++i) {
+    char c = s.ptr[i];
+    strm << (c > 127 || std::isprint(c) ? c : kUnreadable);
+  }
+}
+
+}  // namespace
+
+ResponseWriter::ResponseWriter(std::string request_id) : request_id_(std::move(request_id)) {
+  SafePrint(strm_, request_id_);
+  Print(1);
+}
+
+ResponseWriter::~ResponseWriter() {
+  if (!done_) {
+    strm_.str("");
+    SafePrint(strm_, request_id_);
+    Print("0");
+    Dump("without git status");
+  }
+}
+
+void ResponseWriter::Print(ssize_t val) {
+  strm_ << kFieldSep;
+  strm_ << val;
+}
+
+void ResponseWriter::Print(StringView val) {
+  strm_ << kFieldSep;
+  SafePrint(strm_, val);
+}
+
+void ResponseWriter::Dump(const char* log) {
+  CHECK(!done_);
+  done_ = true;
+  LOG(INFO) << "Replying " << log;
+  std::cout << strm_.str() << kMsgSep << std::flush;
+}
+
+}  // namespace gitstatus

gitstatus/src/response.h

@@ -0,0 +1,50 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_RESPONSE_H_
+#define ROMKATV_GITSTATUS_RESPONSE_H_
+
+#include <cstddef>
+#include <cstdint>
+#include <sstream>
+#include <string>
+
+#include "string_view.h"
+
+namespace gitstatus {
+
+class ResponseWriter {
+ public:
+  ResponseWriter(std::string request_id);
+  ResponseWriter(ResponseWriter&&) = delete;
+  ~ResponseWriter();
+
+  void Print(ssize_t val);
+  void Print(StringView val);
+  void Print(const char* val) { Print(StringView(val)); }
+
+  void Dump(const char* log);
+
+ private:
+  bool done_ = false;
+  std::string request_id_;
+  std::ostringstream strm_;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_RESPONSE_H_

gitstatus/src/scope_guard.h

@@ -0,0 +1,56 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_SCOPE_GUARD_H_
+#define ROMKATV_GITSTATUS_SCOPE_GUARD_H_
+
+#include <utility>
+
+#define ON_SCOPE_EXIT(capture...)                                     \
+  auto GITSTATUS_INTERNAL_CAT(_gitstatus_scope_guard_, __COUNTER__) = \
+      ::gitstatus::internal_scope_guard::ScopeGuardGenerator() = [capture]()
+
+#define GITSTATUS_INTERNAL_CAT_I(x, y) x##y
+#define GITSTATUS_INTERNAL_CAT(x, y) GITSTATUS_INTERNAL_CAT_I(x, y)
+
+namespace gitstatus {
+namespace internal_scope_guard {
+
+void Undefined();
+
+template <class F>
+class ScopeGuard {
+ public:
+  explicit ScopeGuard(F f) : f_(std::move(f)) {}
+  ~ScopeGuard() { std::move(f_)(); }
+  ScopeGuard(ScopeGuard&& other) : f_(std::move(other.f_)) { Undefined(); }
+
+ private:
+  F f_;
+};
+
+struct ScopeGuardGenerator {
+  template <class F>
+  ScopeGuard<F> operator=(F f) const {
+    return ScopeGuard<F>(std::move(f));
+  }
+};
+
+}  // namespace internal_scope_guard
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_SCOPE_GUARD_H_

gitstatus/src/serialization.h

@@ -0,0 +1,28 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_SERIALIZATION_H_
+#define ROMKATV_GITSTATUS_SERIALIZATION_H_
+
+namespace gitstatus {
+
+constexpr char kFieldSep = 31;  // ascii 31 is unit separator
+constexpr char kMsgSep = 30;    // ascii 30 is record separator
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_SERIALIZATION_H_

gitstatus/src/stat.h

@@ -0,0 +1,23 @@
+#ifndef ROMKATV_GITSTATUS_STAT_H_
+#define ROMKATV_GITSTATUS_STAT_H_
+
+#include <sys/stat.h>
+
+namespace gitstatus {
+
+inline const struct timespec& MTim(const struct stat& s) {
+#ifdef __APPLE__
+  return s.st_mtimespec;
+#else
+  return s.st_mtim;
+#endif
+}
+
+inline bool StatEq(const struct stat& x, const struct stat& y) {
+  return MTim(x).tv_sec == MTim(y).tv_sec && MTim(x).tv_nsec == MTim(y).tv_nsec &&
+         x.st_size == y.st_size && x.st_ino == y.st_ino && x.st_mode == y.st_mode;
+}
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_STAT_H_

gitstatus/src/string_cmp.h

@@ -0,0 +1,151 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_STRING_CMP_H_
+#define ROMKATV_GITSTATUS_STRING_CMP_H_
+
+#include <string.h>  // because there is no std::strcasecmp in C++
+
+#include <algorithm>
+#include <cctype>
+#include <cstddef>
+#include <cstring>
+
+#include "string_view.h"
+
+namespace gitstatus {
+
+// WARNING: These routines assume no embedded null characters in StringView. Violations cause UB.
+
+template <int kCaseSensitive = -1>
+struct StrCmp;
+
+template <>
+struct StrCmp<0> {
+  int operator()(StringView x, StringView y) const {
+    size_t n = std::min(x.len, y.len);
+    int cmp = strncasecmp(x.ptr, y.ptr, n);
+    if (cmp) return cmp;
+    return static_cast<ssize_t>(x.len) - static_cast<ssize_t>(y.len);
+  }
+
+  int operator()(StringView x, const char* y) const {
+    for (const char *p = x.ptr, *e = p + x.len; p != e; ++p, ++y) {
+      if (int cmp = std::tolower(*p) - std::tolower(*y)) return cmp;
+    }
+    return 0 - *y;
+  }
+
+  int operator()(char x, char y) const { return std::tolower(x) - std::tolower(y); }
+  int operator()(const char* x, const char* y) const { return strcasecmp(x, y); }
+  int operator()(const char* x, StringView y) const { return -operator()(y, x); }
+};
+
+template <>
+struct StrCmp<1> {
+  int operator()(StringView x, StringView y) const {
+    size_t n = std::min(x.len, y.len);
+    int cmp = std::memcmp(x.ptr, y.ptr, n);
+    if (cmp) return cmp;
+    return static_cast<ssize_t>(x.len) - static_cast<ssize_t>(y.len);
+  }
+
+  int operator()(StringView x, const char* y) const {
+    for (const char *p = x.ptr, *e = p + x.len; p != e; ++p, ++y) {
+      if (int cmp = *p - *y) return cmp;
+    }
+    return 0 - *y;
+  }
+
+  int operator()(char x, char y) const { return x - y; }
+  int operator()(const char* x, const char* y) const { return std::strcmp(x, y); }
+  int operator()(const char* x, StringView y) const { return -operator()(y, x); }
+};
+
+template <>
+struct StrCmp<-1> {
+  explicit StrCmp(bool case_sensitive) : case_sensitive(case_sensitive) {}
+
+  template <class X, class Y>
+  int operator()(const X& x, const Y& y) const {
+    return case_sensitive ? StrCmp<1>()(x, y) : StrCmp<0>()(x, y);
+  }
+
+  bool case_sensitive;
+};
+
+template <int kCaseSensitive = -1>
+struct StrLt : private StrCmp<kCaseSensitive> {
+  using StrCmp<kCaseSensitive>::StrCmp;
+
+  template <class X, class Y>
+  bool operator()(const X& x, const Y& y) const {
+    return StrCmp<kCaseSensitive>::operator()(x, y) < 0;
+  }
+};
+
+template <int kCaseSensitive = -1>
+struct StrEq : private StrCmp<kCaseSensitive> {
+  using StrCmp<kCaseSensitive>::StrCmp;
+
+  template <class X, class Y>
+  bool operator()(const X& x, const Y& y) const {
+    return StrCmp<kCaseSensitive>::operator()(x, y) == 0;
+  }
+
+  bool operator()(const StringView& x, const StringView& y) const {
+    return x.len == y.len && StrCmp<kCaseSensitive>::operator()(x, y) == 0;
+  }
+};
+
+template <int kCaseSensitive = -1>
+struct Str {
+  static_assert(kCaseSensitive == 0 || kCaseSensitive == 1, "");
+
+  static const bool case_sensitive = kCaseSensitive;
+
+  StrCmp<kCaseSensitive> Cmp;
+  StrLt<kCaseSensitive> Lt;
+  StrEq<kCaseSensitive> Eq;
+};
+
+template <int kCaseSensitive>
+const bool Str<kCaseSensitive>::case_sensitive;
+
+template <>
+struct Str<-1> {
+  explicit Str(bool case_sensitive)
+      : case_sensitive(case_sensitive),
+        Cmp(case_sensitive),
+        Lt(case_sensitive),
+        Eq(case_sensitive) {}
+
+  bool case_sensitive;
+
+  StrCmp<-1> Cmp;
+  StrLt<-1> Lt;
+  StrEq<-1> Eq;
+};
+
+template <class Iter>
+void StrSort(Iter begin, Iter end, bool case_sensitive) {
+  case_sensitive ? std::sort(begin, end, StrLt<true>()) : std::sort(begin, end, StrLt<false>());
+}
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_STRING_CMP_H_

gitstatus/src/string_view.h

@@ -0,0 +1,77 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_STRING_VIEW_H_
+#define ROMKATV_GITSTATUS_STRING_VIEW_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstring>
+#include <ostream>
+#include <string>
+
+namespace gitstatus {
+
+// WARNING: StringView must not have embedded null characters. Violations cause UB.
+struct StringView {
+  StringView() : StringView("") {}
+
+  // Requires: !memchr(s.data(), 0, s.size()).
+  //
+  // WARNING: The existence of this requirement and the fact that this constructor is implicit
+  // means it's dangerous to have std::string instances with embedded null characters anywhere
+  // in the program. If you have an std::string `s` with embedded nulls, an innocent-looking
+  // `F(s)` might perform an implicit conversion to StringView and land you squarely in the
+  // Undefined Behavior land.
+  StringView(const std::string& s) : StringView(s.c_str(), s.size()) {}
+
+  // Requires: !memchr(ptr, 0, len).
+  StringView(const char* ptr, size_t len) : ptr(ptr), len(len) {}
+
+  // Requires: end >= begin && !memchr(begin, 0, end - begin).
+  StringView(const char* begin, const char* end) : StringView(begin, end - begin) {}
+
+  // Requires: strchr(s, 0) == s + N.
+  template <size_t N>
+  StringView(const char (&s)[N]) : StringView(s, N - 1) {
+    static_assert(N, "");
+  }
+
+  // Explicit because it's the only constructor that isn't O(1).
+  // Are you sure you don't already known the strings's length?
+  explicit StringView(const char* ptr) : StringView(ptr, ptr ? std::strlen(ptr) : 0) {}
+
+  bool StartsWith(StringView prefix) const {
+    return len >= prefix.len && !std::memcmp(ptr, prefix.ptr, prefix.len);
+  }
+
+  bool EndsWith(StringView suffix) const {
+    return len >= suffix.len && !std::memcmp(ptr + (len - suffix.len), suffix.ptr, suffix.len);
+  }
+
+  const char* ptr;
+  size_t len;
+};
+
+inline std::ostream& operator<<(std::ostream& strm, StringView s) {
+  if (s.ptr) strm.write(s.ptr, s.len);
+  return strm;
+}
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_STRING_VIEW_H_

gitstatus/src/strings.cc

@@ -0,0 +1,71 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include <cassert>
+
+#include "strings.h"
+
+namespace gitstatus {
+
+void CEscape(std::ostream& strm, const char* begin, const char* end) {
+  assert(!begin == !end);
+  if (!begin) return;
+  for (; begin != end; ++begin) {
+    const unsigned char c = *begin;
+    switch (c) {
+      case '\t':
+        strm << "\\t";
+        continue;
+      case '\n':
+        strm << "\\n";
+        continue;
+      case '\r':
+        strm << "\\r";
+        continue;
+      case '"':
+        strm << "\\\"";
+        continue;
+      case '\'':
+        strm << "\\'";
+        continue;
+      case '\\':
+        strm << "\\\\";
+        continue;
+    }
+    if (c > 31 && c < 127) {
+      strm << c;
+      continue;
+    }
+    strm << '\\';
+    strm << static_cast<char>('0' + ((c >> 6) & 7));
+    strm << static_cast<char>('0' + ((c >> 3) & 7));
+    strm << static_cast<char>('0' + ((c >> 0) & 7));
+  }
+}
+
+void Quote(std::ostream& strm, const char* begin, const char* end) {
+  assert(!begin == !end);
+  if (!begin) {
+    strm << "null";
+    return;
+  }
+  strm << '"';
+  CEscape(strm, begin, end);
+  strm << '"';
+}
+
+}  // namespace gitstatus

gitstatus/src/strings.h

@@ -0,0 +1,37 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_STRINGS_H_
+#define ROMKATV_GITSTATUS_STRINGS_H_
+
+#include <ostream>
+
+namespace gitstatus {
+
+// If the pointers are null, prints nothing.
+//
+// Requires: !begin == !end.
+void CEscape(std::ostream& strm, const char* begin, const char* end);
+
+// If the pointers are null, prints null without quotes.
+//
+// Requires: !begin == !end.
+void Quote(std::ostream& strm, const char* begin, const char* end);
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_STRING_VIEW_H_

gitstatus/src/tag_db.cc

@@ -0,0 +1,332 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "tag_db.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <cstdlib>
+#include <cstring>
+#include <iterator>
+#include <utility>
+
+#include "check.h"
+#include "dir.h"
+#include "git.h"
+#include "print.h"
+#include "scope_guard.h"
+#include "stat.h"
+#include "string_cmp.h"
+#include "thread_pool.h"
+#include "timer.h"
+
+namespace gitstatus {
+
+namespace {
+
+using namespace std::string_literals;
+
+static constexpr char kTagPrefix[] = "refs/tags/";
+
+constexpr int8_t kUnhex[256] = {
+    0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  // 0
+    0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  // 1
+    0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  // 2
+    0, 1,  2,  3,  4,  5,  6,  7, 8, 9, 0, 0, 0, 0, 0, 0,  // 3
+    0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 4
+    0, 0,  0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0,  // 5
+    0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0   // 6
+};
+
+struct {
+  bool operator()(const Tag* x, const git_oid& y) const {
+    return std::memcmp(x->id.id, y.id, GIT_OID_RAWSZ) < 0;
+  }
+  bool operator()(const git_oid& x, const Tag* y) const {
+    return std::memcmp(x.id, y->id.id, GIT_OID_RAWSZ) < 0;
+  }
+  bool operator()(const Tag* x, const Tag* y) const {
+    return std::memcmp(x->id.id, y->id.id, GIT_OID_RAWSZ) < 0;
+  }
+} constexpr ById = {};
+
+struct {
+  bool operator()(const Tag* x, const char* y) const {
+    return std::strcmp(x->name, y) < 0;
+  }
+  bool operator()(const char* x, const Tag* y) const {
+    return std::strcmp(x, y->name) < 0;
+  }
+  bool operator()(const Tag* x, const Tag* y) const {
+    return std::strcmp(x->name, y->name) < 0;
+  }
+} constexpr ByName = {};
+
+void ParseOid(unsigned char* oid, const char* begin, const char* end) {
+  VERIFY(end >= begin + GIT_OID_HEXSZ);
+  for (size_t i = 0; i != GIT_OID_HEXSZ; i += 2) {
+    *oid++ = kUnhex[+begin[i]] << 4 | kUnhex[+begin[i + 1]];
+  }
+}
+
+const char* StripTag(const char* ref) {
+  for (size_t i = 0; i != sizeof(kTagPrefix) - 1; ++i) {
+    if (*ref++ != kTagPrefix[i]) return nullptr;
+  }
+  return ref;
+}
+
+git_refdb* RefDb(git_repository* repo) {
+  git_refdb* res;
+  VERIFY(!git_repository_refdb(&res, repo)) << GitError();
+  return res;
+}
+
+}  // namespace
+
+TagDb::TagDb(git_repository* repo)
+    : repo_(repo),
+      refdb_(RefDb(repo)),
+      pack_(&pack_arena_),
+      name2id_(&pack_arena_),
+      id2name_(&pack_arena_) {
+  CHECK(repo_ && refdb_);
+}
+
+TagDb::~TagDb() {
+  Wait();
+  git_refdb_free(refdb_);
+}
+
+std::string TagDb::TagForCommit(const git_oid& oid) {
+  ReadLooseTags();
+  UpdatePack();
+
+  std::string res;
+
+  std::string ref = "refs/tags/";
+  size_t prefix_len = ref.size();
+  for (const char* tag : loose_tags_) {
+    ref.resize(prefix_len);
+    ref += tag;
+    if (res < tag && TagHasTarget(ref.c_str(), &oid)) res = tag;
+  }
+
+  if ((std::unique_lock<std::mutex>(mutex_), id2name_dirty_)) {
+    for (auto it = name2id_.rbegin(); it != name2id_.rend(); ++it) {
+      if (!memcmp((*it)->id.id, oid.id, GIT_OID_RAWSZ) && !IsLooseTag((*it)->name)) {
+        if (res < (*it)->name) res = (*it)->name;
+        break;
+      }
+    }
+  } else {
+    auto r = std::equal_range(id2name_.begin(), id2name_.end(), oid, ById);
+    for (auto it = r.first; it != r.second; ++it) {
+      if (!IsLooseTag((*it)->name) && res < (*it)->name) res = (*it)->name;
+    }
+  }
+
+  return res;
+}
+
+void TagDb::ReadLooseTags() {
+  loose_tags_.clear();
+  loose_arena_.Reuse();
+
+  std::string dirname = git_repository_path(repo_) + "refs/tags"s;
+  int dir_fd = open(dirname.c_str(), O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  if (dir_fd < 0) return;
+  ON_SCOPE_EXIT(&) { CHECK(!close(dir_fd)) << Errno(); };
+  // TODO: recursively traverse directories so that the file refs/tags/foo/bar gets interpreted
+  // as the tag foo/bar. See https://github.com/romkatv/gitstatus/issues/254.
+  (void)ListDir(dir_fd, loose_arena_, loose_tags_, /* precompose_unicode = */ false,
+                /* case_sensitive = */ true);
+}
+
+void TagDb::UpdatePack() {
+  auto Reset = [&] {
+    auto Wipe = [](auto& x) {
+      x.clear();
+      x.shrink_to_fit();
+    };
+    Wait();
+    Wipe(pack_);
+    Wipe(name2id_);
+    Wipe(id2name_);
+    pack_arena_.Reuse();
+    std::memset(&pack_stat_, 0, sizeof(pack_stat_));
+  };
+
+  std::string pack_path = git_repository_path(repo_) + "packed-refs"s;
+  struct stat st;
+  if (stat(pack_path.c_str(), &st)) {
+    Reset();
+    return;
+  }
+  if (StatEq(pack_stat_, st)) return;
+
+  Reset();
+
+  try {
+    while (true) {
+      LOG(INFO) << "Parsing " << Print(pack_path);
+      int fd = open(pack_path.c_str(), O_RDONLY | O_CLOEXEC);
+      VERIFY(fd >= 0);
+      ON_SCOPE_EXIT(&) { CHECK(!close(fd)) << Errno(); };
+      pack_.resize(st.st_size + 1);
+      ssize_t n = read(fd, &pack_[0], st.st_size + 1);
+      VERIFY(n >= 0) << Errno();
+      VERIFY(!fstat(fd, &pack_stat_)) << Errno();
+      if (!StatEq(st, pack_stat_)) {
+        st = pack_stat_;
+        continue;
+      }
+      VERIFY(n == st.st_size);
+      pack_.pop_back();
+      break;
+    }
+    ParsePack();
+  } catch (const Exception&) {
+    Reset();
+    throw;
+  }
+}
+
+void TagDb::ParsePack() {
+  char* p = &pack_[0];
+  char* e = p + pack_.size();
+
+  // Usually packed-refs starts with the following line:
+  //
+  //   # pack-refs with: peeled fully-peeled sorted
+  //
+  // However, some users can produce pack-refs without this line.
+  // See https://github.com/romkatv/powerlevel10k/issues/1428.
+  // I don't know how they do it. Without the header line we cannot
+  // assume that refs are sorted, which isn't a big deal because we
+  // can just sort them. What's worse is that refs cannot be assumed
+  // to be fully-peeled. We don't want to peel them, so we just drop
+  // all tags.
+  if (*p != '#') {
+    LOG(WARN) << "packed-refs doesn't have a header. Won't resolve tags.";
+    return;
+  }
+
+  char* eol = std::strchr(p, '\n');
+  if (!eol) return;
+  *eol = 0;
+  if (!std::strstr(p, " fully-peeled") || !std::strstr(p, " sorted")) {
+    LOG(WARN) << "packed-refs has unexpected header. Won't resolve tags.";
+  }
+  p = eol + 1;
+
+  name2id_.reserve(pack_.size() / 128);
+  id2name_.reserve(pack_.size() / 128);
+
+  std::vector<Tag*> idx;
+  idx.reserve(pack_.size() / 128);
+
+  while (p != e) {
+    Tag* tag = pack_arena_.Allocate<Tag>();
+    ParseOid(tag->id.id, p, e);
+    p += GIT_OID_HEXSZ;
+    VERIFY(*p++ == ' ');
+    const char* ref = p;
+    VERIFY(p = std::strchr(p, '\n'));
+    p[p[-1] == '\r' ? -1 : 0] = 0;
+    ++p;
+    if (*p == '^') {
+      ParseOid(tag->id.id, p + 1, e);
+      p += GIT_OID_HEXSZ + 1;
+      if (p != e) {
+        VERIFY((p = std::strchr(p, '\n')));
+        ++p;
+      }
+    }
+    tag->name = StripTag(ref);
+    if (!tag->name) continue;
+    name2id_.push_back(tag);
+    id2name_.push_back(tag);
+  }
+
+  if (!std::is_sorted(name2id_.begin(), name2id_.end(), ByName)) {
+    // "sorted" in the header of packed-refs promises that this won't trigger.
+    std::sort(name2id_.begin(), name2id_.end(), ByName);
+  }
+
+  id2name_dirty_ = true;
+  GlobalThreadPool()->Schedule([this] {
+    std::sort(id2name_.begin(), id2name_.end(), ById);
+    std::unique_lock<std::mutex> lock(mutex_);
+    CHECK(id2name_dirty_);
+    id2name_dirty_ = false;
+    cv_.notify_one();
+  });
+}
+
+void TagDb::Wait() {
+  std::unique_lock<std::mutex> lock(mutex_);
+  while (id2name_dirty_) cv_.wait(lock);
+}
+
+bool TagDb::IsLooseTag(const char* name) const {
+  return std::binary_search(loose_tags_.begin(), loose_tags_.end(), name,
+                            [](const char* a, const char* b) { return std::strcmp(a, b) < 0; });
+}
+
+bool TagDb::TagHasTarget(const char* name, const git_oid* target) const {
+  static constexpr size_t kMaxDerefCount = 10;
+
+  git_reference* ref;
+  if (git_refdb_lookup(&ref, refdb_, name)) return false;
+  ON_SCOPE_EXIT(&) { git_reference_free(ref); };
+
+  for (int i = 0; i != kMaxDerefCount && git_reference_type(ref) == GIT_REFERENCE_SYMBOLIC; ++i) {
+    git_reference* dst;
+    const char* ref_name = git_reference_name(ref);
+    if (git_refdb_lookup(&dst, refdb_, ref_name)) {
+      const char* tag_name = StripTag(ref_name);
+      auto it = std::lower_bound(name2id_.begin(), name2id_.end(), tag_name, ByName);
+      return it != name2id_.end() && !strcmp((*it)->name, tag_name) && !IsLooseTag(tag_name) &&
+             git_oid_equal(&(*it)->id, target);
+    }
+    git_reference_free(ref);
+    ref = dst;
+  }
+
+  if (git_reference_type(ref) == GIT_REFERENCE_SYMBOLIC) return false;
+  const git_oid* oid = git_reference_target_peel(ref) ?: git_reference_target(ref);
+  if (git_oid_equal(oid, target)) return true;
+
+  for (int i = 0; i != kMaxDerefCount; ++i) {
+    git_tag* tag;
+    if (git_tag_lookup(&tag, repo_, oid)) return false;
+    ON_SCOPE_EXIT(&) { git_tag_free(tag); };
+    if (git_tag_target_type(tag) == GIT_OBJECT_COMMIT) {
+      return git_oid_equal(git_tag_target_id(tag), target);
+    }
+    oid = git_tag_target_id(tag);
+  }
+
+  return false;
+}
+
+}  // namespace gitstatus

gitstatus/src/tag_db.h

@@ -0,0 +1,79 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_TAG_DB_H_
+#define ROMKATV_GITSTATUS_TAG_DB_H_
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <git2.h>
+
+#include <condition_variable>
+#include <cstring>
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include "arena.h"
+
+namespace gitstatus {
+
+struct Tag {
+  const char* name;
+  git_oid id;
+};
+
+class TagDb {
+ public:
+  explicit TagDb(git_repository* repo);
+  TagDb(TagDb&&) = delete;
+  ~TagDb();
+
+  std::string TagForCommit(const git_oid& oid);
+
+ private:
+  void ReadLooseTags();
+  void UpdatePack();
+  void ParsePack();
+  void Wait();
+
+  bool IsLooseTag(const char* name) const;
+
+  bool TagHasTarget(const char* name, const git_oid* target) const;
+
+  git_repository* const repo_;
+  git_refdb* const refdb_;
+
+  Arena pack_arena_;
+  struct stat pack_stat_ = {};
+  WithArena<std::string> pack_;
+  WithArena<std::vector<const Tag*>> name2id_;
+  WithArena<std::vector<const Tag*>> id2name_;
+
+  Arena loose_arena_;
+  std::vector<char*> loose_tags_;
+
+  std::mutex mutex_;
+  std::condition_variable cv_;
+  bool id2name_dirty_ = false;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_TAG_DB_H_

gitstatus/src/thread_pool.cc

@@ -0,0 +1,87 @@
+#include "thread_pool.h"
+
+#include <cassert>
+#include <utility>
+
+#include "check.h"
+#include "logging.h"
+
+namespace gitstatus {
+
+ThreadPool::ThreadPool(size_t num_threads) : num_inflight_(num_threads) {
+  for (size_t i = 0; i != num_threads; ++i) {
+    threads_.emplace_back([=]() { Loop(i + 1); });
+  }
+}
+
+ThreadPool::~ThreadPool() {
+  {
+    std::lock_guard<std::mutex> lock(mutex_);
+    exit_ = true;
+  }
+  cv_.notify_all();
+  sleeper_cv_.notify_one();
+  for (std::thread& t : threads_) t.join();
+}
+
+void ThreadPool::Schedule(Time t, std::function<void()> f) {
+  std::condition_variable* wake = nullptr;
+  {
+    std::unique_lock<std::mutex> lock(mutex_);
+    work_.push(Work{std::move(t), ++last_idx_, std::move(f)});
+    if (work_.top().idx == last_idx_) wake = have_sleeper_ ? &sleeper_cv_ : &cv_;
+  }
+  if (wake) wake->notify_one();
+}
+
+void ThreadPool::Loop(size_t tid) {
+  auto Next = [&]() -> std::function<void()> {
+    std::unique_lock<std::mutex> lock(mutex_);
+    --num_inflight_;
+    if (work_.empty() && num_inflight_ == 0) idle_cv_.notify_all();
+    while (true) {
+      if (exit_) return nullptr;
+      if (work_.empty()) {
+        cv_.wait(lock);
+        continue;
+      }
+      Time now = Clock::now();
+      const Work& top = work_.top();
+      if (top.t <= now) {
+        std::function<void()> res = std::move(top.f);
+        work_.pop();
+        ++num_inflight_;
+        bool notify = !work_.empty() && !have_sleeper_;
+        lock.unlock();
+        if (notify) cv_.notify_one();
+        return res;
+      }
+      if (have_sleeper_) {
+        cv_.wait(lock);
+        continue;
+      }
+      have_sleeper_ = true;
+      sleeper_cv_.wait_until(lock, top.t);
+      assert(have_sleeper_);
+      have_sleeper_ = false;
+    }
+  };
+  while (std::function<void()> f = Next()) f();
+}
+
+void ThreadPool::Wait() {
+  std::unique_lock<std::mutex> lock(mutex_);
+  idle_cv_.wait(lock, [&] { return work_.empty() && num_inflight_ == 0; });
+}
+
+static ThreadPool* g_thread_pool = nullptr;
+
+void InitGlobalThreadPool(size_t num_threads) {
+  CHECK(!g_thread_pool);
+  LOG(INFO) << "Spawning " << num_threads << " thread(s)";
+  g_thread_pool = new ThreadPool(num_threads);
+}
+
+ThreadPool* GlobalThreadPool() { return g_thread_pool; }
+
+}  // namespace gitstatus

gitstatus/src/thread_pool.h

@@ -0,0 +1,74 @@
+#ifndef ROMKATV_GITSTATUS_THREAD_POOL_H_
+#define ROMKATV_GITSTATUS_THREAD_POOL_H_
+
+#include <condition_variable>
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <mutex>
+#include <queue>
+#include <thread>
+#include <tuple>
+#include <utility>
+
+#include "time.h"
+
+namespace gitstatus {
+
+class ThreadPool {
+ public:
+  explicit ThreadPool(size_t num_threads);
+  ThreadPool(ThreadPool&&) = delete;
+
+  // Waits for the currently running functions to finish.
+  // Does NOT wait for the queue of functions to drain.
+  // If you want the latter, call Wait() manually.
+  ~ThreadPool();
+
+  // Runs `f` on one of the threads at or after time `t`. Can be called
+  // from any thread. Can be called concurrently.
+  //
+  // Does not block.
+  void Schedule(Time t, std::function<void()> f);
+
+  void Schedule(std::function<void()> f) { Schedule(Clock::now(), std::move(f)); }
+
+  // Blocks until the work queue is empty and there are no currently
+  // running functions.
+  void Wait();
+
+  size_t num_threads() const { return threads_.size(); }
+
+ private:
+  struct Work {
+    bool operator<(const Work& w) const { return std::tie(w.t, w.idx) < std::tie(t, idx); }
+    Time t;
+    int64_t idx;
+    mutable std::function<void()> f;
+  };
+
+  void Loop(size_t tid);
+
+  int64_t last_idx_ = 0;
+  int64_t num_inflight_;
+  bool exit_ = false;
+  // Do we have a thread waiting on sleeper_cv_?
+  bool have_sleeper_ = false;
+  std::mutex mutex_;
+  // Any number of threads can wait on this condvar. Always without a timeout.
+  std::condition_variable cv_;
+  // At most one thread can wait on this condvar at a time. Always with a timeout.
+  std::condition_variable sleeper_cv_;
+  // Signalled when the work queue is empty and there is nothing inflight.
+  std::condition_variable idle_cv_;
+  std::priority_queue<Work> work_;
+  std::vector<std::thread> threads_;
+};
+
+void InitGlobalThreadPool(size_t num_threads);
+
+ThreadPool* GlobalThreadPool();
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_THREAD_POOL_H_

gitstatus/src/time.h

@@ -0,0 +1,14 @@
+#ifndef ROMKATV_GITSTATUS_TIME_H_
+#define ROMKATV_GITSTATUS_TIME_H_
+
+#include <chrono>
+
+namespace gitstatus {
+
+using Clock = std::chrono::steady_clock;
+using Time = Clock::time_point;
+using Duration = Clock::duration;
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_TIME_H_

gitstatus/src/timer.cc

@@ -0,0 +1,72 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#include "timer.h"
+
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include <cmath>
+#include <limits>
+
+#include "check.h"
+#include "logging.h"
+
+namespace gitstatus {
+
+namespace {
+
+double CpuTimeMs() {
+  auto ToMs = [](const timeval& tv) { return 1e3 * tv.tv_sec + 1e-3 * tv.tv_usec; };
+  rusage usage = {};
+  CHECK(getrusage(RUSAGE_SELF, &usage) == 0) << Errno();
+  return ToMs(usage.ru_utime) + ToMs(usage.ru_stime);
+}
+
+double WallTimeMs() {
+  // An attempt to call clock_gettime on an ancient version of MacOS fails at runtime.
+  // It's possible to detect the presence of clock_gettime at runtime but I don't have
+  // an ancient MacOS to test the code. Hence this.
+#ifdef __APPLE__
+  return std::numeric_limits<double>::quiet_NaN();
+#else
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return 1e3 * ts.tv_sec + 1e-6 * ts.tv_nsec;
+#endif
+}
+
+}  // namespace
+
+void Timer::Start() {
+  cpu_ = CpuTimeMs();
+  wall_ = WallTimeMs();
+}
+
+void Timer::Report(const char* msg) {
+  double cpu = CpuTimeMs() - cpu_;
+  if (std::isnan(wall_)) {
+    LOG(INFO) << "Timing for: " << msg << ": " << cpu << "ms cpu";
+  } else {
+    double wall = WallTimeMs() - wall_;
+    LOG(INFO) << "Timing for: " << msg << ": " << cpu << "ms cpu, " << wall << "ms wall";
+  }
+  Start();
+}
+
+}  // namespace gitstatus

gitstatus/src/timer.h

@@ -0,0 +1,36 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_TIMER_H_
+#define ROMKATV_GITSTATUS_TIMER_H_
+
+namespace gitstatus {
+
+class Timer {
+ public:
+  Timer() { Start(); }
+  void Start();
+  void Report(const char* msg);
+
+ private:
+  double cpu_;
+  double wall_;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_TIMER_H_

gitstatus/src/tribool.h

@@ -0,0 +1,27 @@
+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_TRIBOOL_H_
+#define ROMKATV_GITSTATUS_TRIBOOL_H_
+
+namespace gitstatus {
+
+enum class Tribool : int { kFalse = 0, kTrue = 1, kUnknown = -1 };
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_TRIBOOL_H_

internal/configure.zsh

@@ -1,11 +1,9 @@
-typeset -gr __p9k_wizard_columns=55
-typeset -gr __p9k_wizard_lines=21
+# Fewer than 47 columns will probably work. Haven't tried it.
+typeset -gr __p9k_wizard_columns=47
+# The bottleneck is ask_tails with nerd fonts. Everything else works fine with 12 lines.
+typeset -gr __p9k_wizard_lines=14
 typeset -gr __p9k_zd=${ZDOTDIR:-$HOME}
 typeset -gr __p9k_zd_u=${${${(q)__p9k_zd}/#(#b)${(q)HOME}(|\/*)/'~'$match[1]}//\%/%%}
-typeset -gr __p9k_cfg_basename=.p10k.zsh
-typeset -gr __p9k_cfg_path_o=$__p9k_zd/$__p9k_cfg_basename
-typeset -gr __p9k_cfg_path=${__p9k_cfg_path_o:A}
-typeset -gr __p9k_cfg_path_u=$__p9k_zd_u/$__p9k_cfg_basename
 typeset -gr __p9k_zshrc=${${:-$__p9k_zd/.zshrc}:A}
 typeset -gr __p9k_zshrc_u=$__p9k_zd_u/.zshrc
 typeset -gr __p9k_root_dir_u=${${${(q)__p9k_root_dir}/#(#b)${(q)HOME}(|\/*)/'~'$match[1]}//\%/%%}
@@ -15,14 +13,27 @@ function _p9k_can_configure() {
   function $0_error() {
     (( q )) || print -rP "%1F[ERROR]%f %Bp10k configure%b: $1" >&2
   }
+  typeset -g __p9k_cfg_path_o=${POWERLEVEL9K_CONFIG_FILE:=${ZDOTDIR:-~}/.p10k.zsh}
+  typeset -g __p9k_cfg_basename=${__p9k_cfg_path_o:t}
+  typeset -g __p9k_cfg_path=${__p9k_cfg_path_o:A}
+  typeset -g __p9k_cfg_path_u=${${${(q)__p9k_cfg_path_o}/#(#b)${(q)HOME}(|\/*)/'~'$match[1]}//\%/%%}
   {
-    [[ -o multibyte ]]         || { $0_error "multibyte option is not set";      return 1 }
     [[ -e $__p9k_zd ]]         || { $0_error "$__p9k_zd_u does not exist";       return 1 }
     [[ -d $__p9k_zd ]]         || { $0_error "$__p9k_zd_u is not a directory";   return 1 }
-    [[ -w $__p9k_zd ]]         || { $0_error "$__p9k_zd_u is not writable";      return 1 }
     [[ ! -d $__p9k_cfg_path ]] || { $0_error "$__p9k_cfg_path_u is a directory"; return 1 }
     [[ ! -d $__p9k_zshrc ]]    || { $0_error "$__p9k_zshrc_u is a directory";    return 1 }
 
+    local dir=${__p9k_cfg_path:h}
+    while [[ ! -e $dir && $dir != ${dir:h} ]]; do dir=${dir:h}; done
+    if [[ ! -d $dir ]]; then
+      $0_error "cannot create $__p9k_cfg_path_u because ${dir//\%/%%} is not a directory"
+      return 1
+    fi
+    if [[ ! -w $dir ]]; then
+      $0_error "cannot create $__p9k_cfg_path_u because ${dir//\%/%%} is readonly"
+      return 1
+    fi
+
     [[ ! -e $__p9k_cfg_path || -f $__p9k_cfg_path || -h $__p9k_cfg_path ]] || {
       $0_error "$__p9k_cfg_path_u is a special file"
       return 1
@@ -44,10 +55,13 @@ function _p9k_can_configure() {
     done
 
     (( LINES >= __p9k_wizard_lines && COLUMNS >= __p9k_wizard_columns ))   || {
-      $0_error "terminal size too small; must be at least $__p9k_wizard_columns x $__p9k_wizard_lines"
+      $0_error "terminal size too small; must be at least $__p9k_wizard_columns columns by $__p9k_wizard_lines lines"
       return 1
     }
-    [[ -t 0 && -t 1 ]]         || { $0_error "no TTY";                           return 2 }
+    [[ -t 0 && -t 1 ]]                                                     || {
+      $0_error "no TTY"
+      return 2
+    }
     return 0
   } always {
     unfunction $0_error
@@ -56,13 +70,14 @@ function _p9k_can_configure() {
 
 function p9k_configure() {
   eval "$__p9k_intro"
+  _p9k_can_configure || return
   (
     set -- -f
-    source $__p9k_root_dir/internal/wizard.zsh
+    builtin source $__p9k_root_dir/internal/wizard.zsh
   )
   local ret=$?
   case $ret in
-    0)  source $__p9k_cfg_path; _p9k__force_must_init=1;;
+    0)  builtin source $__p9k_cfg_path; _p9k__force_must_init=1;;
     69) return 0;;
     *)  return $ret;;
   esac

internal/icons.zsh

@@ -1,8 +1,9 @@
 typeset -gA icons
 
 function _p9k_init_icons() {
-  [[ $+_p9k__icon_mode == 1 && $_p9k__icon_mode == $POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING ]] && return
-  typeset -g _p9k__icon_mode=$POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING
+  [[ -n ${POWERLEVEL9K_MODE-} || ${langinfo[CODESET]} == (utf|UTF)(-|)8 ]] || local POWERLEVEL9K_MODE=ascii
+  [[ $_p9k__icon_mode == $POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING/$POWERLEVEL9K_ICON_PADDING ]] && return
+  typeset -g _p9k__icon_mode=$POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING/$POWERLEVEL9K_ICON_PADDING
 
   if [[ $POWERLEVEL9K_LEGACY_ICON_SPACING == true ]]; then
     local s=
@@ -51,6 +52,7 @@ function _p9k_init_icons() {
         LINUX_DEBIAN_ICON              '\uE271'$s             # 
         LINUX_RASPBIAN_ICON            '\uE271'$s             # 
         LINUX_UBUNTU_ICON              '\uE271'$s             # 
+        LINUX_KALI_ICON                '\uE271'$s             # 
         LINUX_CENTOS_ICON              '\uE271'$s             # 
         LINUX_COREOS_ICON              '\uE271'$s             # 
         LINUX_ELEMENTARY_ICON          '\uE271'$s             # 
@@ -67,6 +69,14 @@ function _p9k_init_icons() {
         LINUX_SABAYON_ICON             '\uE271'$s             # 
         LINUX_SLACKWARE_ICON           '\uE271'$s             # 
         LINUX_VOID_ICON                '\uE271'$s             # 
+        LINUX_ARTIX_ICON               '\uE271'$s             # 
+        LINUX_RHEL_ICON                '\uE271'$s             # 
+        LINUX_AMZN_ICON                '\uE271'$s             # 
+        LINUX_ENDEAVOUROS_ICON         '\uE271'$s             # 
+        LINUX_ROCKY_ICON               '\uE271'$s             # 
+        LINUX_ALMALINUX_ICON           '\uE271'$s             # 
+        LINUX_GUIX_ICON                '\uE271'$s             # 
+        LINUX_NEON_ICON                '\uE271'$s             # 
         SUNOS_ICON                     '\U1F31E'$q            # 🌞
         HOME_ICON                      '\uE12C'$s             # 
         HOME_SUB_ICON                  '\uE18D'$s             # 
@@ -97,14 +107,29 @@ function _p9k_init_icons() {
         VCS_GIT_GITHUB_ICON            '\uE20E '              #
         VCS_GIT_BITBUCKET_ICON         '\uE20E '              #
         VCS_GIT_GITLAB_ICON            '\uE20E '              #
+        VCS_GIT_AZURE_ICON             '\uE20E '              #
+        VCS_GIT_ARCHLINUX_ICON         '\uE20E '              #
+        VCS_GIT_CODEBERG_ICON          '\uE20E '              #
+        VCS_GIT_DEBIAN_ICON            '\uE20E '              #
+        VCS_GIT_FREEBSD_ICON           '\uE20E '              #
+        VCS_GIT_FREEDESKTOP_ICON       '\uE20E '              #
+        VCS_GIT_GNOME_ICON             '\uE20E '              #
+        VCS_GIT_GNU_ICON               '\uE20E '              #
+        VCS_GIT_KDE_ICON               '\uE20E '              #
+        VCS_GIT_LINUX_ICON             '\uE20E '              #
+        VCS_GIT_GITEA_ICON             '\uE20E '              #
+        VCS_GIT_SOURCEHUT_ICON         '\uE20E '              #
         VCS_HG_ICON                    '\uE1C3 '              # 
         VCS_SVN_ICON                   'svn'$q
         RUST_ICON                      'R'
         PYTHON_ICON                    '\uE63C'$s             #  (doesn't always work)
+        CHEZMOI_ICON                   '\uE12C'$s             # 
         SWIFT_ICON                     'Swift'
         GO_ICON                        'Go'
+        GOLANG_ICON                    'Go'
         PUBLIC_IP_ICON                 'IP'
         LOCK_ICON                      '\UE138'               # 
+        NORDVPN_ICON                   '\UE138'               # 
         EXECUTION_TIME_ICON            '\UE89C'$s             # 
         SSH_ICON                       'ssh'
         VPN_ICON                       '\UE138'
@@ -115,10 +140,11 @@ function _p9k_init_icons() {
         JAVA_ICON                      '\U2615'               # ☕︎
         LARAVEL_ICON                   ''
         RANGER_ICON                    '\u2B50'               # ⭐
+        YAZI_ICON                      '\u2B50'               # ⭐
         MIDNIGHT_COMMANDER_ICON        'mc'
         VIM_ICON                       'vim'
         TERRAFORM_ICON                 'tf'
-        PROXY_ICON                     '\u2B82'               # ⮂
+        PROXY_ICON                     '\u2194'               # ↔
         DOTNET_ICON                    '.NET'
         DOTNET_CORE_ICON               '.NET'
         AZURE_ICON                     '\u2601'               # ☁
@@ -128,6 +154,8 @@ function _p9k_init_icons() {
         LUA_ICON                       'lua'
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
         TIMEWARRIOR_ICON               'tw'
         TASKWARRIOR_ICON               'task'
         NIX_SHELL_ICON                 'nix'
@@ -136,6 +164,13 @@ function _p9k_init_icons() {
         ELIXIR_ICON                    'elixir'
         POSTGRES_ICON                  'postgres'
         PHP_ICON                       'php'
+        HASKELL_ICON                   'hs'
+        PACKAGE_ICON                   'pkg'
+        JULIA_ICON                     'jl'
+        SCALA_ICON                     'scala'
+        TOOLBOX_ICON                   '\u2B22'               # ⬢
+        ARCH_ICON                      'arch'
+        HISTORY_ICON                   'hist'
       )
     ;;
     'awesome-fontconfig')
@@ -176,6 +211,7 @@ function _p9k_init_icons() {
         LINUX_DEBIAN_ICON              '\uF17C'$s             # 
         LINUX_RASPBIAN_ICON            '\uF17C'$s             # 
         LINUX_UBUNTU_ICON              '\uF17C'$s             # 
+        LINUX_KALI_ICON                '\uF17C'$s             # 
         LINUX_CENTOS_ICON              '\uF17C'$s             # 
         LINUX_COREOS_ICON              '\uF17C'$s             # 
         LINUX_ELEMENTARY_ICON          '\uF17C'$s             # 
@@ -192,6 +228,14 @@ function _p9k_init_icons() {
         LINUX_SABAYON_ICON             '\uF17C'$s             # 
         LINUX_SLACKWARE_ICON           '\uF17C'$s             # 
         LINUX_VOID_ICON                '\uF17C'$s             # 
+        LINUX_ARTIX_ICON               '\uF17C'$s             # 
+        LINUX_RHEL_ICON                '\uF17C'$s             # 
+        LINUX_AMZN_ICON                '\uF17C'$s             # 
+        LINUX_ENDEAVOUROS_ICON         '\uF17C'$s             # 
+        LINUX_ROCKY_ICON               '\uF17C'$s             # 
+        LINUX_ALMALINUX_ICON           '\uF17C'$s             # 
+        LINUX_GUIX_ICON                '\uF17C'$s             # 
+        LINUX_NEON_ICON                '\uF17C'$s             # 
         SUNOS_ICON                     '\uF185 '              # 
         HOME_ICON                      '\uF015'$s             # 
         HOME_SUB_ICON                  '\uF07C'$s             # 
@@ -218,17 +262,32 @@ function _p9k_init_icons() {
         VCS_GIT_GITHUB_ICON            '\uF113 '              # 
         VCS_GIT_BITBUCKET_ICON         '\uF171 '              # 
         VCS_GIT_GITLAB_ICON            '\uF296 '              # 
+        VCS_GIT_AZURE_ICON             '\u2601 '              # ☁
+        VCS_GIT_ARCHLINUX_ICON         '\uF1D3 '              # 
+        VCS_GIT_CODEBERG_ICON          '\uF1D3 '              # 
+        VCS_GIT_DEBIAN_ICON            '\uF1D3 '              # 
+        VCS_GIT_FREEBSD_ICON           '\uF1D3 '              # 
+        VCS_GIT_FREEDESKTOP_ICON       '\uF1D3 '              # 
+        VCS_GIT_GNOME_ICON             '\uF1D3 '              # 
+        VCS_GIT_GNU_ICON               '\uF1D3 '              # 
+        VCS_GIT_KDE_ICON               '\uF1D3 '              # 
+        VCS_GIT_LINUX_ICON             '\uF1D3 '              # 
+        VCS_GIT_GITEA_ICON             '\uF1D3 '              # 
+        VCS_GIT_SOURCEHUT_ICON         '\uF1D3 '              # 
         VCS_HG_ICON                    '\uF0C3 '              # 
         VCS_SVN_ICON                   'svn'$q
         RUST_ICON                      '\uE6A8'               # 
         PYTHON_ICON                    '\uE63C'$s             # 
+        CHEZMOI_ICON                   '\uF015'$s             # 
         SWIFT_ICON                     'Swift'
         GO_ICON                        'Go'
+        GOLANG_ICON                    'Go'
         PUBLIC_IP_ICON                 'IP'
         LOCK_ICON                      '\UF023'               # 
+        NORDVPN_ICON                   '\UF023'               # 
         EXECUTION_TIME_ICON            '\uF253'$s             # 
         SSH_ICON                       'ssh'
-        VPN_ICON                       '\uF023' 
+        VPN_ICON                       '\uF023'
         KUBERNETES_ICON                '\U2388'               # ⎈
         DROPBOX_ICON                   '\UF16B'$s             # 
         DATE_ICON                      '\uF073 '              # 
@@ -236,10 +295,11 @@ function _p9k_init_icons() {
         JAVA_ICON                      '\U2615'               # ☕︎
         LARAVEL_ICON                   ''
         RANGER_ICON                    '\u2B50'               # ⭐
+        YAZI_ICON                      '\u2B50'               # ⭐
         MIDNIGHT_COMMANDER_ICON        'mc'
         VIM_ICON                       'vim'
         TERRAFORM_ICON                 'tf'
-        PROXY_ICON                     '\u2B82'               # ⮂
+        PROXY_ICON                     '\u2194'               # ↔
         DOTNET_ICON                    '.NET'
         DOTNET_CORE_ICON               '.NET'
         AZURE_ICON                     '\u2601'               # ☁
@@ -249,6 +309,8 @@ function _p9k_init_icons() {
         LUA_ICON                       'lua'
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
         TIMEWARRIOR_ICON               'tw'
         TASKWARRIOR_ICON               'task'
         NIX_SHELL_ICON                 'nix'
@@ -257,6 +319,13 @@ function _p9k_init_icons() {
         ELIXIR_ICON                    'elixir'
         POSTGRES_ICON                  'postgres'
         PHP_ICON                       'php'
+        HASKELL_ICON                   'hs'
+        PACKAGE_ICON                   'pkg'
+        JULIA_ICON                     'jl'
+        SCALA_ICON                     'scala'
+        TOOLBOX_ICON                   '\u2B22'               # ⬢
+        ARCH_ICON                      'arch'
+        HISTORY_ICON                   'hist'
       )
     ;;
     'awesome-mapped-fontconfig')
@@ -302,6 +371,7 @@ function _p9k_init_icons() {
         LINUX_DEBIAN_ICON              "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_RASPBIAN_ICON            "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_UBUNTU_ICON              "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_KALI_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_CENTOS_ICON              "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_COREOS_ICON              "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_ELEMENTARY_ICON          "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
@@ -318,6 +388,14 @@ function _p9k_init_icons() {
         LINUX_SABAYON_ICON             "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_SLACKWARE_ICON           "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         LINUX_VOID_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_ARTIX_ICON               "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_RHEL_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_AMZN_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_ENDEAVOUROS_ICON         "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_ROCKY_ICON               "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_ALMALINUX_ICON           "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_GUIX_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
+        LINUX_NEON_ICON                "${CODEPOINT_OF_AWESOME_LINUX:+\\u$CODEPOINT_OF_AWESOME_LINUX$s}"
         SUNOS_ICON                     "${CODEPOINT_OF_AWESOME_SUN_O:+\\u$CODEPOINT_OF_AWESOME_SUN_O }"
         HOME_ICON                      "${CODEPOINT_OF_AWESOME_HOME:+\\u$CODEPOINT_OF_AWESOME_HOME$s}"
         HOME_SUB_ICON                  "${CODEPOINT_OF_AWESOME_FOLDER_OPEN:+\\u$CODEPOINT_OF_AWESOME_FOLDER_OPEN$s}"
@@ -344,13 +422,27 @@ function _p9k_init_icons() {
         VCS_GIT_GITHUB_ICON            "${CODEPOINT_OF_AWESOME_GITHUB_ALT:+\\u$CODEPOINT_OF_AWESOME_GITHUB_ALT }"
         VCS_GIT_BITBUCKET_ICON         "${CODEPOINT_OF_AWESOME_BITBUCKET:+\\u$CODEPOINT_OF_AWESOME_BITBUCKET }"
         VCS_GIT_GITLAB_ICON            "${CODEPOINT_OF_AWESOME_GITLAB:+\\u$CODEPOINT_OF_AWESOME_GITLAB }"
+        VCS_GIT_AZURE_ICON             '\u2601 '                                      # ☁
+        VCS_GIT_ARCHLINUX_ICON         "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_CODEBERG_ICON          "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_DEBIAN_ICON            "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_FREEBSD_ICON           "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_FREEDESKTOP_ICON       "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_GNOME_ICON             "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_GNU_ICON               "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_KDE_ICON               "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_LINUX_ICON             "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_GITEA_ICON             "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
+        VCS_GIT_SOURCEHUT_ICON         "${CODEPOINT_OF_AWESOME_GIT:+\\u$CODEPOINT_OF_AWESOME_GIT }"
         VCS_HG_ICON                    "${CODEPOINT_OF_AWESOME_FLASK:+\\u$CODEPOINT_OF_AWESOME_FLASK }"
         VCS_SVN_ICON                   'svn'$q
         RUST_ICON                      '\uE6A8'                                       # 
         PYTHON_ICON                    '\U1F40D'                                      # 🐍
+        CHEZMOI_ICON                    "${CODEPOINT_OF_AWESOME_HOME:+\\u$CODEPOINT_OF_AWESOME_HOME$s}"
         SWIFT_ICON                     '\uE655'$s                                     # 
         PUBLIC_IP_ICON                 "${CODEPOINT_OF_AWESOME_GLOBE:+\\u$CODEPOINT_OF_AWESOME_GLOBE$s}"
         LOCK_ICON                      "${CODEPOINT_OF_AWESOME_LOCK:+\\u$CODEPOINT_OF_AWESOME_LOCK}"
+        NORDVPN_ICON                   "${CODEPOINT_OF_AWESOME_LOCK:+\\u$CODEPOINT_OF_AWESOME_LOCK}"
         EXECUTION_TIME_ICON            "${CODEPOINT_OF_AWESOME_HOURGLASS_END:+\\u$CODEPOINT_OF_AWESOME_HOURGLASS_END$s}"
         SSH_ICON                       'ssh'
         VPN_ICON                       "${CODEPOINT_OF_AWESOME_LOCK:+\\u$CODEPOINT_OF_AWESOME_LOCK}"
@@ -361,10 +453,11 @@ function _p9k_init_icons() {
         JAVA_ICON                      '\U2615'                                       # ☕︎
         LARAVEL_ICON                   ''
         RANGER_ICON                    '\u2B50'                                       # ⭐
+        YAZI_ICON                      '\u2B50'                                       # ⭐
         MIDNIGHT_COMMANDER_ICON        'mc'
         VIM_ICON                       'vim'
         TERRAFORM_ICON                 'tf'
-        PROXY_ICON                     '\u2B82'                                       # ⮂
+        PROXY_ICON                     '\u2194'                                       # ↔
         DOTNET_ICON                    '.NET'
         DOTNET_CORE_ICON               '.NET'
         AZURE_ICON                     '\u2601'                                       # ☁
@@ -374,6 +467,8 @@ function _p9k_init_icons() {
         LUA_ICON                       'lua'
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
         TIMEWARRIOR_ICON               'tw'
         TASKWARRIOR_ICON               'task'
         NIX_SHELL_ICON                 'nix'
@@ -382,6 +477,174 @@ function _p9k_init_icons() {
         ELIXIR_ICON                    'elixir'
         POSTGRES_ICON                  'postgres'
         PHP_ICON                       'php'
+        HASKELL_ICON                   'hs'
+        PACKAGE_ICON                   'pkg'
+        JULIA_ICON                     'jl'
+        SCALA_ICON                     'scala'
+        TOOLBOX_ICON                   '\u2B22'                                       # ⬢
+        ARCH_ICON                      'arch'
+        HISTORY_ICON                   'hist'
+      )
+    ;;
+    'nerdfont-v3')
+      # In this version of Nerd Fonts the Material icons are mapped to U+F0001-U+F19C3.
+      # The font may also have Material icons in the old range of U+F500-U+FD46 but
+      # powerlevel10k won't rely on them.
+      icons=(
+        RULER_CHAR                     '\u2500'               # ─
+        LEFT_SEGMENT_SEPARATOR         '\uE0B0'               # 
+        RIGHT_SEGMENT_SEPARATOR        '\uE0B2'               # 
+        LEFT_SEGMENT_END_SEPARATOR     ' '                    #
+        LEFT_SUBSEGMENT_SEPARATOR      '\uE0B1'               # 
+        RIGHT_SUBSEGMENT_SEPARATOR     '\uE0B3'               # 
+        CARRIAGE_RETURN_ICON           '\u21B5'               # ↵
+        ROOT_ICON                      '\uE614'$q             # 
+        SUDO_ICON                      '\uF09C'$s             # 
+        RUBY_ICON                      '\uF219 '              # 
+        AWS_ICON                       '\uF270'$s             # 
+        AWS_EB_ICON                    '\UF1BD'$q$q           # 
+        BACKGROUND_JOBS_ICON           '\uF013 '              # 
+        TEST_ICON                      '\uF188'$s             # 
+        TODO_ICON                      '\u2611'               # ☑
+        BATTERY_ICON                   '\UF240 '              # 
+        DISK_ICON                      '\uF0A0'$s             # 
+        OK_ICON                        '\uF00C'$s             # 
+        FAIL_ICON                      '\uF00D'               # 
+        SYMFONY_ICON                   '\uE757'               # 
+        NODE_ICON                      '\uE617 '              # 
+        NODEJS_ICON                    '\uE617 '              # 
+        MULTILINE_FIRST_PROMPT_PREFIX  '\u256D\U2500'         # ╭─
+        MULTILINE_NEWLINE_PROMPT_PREFIX '\u251C\U2500'        # ├─
+        MULTILINE_LAST_PROMPT_PREFIX   '\u2570\U2500 '        # ╰─
+        APPLE_ICON                     '\uF179'               # 
+        WINDOWS_ICON                   '\uF17A'$s             # 
+        FREEBSD_ICON                   '\UF30C '              # 
+        ANDROID_ICON                   '\uF17B'               # 
+        LINUX_ARCH_ICON                '\uF303'               # 
+        LINUX_CENTOS_ICON              '\uF304'$s             # 
+        LINUX_COREOS_ICON              '\uF305'$s             # 
+        LINUX_DEBIAN_ICON              '\uF306'               # 
+        LINUX_RASPBIAN_ICON            '\uF315'               # 
+        LINUX_ELEMENTARY_ICON          '\uF309'$s             # 
+        LINUX_FEDORA_ICON              '\uF30a'$s             # 
+        LINUX_GENTOO_ICON              '\uF30d'$s             # 
+        LINUX_MAGEIA_ICON              '\uF310'               # 
+        LINUX_MINT_ICON                '\uF30e'$s             # 
+        LINUX_NIXOS_ICON               '\uF313'$s             # 
+        LINUX_MANJARO_ICON             '\uF312'$s             # 
+        LINUX_DEVUAN_ICON              '\uF307'$s             # 
+        LINUX_ALPINE_ICON              '\uF300'$s             # 
+        LINUX_AOSC_ICON                '\uF301'$s             # 
+        LINUX_OPENSUSE_ICON            '\uF314'$s             # 
+        LINUX_SABAYON_ICON             '\uF317'$s             # 
+        LINUX_SLACKWARE_ICON           '\uF319'$s             # 
+        LINUX_VOID_ICON                '\UF32E'$s             # 
+        LINUX_ARTIX_ICON               '\UF31F'$s             # 
+        LINUX_UBUNTU_ICON              '\uF31b'$s             # 
+        LINUX_KALI_ICON                '\uF327'$s             # 
+        LINUX_RHEL_ICON                '\UF111B'$s            # 󱄛
+        LINUX_AMZN_ICON                '\uF270'$s             # 
+        LINUX_ENDEAVOUROS_ICON         '\UF322'$s             # 
+        LINUX_ROCKY_ICON               '\UF32B'$s             # 
+        LINUX_ALMALINUX_ICON           '\UF31D'$s             # 
+        LINUX_GUIX_ICON                '\UF325'$s             # 
+        LINUX_NEON_ICON                '\uF17C'               # 
+        LINUX_ICON                     '\uF17C'               # 
+        SUNOS_ICON                     '\uF185 '              # 
+        HOME_ICON                      '\uF015'$s             # 
+        HOME_SUB_ICON                  '\uF07C'$s             # 
+        FOLDER_ICON                    '\uF115'$s             # 
+        ETC_ICON                       '\uF013'$s             # 
+        NETWORK_ICON                   '\UF0378'$s            # 󰍸
+        LOAD_ICON                      '\uF080 '              # 
+        SWAP_ICON                      '\uF464'$s             # 
+        RAM_ICON                       '\uF0E4'$s             # 
+        SERVER_ICON                    '\uF0AE'$s             # 
+        VCS_UNTRACKED_ICON             '\uF059'$s             # 
+        VCS_UNSTAGED_ICON              '\uF06A'$s             # 
+        VCS_STAGED_ICON                '\uF055'$s             # 
+        VCS_STASH_ICON                 '\uF01C '              # 
+        VCS_INCOMING_CHANGES_ICON      '\uF01A '              # 
+        VCS_OUTGOING_CHANGES_ICON      '\uF01B '              # 
+        VCS_TAG_ICON                   '\uF02B '              # 
+        VCS_BOOKMARK_ICON              '\uF461 '              # 
+        VCS_COMMIT_ICON                '\uE729 '              # 
+        VCS_BRANCH_ICON                '\uF126 '              # 
+        VCS_REMOTE_BRANCH_ICON         '\uE728 '              # 
+        VCS_LOADING_ICON               ''                     #
+        VCS_GIT_ICON                   '\uF1D3 '              # 
+        VCS_GIT_GITHUB_ICON            '\uF113 '              # 
+        VCS_GIT_BITBUCKET_ICON         '\uE703 '              # 
+        VCS_GIT_GITLAB_ICON            '\uF296 '              # 
+        VCS_GIT_AZURE_ICON             '\uEBE8 '              # 
+        VCS_GIT_ARCHLINUX_ICON         '\uF303 '              # 
+        # v3.1 has \uF330.
+        VCS_GIT_CODEBERG_ICON          '\uF1D3 '              # 
+        VCS_GIT_DEBIAN_ICON            '\uF306 '              # 
+        VCS_GIT_FREEBSD_ICON           '\UF30C '              # 
+        # v3.1 has \uF360.
+        VCS_GIT_FREEDESKTOP_ICON       '\uF296 '              # 
+        # v3.1 has \uF361.
+        VCS_GIT_GNOME_ICON             '\uF296 '              # 
+        VCS_GIT_GNU_ICON               '\uE779 '              # 
+        # v3.1 has \uF332.
+        VCS_GIT_KDE_ICON               '\uF296 '              # 
+        VCS_GIT_LINUX_ICON             '\uF17C '              # 
+        # v3.1 has \uF339.
+        VCS_GIT_GITEA_ICON             '\uF1D3 '              # 
+        VCS_GIT_SOURCEHUT_ICON         '\uF1DB '              # 
+        VCS_HG_ICON                    '\uF0C3 '              # 
+        VCS_SVN_ICON                   '\uE72D'$q             # 
+        RUST_ICON                      '\uE7A8'$q             # 
+        PYTHON_ICON                    '\UE73C '              # 
+        CHEZMOI_ICON                   '\uF015'$s             # 
+        SWIFT_ICON                     '\uE755'               # 
+        GO_ICON                        '\uE626'               # 
+        GOLANG_ICON                    '\uE626'               # 
+        PUBLIC_IP_ICON                 '\UF0AC'$s             # 
+        LOCK_ICON                      '\UF023'               # 
+        NORDVPN_ICON                   '\UF023'               # 
+        EXECUTION_TIME_ICON            '\uF252'$s             # 
+        SSH_ICON                       '\uF489'$s             # 
+        VPN_ICON                       '\UF023'               # 
+        KUBERNETES_ICON                '\UF10FE'              # 󱃾
+        DROPBOX_ICON                   '\UF16B'$s             # 
+        DATE_ICON                      '\uF073 '              # 
+        TIME_ICON                      '\uF017 '              # 
+        JAVA_ICON                      '\uE738'               # 
+        LARAVEL_ICON                   '\ue73f'$q             # 
+        RANGER_ICON                    '\uF00b '              # 
+        YAZI_ICON                      '\uF00b '              # 
+        MIDNIGHT_COMMANDER_ICON        'mc'                   # mc
+        VIM_ICON                       '\uE62B'               # 
+        TERRAFORM_ICON                 '\uF1BB '              # 
+        PROXY_ICON                     '\u2194'               # ↔
+        DOTNET_ICON                    '\uE77F'               # 
+        DOTNET_CORE_ICON               '\uE77F'               # 
+        AZURE_ICON                     '\uEBD8 '              # 
+        DIRENV_ICON                    '\u25BC'               # ▼
+        FLUTTER_ICON                   'F'                    # F
+        GCLOUD_ICON                    '\UF02AD'              # 󰊭
+        LUA_ICON                       '\uE620'               # 
+        PERL_ICON                      '\uE769'               # 
+        NNN_ICON                       'nnn'                  # nnn
+        LF_ICON                        'lf'                   # lf
+        XPLR_ICON                      'xplr'                 # xplr
+        TIMEWARRIOR_ICON               '\uF49B'               # 
+        TASKWARRIOR_ICON               '\uF4A0 '              # 
+        NIX_SHELL_ICON                 '\uF313 '              # 
+        WIFI_ICON                      '\uF1EB '              # 
+        ERLANG_ICON                    '\uE7B1 '              # 
+        ELIXIR_ICON                    '\uE62D'               # 
+        POSTGRES_ICON                  '\uE76E'               # 
+        PHP_ICON                       '\uE608'               # 
+        HASKELL_ICON                   '\uE61F'               # 
+        PACKAGE_ICON                   '\UF03D7'              # 󰏗
+        JULIA_ICON                     '\uE624'               # 
+        SCALA_ICON                     '\uE737'               # 
+        TOOLBOX_ICON                   '\uE20F'$s             # 
+        ARCH_ICON                      '\uE266'               # 
+        HISTORY_ICON                   '\uF1DA'$s             # 
       )
     ;;
     'nerdfont-complete'|'nerdfont-fontconfig')
@@ -437,14 +700,23 @@ function _p9k_init_icons() {
         LINUX_SABAYON_ICON             '\uF317'$s             # 
         LINUX_SLACKWARE_ICON           '\uF319'$s             # 
         LINUX_VOID_ICON                '\uF17C'               # 
+        LINUX_ARTIX_ICON               '\uF17C'               # 
         LINUX_UBUNTU_ICON              '\uF31b'$s             # 
+        LINUX_KALI_ICON                '\uF17C'               # 
+        LINUX_RHEL_ICON                '\uF316'$s             # 
+        LINUX_AMZN_ICON                '\uF270'$s             # 
+        LINUX_ENDEAVOUROS_ICON         '\uF17C'               # 
+        LINUX_ROCKY_ICON               '\uF17C'               # 
+        LINUX_ALMALINUX_ICON           '\uF17C'               # 
+        LINUX_GUIX_ICON                '\uF325'$s             # 
+        LINUX_NEON_ICON                '\uF17C'               # 
         LINUX_ICON                     '\uF17C'               # 
         SUNOS_ICON                     '\uF185 '              # 
         HOME_ICON                      '\uF015'$s             # 
         HOME_SUB_ICON                  '\uF07C'$s             # 
         FOLDER_ICON                    '\uF115'$s             # 
         ETC_ICON                       '\uF013'$s             # 
-        NETWORK_ICON                   '\uFBF1'$s             # ﯱ
+        NETWORK_ICON                   '\uF50D'$s             # 
         LOAD_ICON                      '\uF080 '              # 
         SWAP_ICON                      '\uF464'$s             # 
         RAM_ICON                       '\uF0E4'$s             # 
@@ -465,14 +737,29 @@ function _p9k_init_icons() {
         VCS_GIT_GITHUB_ICON            '\uF113 '              # 
         VCS_GIT_BITBUCKET_ICON         '\uE703 '              # 
         VCS_GIT_GITLAB_ICON            '\uF296 '              # 
+        VCS_GIT_AZURE_ICON             '\uFD03 '              # ﴃ
+        VCS_GIT_ARCHLINUX_ICON         '\uF303 '              # 
+        VCS_GIT_CODEBERG_ICON          '\uF1D3 '              # 
+        VCS_GIT_DEBIAN_ICON            '\uF306 '              # 
+        VCS_GIT_FREEBSD_ICON           '\UF30C '              # 
+        VCS_GIT_FREEDESKTOP_ICON       '\uF296 '              # 
+        VCS_GIT_GNOME_ICON             '\uF296 '              # 
+        VCS_GIT_GNU_ICON               '\uE779 '              # 
+        VCS_GIT_KDE_ICON               '\uF296 '              # 
+        VCS_GIT_LINUX_ICON             '\uF17C '              # 
+        VCS_GIT_GITEA_ICON             '\uF1D3 '              # 
+        VCS_GIT_SOURCEHUT_ICON         '\uF1DB '              # 
         VCS_HG_ICON                    '\uF0C3 '              # 
         VCS_SVN_ICON                   '\uE72D'$q             # 
         RUST_ICON                      '\uE7A8'$q             # 
         PYTHON_ICON                    '\UE73C '              # 
+        CHEZMOI_ICON                   '\uF015'$s             # 
         SWIFT_ICON                     '\uE755'               # 
         GO_ICON                        '\uE626'               # 
+        GOLANG_ICON                    '\uE626'               # 
         PUBLIC_IP_ICON                 '\UF0AC'$s             # 
         LOCK_ICON                      '\UF023'               # 
+        NORDVPN_ICON                   '\UF023'               # 
         EXECUTION_TIME_ICON            '\uF252'$s             # 
         SSH_ICON                       '\uF489'$s             # 
         VPN_ICON                       '\UF023'
@@ -483,10 +770,11 @@ function _p9k_init_icons() {
         JAVA_ICON                      '\uE738'               # 
         LARAVEL_ICON                   '\ue73f'$q             # 
         RANGER_ICON                    '\uF00b '              # 
+        YAZI_ICON                      '\uF00b '              # 
         MIDNIGHT_COMMANDER_ICON        'mc'
         VIM_ICON                       '\uE62B'               # 
         TERRAFORM_ICON                 '\uF1BB '              # 
-        PROXY_ICON                     '\u2B82'               # ⮂
+        PROXY_ICON                     '\u2194'               # ↔
         DOTNET_ICON                    '\uE77F'               # 
         DOTNET_CORE_ICON               '\uE77F'               # 
         AZURE_ICON                     '\uFD03'               # ﴃ
@@ -496,6 +784,8 @@ function _p9k_init_icons() {
         LUA_ICON                       '\uE620'               # 
         PERL_ICON                      '\uE769'               # 
         NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
         TIMEWARRIOR_ICON               '\uF49B'               # 
         TASKWARRIOR_ICON               '\uF4A0 '              # 
         NIX_SHELL_ICON                 '\uF313 '              # 
@@ -504,6 +794,166 @@ function _p9k_init_icons() {
         ELIXIR_ICON                    '\uE62D'               # 
         POSTGRES_ICON                  '\uE76E'               # 
         PHP_ICON                       '\uE608'               # 
+        HASKELL_ICON                   '\uE61F'               # 
+        PACKAGE_ICON                   '\uF8D6'               # 
+        JULIA_ICON                     '\uE624'               # 
+        SCALA_ICON                     '\uE737'               # 
+        TOOLBOX_ICON                   '\uE20F'$s             # 
+        ARCH_ICON                      '\uE266'               # 
+        HISTORY_ICON                   '\uF1DA'$s             # 
+      )
+    ;;
+    ascii)
+      icons=(
+        RULER_CHAR                     '-'
+        LEFT_SEGMENT_SEPARATOR         ''
+        RIGHT_SEGMENT_SEPARATOR        ''
+        LEFT_SEGMENT_END_SEPARATOR     ' '
+        LEFT_SUBSEGMENT_SEPARATOR      '|'
+        RIGHT_SUBSEGMENT_SEPARATOR     '|'
+        CARRIAGE_RETURN_ICON           ''
+        ROOT_ICON                      '#'
+        SUDO_ICON                      ''
+        RUBY_ICON                      'rb'
+        AWS_ICON                       'aws'
+        AWS_EB_ICON                    'eb'
+        BACKGROUND_JOBS_ICON           '%%'
+        TEST_ICON                      ''
+        TODO_ICON                      'todo'
+        BATTERY_ICON                   'battery'
+        DISK_ICON                      'disk'
+        OK_ICON                        'ok'
+        FAIL_ICON                      'err'
+        SYMFONY_ICON                   'symphony'
+        NODE_ICON                      'node'
+        NODEJS_ICON                    'node'
+        MULTILINE_FIRST_PROMPT_PREFIX  ''
+        MULTILINE_NEWLINE_PROMPT_PREFIX ''
+        MULTILINE_LAST_PROMPT_PREFIX   ''
+        APPLE_ICON                     'mac'
+        WINDOWS_ICON                   'win'
+        FREEBSD_ICON                   'bsd'
+        ANDROID_ICON                   'android'
+        LINUX_ICON                     'linux'
+        LINUX_ARCH_ICON                'arch'
+        LINUX_DEBIAN_ICON              'debian'
+        LINUX_RASPBIAN_ICON            'pi'
+        LINUX_UBUNTU_ICON              'ubuntu'
+        LINUX_KALI_ICON                'kali'
+        LINUX_CENTOS_ICON              'centos'
+        LINUX_COREOS_ICON              'coreos'
+        LINUX_ELEMENTARY_ICON          'elementary'
+        LINUX_MINT_ICON                'mint'
+        LINUX_FEDORA_ICON              'fedora'
+        LINUX_GENTOO_ICON              'gentoo'
+        LINUX_MAGEIA_ICON              'mageia'
+        LINUX_NIXOS_ICON               'nixos'
+        LINUX_MANJARO_ICON             'manjaro'
+        LINUX_DEVUAN_ICON              'devuan'
+        LINUX_ALPINE_ICON              'alpine'
+        LINUX_AOSC_ICON                'aosc'
+        LINUX_OPENSUSE_ICON            'suse'
+        LINUX_SABAYON_ICON             'sabayon'
+        LINUX_SLACKWARE_ICON           'slack'
+        LINUX_VOID_ICON                'void'
+        LINUX_ARTIX_ICON               'artix'
+        LINUX_RHEL_ICON                'rhel'
+        LINUX_AMZN_ICON                'amzn'
+        LINUX_ENDEAVOUROS_ICON         'edvos'
+        LINUX_ROCKY_ICON               'rocky'
+        LINUX_ALMALINUX_ICON           'alma'
+        LINUX_GUIX_ICON                'guix'
+        LINUX_NEON_ICON                'neon'
+        SUNOS_ICON                     'sunos'
+        HOME_ICON                      ''
+        HOME_SUB_ICON                  ''
+        FOLDER_ICON                    ''
+        ETC_ICON                       ''
+        NETWORK_ICON                   'ip'
+        LOAD_ICON                      'cpu'
+        SWAP_ICON                      'swap'
+        RAM_ICON                       'ram'
+        SERVER_ICON                    ''
+        VCS_UNTRACKED_ICON             '?'
+        VCS_UNSTAGED_ICON              '!'
+        VCS_STAGED_ICON                '+'
+        VCS_STASH_ICON                 '#'
+        VCS_INCOMING_CHANGES_ICON      '<'
+        VCS_OUTGOING_CHANGES_ICON      '>'
+        VCS_TAG_ICON                   ''
+        VCS_BOOKMARK_ICON              '^'
+        VCS_COMMIT_ICON                '@'
+        VCS_BRANCH_ICON                ''
+        VCS_REMOTE_BRANCH_ICON         ':'
+        VCS_LOADING_ICON               ''
+        VCS_GIT_ICON                   ''
+        VCS_GIT_GITHUB_ICON            ''
+        VCS_GIT_BITBUCKET_ICON         ''
+        VCS_GIT_GITLAB_ICON            ''
+        VCS_GIT_AZURE_ICON             ''
+        VCS_GIT_ARCHLINUX_ICON         ''
+        VCS_GIT_CODEBERG_ICON          ''
+        VCS_GIT_DEBIAN_ICON            ''
+        VCS_GIT_FREEBSD_ICON           ''
+        VCS_GIT_FREEDESKTOP_ICON       ''
+        VCS_GIT_GNOME_ICON             ''
+        VCS_GIT_GNU_ICON               ''
+        VCS_GIT_KDE_ICON               ''
+        VCS_GIT_LINUX_ICON             ''
+        VCS_GIT_GITEA_ICON             ''
+        VCS_GIT_SOURCEHUT_ICON         ''
+        VCS_HG_ICON                    ''
+        VCS_SVN_ICON                   ''
+        RUST_ICON                      'rust'
+        PYTHON_ICON                    'py'
+        CHEZMOI_ICON                   'chezmoi'
+        SWIFT_ICON                     'swift'
+        GO_ICON                        'go'
+        GOLANG_ICON                    'go'
+        PUBLIC_IP_ICON                 'ip'
+        LOCK_ICON                      '!w'
+        NORDVPN_ICON                   'nordvpn'
+        EXECUTION_TIME_ICON            ''
+        SSH_ICON                       'ssh'
+        VPN_ICON                       'vpn'
+        KUBERNETES_ICON                'kube'
+        DROPBOX_ICON                   'dropbox'
+        DATE_ICON                      ''
+        TIME_ICON                      ''
+        JAVA_ICON                      'java'
+        LARAVEL_ICON                   ''
+        RANGER_ICON                    'ranger'
+        YAZI_ICON                      'yazi'
+        MIDNIGHT_COMMANDER_ICON        'mc'
+        VIM_ICON                       'vim'
+        TERRAFORM_ICON                 'tf'
+        PROXY_ICON                     'proxy'
+        DOTNET_ICON                    '.net'
+        DOTNET_CORE_ICON               '.net'
+        AZURE_ICON                     'az'
+        DIRENV_ICON                    'direnv'
+        FLUTTER_ICON                   'flutter'
+        GCLOUD_ICON                    'gcloud'
+        LUA_ICON                       'lua'
+        PERL_ICON                      'perl'
+        NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
+        TIMEWARRIOR_ICON               'tw'
+        TASKWARRIOR_ICON               'task'
+        NIX_SHELL_ICON                 'nix'
+        WIFI_ICON                      'wifi'
+        ERLANG_ICON                    'erlang'
+        ELIXIR_ICON                    'elixir'
+        POSTGRES_ICON                  'postgres'
+        PHP_ICON                       'php'
+        HASKELL_ICON                   'hs'
+        PACKAGE_ICON                   'pkg'
+        JULIA_ICON                     'jl'
+        SCALA_ICON                     'scala'
+        TOOLBOX_ICON                   'toolbox'
+        ARCH_ICON                      'arch'
+        HISTORY_ICON                   'hist'
       )
     ;;
     *)
@@ -526,7 +976,7 @@ function _p9k_init_icons() {
         TEST_ICON                      ''
         TODO_ICON                      '\u2206'               # ∆
         BATTERY_ICON                   '\U1F50B'              # 🔋
-        DISK_ICON                      'hdd' 
+        DISK_ICON                      'hdd'
         OK_ICON                        '\u2714'               # ✔
         FAIL_ICON                      '\u2718'               # ✘
         SYMFONY_ICON                   'SF'
@@ -544,6 +994,7 @@ function _p9k_init_icons() {
         LINUX_DEBIAN_ICON              'Deb'
         LINUX_RASPBIAN_ICON            'RPi'
         LINUX_UBUNTU_ICON              'Ubu'
+        LINUX_KALI_ICON                'Kal'
         LINUX_CENTOS_ICON              'Cen'
         LINUX_COREOS_ICON              'Cor'
         LINUX_ELEMENTARY_ICON          'Elm'
@@ -560,6 +1011,14 @@ function _p9k_init_icons() {
         LINUX_SABAYON_ICON             'Sab'
         LINUX_SLACKWARE_ICON           'Sla'
         LINUX_VOID_ICON                'Vo'
+        LINUX_ARTIX_ICON               'Art'
+        LINUX_RHEL_ICON                'RH'
+        LINUX_AMZN_ICON                'Amzn'
+        LINUX_ENDEAVOUROS_ICON         'Edv'
+        LINUX_ROCKY_ICON               'Roc'
+        LINUX_ALMALINUX_ICON           'Alma'
+        LINUX_GUIX_ICON                'Guix'
+        LINUX_NEON_ICON                'Neon'
         SUNOS_ICON                     'Sun'
         HOME_ICON                      ''
         HOME_SUB_ICON                  ''
@@ -586,14 +1045,29 @@ function _p9k_init_icons() {
         VCS_GIT_GITHUB_ICON            ''
         VCS_GIT_BITBUCKET_ICON         ''
         VCS_GIT_GITLAB_ICON            ''
+        VCS_GIT_AZURE_ICON             ''
+        VCS_GIT_ARCHLINUX_ICON         ''
+        VCS_GIT_CODEBERG_ICON          ''
+        VCS_GIT_DEBIAN_ICON            ''
+        VCS_GIT_FREEBSD_ICON           ''
+        VCS_GIT_FREEDESKTOP_ICON       ''
+        VCS_GIT_GNOME_ICON             ''
+        VCS_GIT_GNU_ICON               ''
+        VCS_GIT_KDE_ICON               ''
+        VCS_GIT_LINUX_ICON             ''
+        VCS_GIT_GITEA_ICON             ''
+        VCS_GIT_SOURCEHUT_ICON         ''
         VCS_HG_ICON                    ''
         VCS_SVN_ICON                   ''
         RUST_ICON                      'R'
         PYTHON_ICON                    'Py'
+        CHEZMOI_ICON                   'Chez'
         SWIFT_ICON                     'Swift'
         GO_ICON                        'Go'
+        GOLANG_ICON                    'Go'
         PUBLIC_IP_ICON                 'IP'
-        LOCK_ICON                      '\UE0A2' 
+        LOCK_ICON                      '\UE0A2'
+        NORDVPN_ICON                   '\UE0A2'
         EXECUTION_TIME_ICON            ''
         SSH_ICON                       'ssh'
         VPN_ICON                       'vpn'
@@ -604,6 +1078,7 @@ function _p9k_init_icons() {
         JAVA_ICON                      '\U2615'               # ☕︎
         LARAVEL_ICON                   ''
         RANGER_ICON                    '\u2B50'               # ⭐
+        YAZI_ICON                      '\u2B50'               # ⭐
         MIDNIGHT_COMMANDER_ICON        'mc'
         VIM_ICON                       'vim'
         TERRAFORM_ICON                 'tf'
@@ -617,6 +1092,8 @@ function _p9k_init_icons() {
         LUA_ICON                       'lua'
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
+        LF_ICON                        'lf'
+        XPLR_ICON                      'xplr'
         TIMEWARRIOR_ICON               'tw'
         TASKWARRIOR_ICON               'task'
         NIX_SHELL_ICON                 'nix'
@@ -625,6 +1102,13 @@ function _p9k_init_icons() {
         ELIXIR_ICON                    'elixir'
         POSTGRES_ICON                  'postgres'
         PHP_ICON                       'php'
+        HASKELL_ICON                   'hs'
+        PACKAGE_ICON                   'pkg'
+        JULIA_ICON                     'jl'
+        SCALA_ICON                     'scala'
+        TOOLBOX_ICON                   '\u2B22'               # ⬢
+        ARCH_ICON                      'arch'
+        HISTORY_ICON                   'hist'
       )
     ;;
   esac
@@ -643,6 +1127,17 @@ function _p9k_init_icons() {
       icons[VCS_BRANCH_ICON]='@'
     ;;
   esac
+
+  if [[ $POWERLEVEL9K_ICON_PADDING == none && $POWERLEVEL9K_MODE != ascii ]]; then
+    icons=("${(@kv)icons%% #}")
+    icons[LEFT_SEGMENT_END_SEPARATOR]+=' '
+    icons[MULTILINE_LAST_PROMPT_PREFIX]+=' '
+    icons[VCS_TAG_ICON]+=' '
+    icons[VCS_BOOKMARK_ICON]+=' '
+    icons[VCS_COMMIT_ICON]+=' '
+    icons[VCS_BRANCH_ICON]+=' '
+    icons[VCS_REMOTE_BRANCH_ICON]+=' '
+  fi
 }
 
 # Sadly, this is a part of public API. Its use is emphatically discouraged.

internal/notes.md

@@ -0,0 +1,197 @@
+battery: use the same technique as in vpn_ip to avoid reset=2.
+
+---
+
+implement fake gitstatus api on top of vcs_info (or plain git?) + worker and use it if there is no
+gitstatus.
+
+---
+
+- call vcs_info on worker. the tricky question is what to display while "loading".
+
+---
+
+- add _SHOW_SYSTEM to all *env segments.
+
+---
+
+- support states in SHOW_ON_COMMAND: POWERLEVEL9K_SEGMENT_STATE_SHOW_ON_COMMAND='...'
+
+---
+
+add POWERLEVEL9K_${SEGMENT}_${STATE}_SHOW_IN_DIR='pwd_pattern'; implement the same way as
+SHOW_ON_UPGLOB. how should it interact with POWERLEVEL9K_${SEGMENT}_DISABLED_DIR_PATTERN?
+
+---
+
+add `p10k upglob`; returns 0 on match and sets REPLY to the directory where match was found.
+
+---
+
+when directory cannot be shortened any further, start chopping off segments from the left and
+replacing the chopped off part with `…`. e.g., `…/x/anchor/y/anchor`. the shortest dir
+representation is thus `…/last` or `…/last` depending on whether the last segment is an anchor.
+the replacement parameter's value is `…/` (with a slash) to allow for `x/anchor/y/anchor`.
+
+---
+
+- add to faq: how do i display an environment variable in prompt? link it from "extensible"
+
+---
+
+- add to faq: how do i display an icon in prompt? link it from "extensible"
+
+---
+
+- add root_indicator to config templates
+
+---
+
+- test chruby and add it to config templates
+
+---
+
+- add ssh to config templates
+
+---
+
+- add swift version to config templates; see if there is a good pattern for PROJECT_ONLY
+
+---
+
+- add swiftenv
+
+---
+
+- add faq: how to customize directory shortening? mention POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER,
+POWERLEVEL9K_DIR_MAX_LENGTH and co., and truncate_to_last.
+
+---
+
+fix a bug in zsh: https://github.com/romkatv/powerlevel10k/issues/502. to reproduce:
+
+```zsh
+emulate zsh -o prompt_percent -c 'print -P "%F{#ff0000}red%F{green}%B bold green"'
+```
+
+---
+
+add `p10k explain` that prints something like this:
+
+```text
+segment     icons meaning
+
+---
+
+---
+
+---
+
+---
+
+---
+
+---
+
+---
+
+---
+--
+status      ✔  ✘  exit code of the last command
+```
+
+implement it the hard way: for every enabled segment go over all its {state,icon} pairs, resolve
+the icon (if not absolute), apply VISUAL_IDENTIFIER_EXPANSION, remove leading and trailing
+whitespace and print without formatting (sort of like `print -P | cat`); print segment names in
+green and icons in bold; battery can have an unlimited number of icons, so `...` would be needed
+(based on total length of concatenated icons rather than the number of icons); user-defined
+segments would have "unknown" icons by default (yellow and not bold); can allow them to
+participate by defining `explainprompt_foo` that populates array `reply` with strings like this:
+'-s STATE -i LOCK_ICON +r'; the first element must be segment description.
+
+---
+
+add `docker_context` prompt segment; similar to `kubecontext`; the data should come from
+`currentContext` field in `~/.docker/config.json` (according to
+https://github.com/starship/starship/issues/995); there is also `DOCKER_CONTEXT`; more info:
+https://docs.docker.com/engine/reference/commandline/context_use; also
+https://github.com/starship/starship/pull/996.
+
+---
+
+support `env`, `ionice` and `strace` precommands in `parser.zsh`.
+
+---
+
+Add ruler to configuration wizard. Options: `─`, `·`, `╌`, `┄`, `▁`, `═`.
+
+---
+
+Add frame styles to the wizard.
+
+```text
+╭─
+╰─
+
+┌─
+└─
+
+┏━
+┗━
+
+╔═
+╚═
+
+▛▀
+▙▄
+```
+
+Prompt connection should have matching options.
+
+---
+
+Add `POWERLEVEL9K_{LEFT,RIGHT}_SEGMENT_MIRROR_SEPARATOR`. If set, left segments get separated with
+`POWERLEVEL9K_LEFT_SEGMENT_SEPARATOR` followed by `POWERLEVEL9K_LEFT_SEGMENT_MIRROR_SEPARATOR`.
+Each is drawn without background. The first with the foreground of left segment, the second with
+the background of right segment. To insert space in between, embed it in
+`POWERLEVEL9K_{LEFT,RIGHT}_SEGMENT_MIRROR_SEPARATOR`.
+`POWERLEVEL9K_{LEFT,RIGHT}_SUBSEGMENT_SEPARATOR` is unused.
+
+---
+
+Add *Segment Connection* screen to configuration wizard with options *Fused*, *Touching* and
+*Disjoint*. The last two differ by the absence/presence of space between `SEGMENT_SEPARATOR` and
+`SEGMENT_MIRROR_SEPARATOR`.
+
+*Fused* requires line separator (there is already a screen for it) but the other two options require
+two filled separators similar to heads and tail. Figure out how to present this choice.
+
+---
+
+Optimize auto-wizard check.
+
+```text
+time ( repeat 1000 [[ -z "${parameters[(I)POWERLEVEL9K_*~(POWERLEVEL9K_MODE|POWERLEVEL9K_CONFIG_FILE)]}" ]] )
+user=0.21s system=0.05s cpu=99% total=0.264
+
+time ( repeat 1000 [[ -z "${parameters[(I)POWERLEVEL9K_*]}" ]] )
+user=0.17s system=0.00s cpu=99% total=0.175
+```
+
+---
+
+Add the equivalent of `P9K_PYTHON_VERSION` to all `*env` segments where it makes sense.
+
+---
+
+Define `P9K_ICON` on initialization. Fill it with `$icon`. Duplicate every key that ends in `_ICON`.
+Respect `POWERLEVEL9K_VCS_STASH_ICON` overrides but not anything with segment name or state.
+
+Define `POWERLEVEL9K_VCS_*` parameters in config templates for all symbols used in
+`my_git_formatter`. Add missing entries to `icons`. Use `$P9K_ICON[...]` within `my_git_formatter`.
+Add a screen to the wizard to choose between clear and circled icons.
+
+---
+
+Add a screen to the wizard asking whether to set `POWERLEVEL9K_VCS_DISABLED_WORKDIR_PATTERN='~'`.
+Show it only if there is `$HOME/.git`. By default this parameter should be commented out.

internal/notes.txt

@@ -1,41 +0,0 @@
-- battery: when state or icon change, update with _p9k_set_prompt. make sure icons can be sent with
-  `typset -p` in zsh 5.1.
-- ram: reduce precision to 2 digits. check if it makes sense for all segments that use the same
-  function.
-- to avoid resetting prompt too often (e.g., when battery remaining time changes by 1 minute), can
-  do the following: send the current state from master to worker; worker sends new state if it's
-  different but it only triggers prompt reset if it's sufficiently different. this requires
-  disabling implicit reset on every eval in _p9k_worker_receive.
-- implement fake gitstatus api on top of vcs_info (or plain git?) + worker and use it if there is no
-  gitstatus.
-- add _SHOW_SYSTEM to all *env segments.
-- support states in SHOW_ON_COMMAND: POWERLEVEL9K_SEGMENT_STATE_SHOW_ON_COMMAND='...'
-- add POWERLEVEL9K_${SEGMENT}_${STATE}_SHOW_IN_DIR='pwd_pattern'; implement the same way as
-  SHOW_ON_UPGLOB.
-- add `p10k upglob`; returns 0 on match and sets REPLY to the directory where match was found.
-- when directory cannot be shortened any further, start chopping off segments from the left and
-  replacing the chopped off part with `…`. e.g., `…/x/anchor/y/anchor`. the shortest dir
-  representation is thus `…/last` or `…/last` depending on whether the last segment is an anchor.
-  the replacement parameter's value is `…/` (with a slash) to allow for `x/anchor/y/anchor`.
-- add to faq: how do i display an environment variable in prompt? link it from "extensible"
-- add to faq: how do i display an icon in prompt? link it from "extensible"
-- add root_indicator to config templates
-- test chruby and add it to config templates
-- add ssh to config templates
-- add swift version to config templates; see if there is a good pattern for PROJECT_ONLY
-- add swiftenv
-- add faq: how to customize directory shortening? mention POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER,
-  POWERLEVEL9K_DIR_MAX_LENGTH and co., and truncate_to_last.
-- fix a bug in zsh: https://github.com/romkatv/powerlevel10k/issues/502. to reproduce:
-    emulate zsh -o prompt_percent -c 'print -P "%F{#ff0000}red%F{green}%B bold green"'
-- bug: open a new tab and hit ctrl-p. an empty line will appear before prompt.
-- zsh-syntax-highlighting added two precommands: chronic and ifne.
-- use this in wizard: https://wiki.bash-hackers.org/snipplets/screen_saverestore
-- add POWERLEVEL9K_MODE=ascii
-- add ascii version of lean style (both color versions); hopefully without creating new files.
-- wizard: if the font seems very weak, add another question about ❯. if it's not visible, go ascii.
-- wizard: add flat heads and tails; display them if there is no powerline support. maybe even make
-  them the default.
-- take a look at https://github.com/skywind3000/z.lua. it claims to have fzf support. would be nice
-  if alt-down showed two groups -- one for subdirs and another for directory history (sorted by
-  frequency of use? by last use? three sections? more key bindings?).

internal/parser.zsh

@@ -54,6 +54,8 @@ typeset -grA __p9k_pb_precommand=(
   'sudo'      '-[^aghpuUCcrtT]#[aghpuUCcrtT]|--(close-from|group|host|prompt|role|type|other-user|command-timeout|user)'
   'ssh-agent' '-[^aEPt]#[aEPt]'
   'tabbed'    '-[^gnprtTuU]#[gnprtTuU]'
+  'chronic'   ''
+  'ifne'      ''
 )
 
 typeset -grA __p9k_pb_redirect=(
@@ -100,7 +102,7 @@ typeset -grA __p9k_pb_term_skip=(
 
 # Usage: _p9k_parse_buffer <buffer> [token-limit]
 #
-# Parses the specified command line buffer and pupulates array P9K_COMMANDS
+# Parses the specified command line buffer and populates array P9K_COMMANDS
 # with commands from it. Terminates early and returns 1 if there are more
 # tokens than the specified limit.
 #
@@ -150,7 +152,7 @@ function _p9k_parse_buffer() {
   local -r var="\$$id|\${$id}|\"\$$id\"|\"\${$id}\""
 
   local -i e ic c=${2:-'1 << 62'}
-  local skip n s r state cmd prev
+  local skip n s r state token cmd prev
   local -a aln alp alf v
 
   if [[ -o interactive_comments ]]; then
@@ -294,7 +296,7 @@ function _p9k_parse_buffer() {
         if [[ $token == $~var ]]; then
           n=${${token##[^[:IDENT:]]}%%[^[:IDENT:]]}
           [[ $token == *'"' ]] && v=("${(P)n}") || v=(${(P)n})
-          tokens[1,0]=(${(qq)v})
+          tokens[1,0]=(${(@qq)v})
           continue
         fi
       fi

internal/worker.zsh

@@ -89,12 +89,15 @@ function _p9k_worker_invoke() {
 }
 
 function _p9k_worker_cleanup() {
-  eval "$__p9k_intro"
+  # __p9k_intro bugs out here in some cases for some reason.
+  emulate -L zsh
   [[ $_p9k__worker_shell_pid == $sysparams[pid] ]] && _p9k_worker_stop
   return 0
 }
 
 function _p9k_worker_stop() {
+  # See comments in _p9k_worker_cleanup.
+  emulate -L zsh
   add-zsh-hook -D zshexit _p9k_worker_cleanup
   [[ -n $_p9k__worker_resp_fd     ]] && zle -F $_p9k__worker_resp_fd
   [[ -n $_p9k__worker_resp_fd     ]] && exec {_p9k__worker_resp_fd}>&-
@@ -178,15 +181,23 @@ function _p9k_worker_start() {
   setopt monitor || return
   {
     [[ -n $_p9k__worker_resp_fd ]] && return
-    _p9k__worker_file_prefix=${TMPDIR:-/tmp}/p10k.worker.$EUID.$sysparams[pid].$EPOCHSECONDS
+
+    if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+      local tmpdir=$TMPDIR
+    else
+      local tmpdir=/tmp
+    fi
+    _p9k__worker_file_prefix=$tmpdir/p10k.worker.$EUID.$sysparams[pid].$EPOCHSECONDS
 
     sysopen -r -o cloexec -u _p9k__worker_resp_fd <(
+      exec 0</dev/null
       if [[ -n $_POWERLEVEL9K_WORKER_LOG_LEVEL ]]; then
         exec 2>$_p9k__worker_file_prefix.log
         setopt xtrace
       else
         exec 2>/dev/null
       fi
+      builtin cd -q /                    || return
       zmodload zsh/zselect               || return
       ! { zselect -t0 || (( $? != 1 )) } || return
       local _p9k_worker_pgid=$sysparams[pid]
@@ -196,7 +207,7 @@ function _p9k_worker_start() {
         while syswrite $'\x05'; do zselect -t 1000; done
         zf_rm -f $_p9k__worker_file_prefix.fifo
         kill -- -$_p9k_worker_pgid
-      } &
+      }
       exec =true) || return
     _p9k__worker_pid=$sysparams[procsubstpid]
     zle -F $_p9k__worker_resp_fd _p9k_worker_receive

powerlevel10k.zsh-theme

@@ -19,8 +19,11 @@
 
 (( $+__p9k_root_dir )) || typeset -gr __p9k_root_dir=${POWERLEVEL9K_INSTALLATION_DIR:-${${(%):-%x}:A:h}}
 (( $+__p9k_intro )) || {
-  # Note: leading spaces before `local` are important. Otherwise Antigen will remove `local` (!!!).
-  typeset -gr __p9k_intro_base='emulate -L zsh -o no_hist_expand -o extended_glob -o no_prompt_bang -o prompt_percent -o no_prompt_subst -o no_aliases -o no_bg_nice -o typeset_silent
+  # Leading spaces before `local` are important. Otherwise Antigen will remove `local` (!!!).
+  # __p9k_trapint is to work around bugs in zsh: https://www.zsh.org/mla/workers/2020/msg00612.html.
+  # Likewise for `trap ":"` instead of the plain `trap ""`.
+  typeset -gr __p9k_intro_base='emulate -L zsh -o no_hist_expand -o extended_glob -o no_prompt_bang -o prompt_percent -o no_prompt_subst -o no_aliases -o no_bg_nice -o typeset_silent -o no_rematch_pcre
+  (( $+__p9k_trapped )) || { local -i __p9k_trapped; trap : INT; trap "trap ${(q)__p9k_trapint:--} INT" EXIT }
   local -a match mbegin mend
   local -i MBEGIN MEND OPTIND
   local MATCH OPTARG IFS=$'\'' \t\n\0'\'
@@ -54,21 +57,24 @@ function _p9k_init_locale() {
   if [[ $__p9k_dump_file != $__p9k_instant_prompt_dump_file ]] && (( ! $+functions[_p9k_preinit] )) && source $__p9k_dump_file 2>/dev/null && (( $+functions[_p9k_preinit] )); then
     _p9k_preinit
   fi
-  typeset -gr __p9k_sourced=7
-  if [[ -w $__p9k_root_dir && -w $__p9k_root_dir/internal && -w $__p9k_root_dir/gitstatus ]]; then
-    local f
-    for f in $__p9k_root_dir/{powerlevel9k.zsh-theme,powerlevel10k.zsh-theme,internal/p10k.zsh,internal/icons.zsh,internal/configure.zsh,internal/worker.zsh,internal/parser.zsh,gitstatus/gitstatus.plugin.zsh}; do
-      [[ $f.zwc -nt $f ]] && continue
-      zmodload -F zsh/files b:zf_mv b:zf_rm
-      local tmp=$f.tmp.$$.zwc
-      {
-        zcompile -R -- $tmp $f && zf_mv -f -- $tmp $f.zwc
-      } always {
-        (( $? )) && zf_rm -f -- $tmp
-      }
-    done
+  typeset -gr __p9k_sourced=13
+  if [[ $ZSH_VERSION == (5.<1->*|<6->.*) ]]; then
+    if [[ -w $__p9k_root_dir && -w $__p9k_root_dir/internal && -w $__p9k_root_dir/gitstatus ]]; then
+      local f
+      for f in $__p9k_root_dir/{powerlevel9k.zsh-theme,powerlevel10k.zsh-theme,internal/p10k.zsh,internal/icons.zsh,internal/configure.zsh,internal/worker.zsh,internal/parser.zsh,gitstatus/gitstatus.plugin.zsh,gitstatus/install}; do
+        [[ $f.zwc -nt $f ]] && continue
+        zmodload -F zsh/files b:zf_mv b:zf_rm
+        local tmp=$f.tmp.$$.zwc
+        {
+          # `zf_mv -f src dst` fails on NTFS if `dst` is not writable, hence `zf_rm`.
+          zf_rm -f -- $f.zwc && zcompile -R -- $tmp $f && zf_mv -f -- $tmp $f.zwc
+        } always {
+          (( $? )) && zf_rm -f -- $tmp
+        }
+      done
+    fi
   fi
-  source $__p9k_root_dir/internal/p10k.zsh || true
+  builtin source $__p9k_root_dir/internal/p10k.zsh || true
 }
 
 (( $+__p9k_instant_prompt_active )) && unsetopt prompt_cr prompt_sp || setopt prompt_cr prompt_sp