[llvm-cov] Add support for creating html reports

Based on a patch by Harlan Haskins!

Differential Revision: http://reviews.llvm.org/D18278

llvm-svn: 274688

llvm/tools/llvm-cov/CodeCoverage.cpp

@@ -272,6 +272,8 @@ int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
       "format", cl::desc("Output format for line-based coverage reports"),
       cl::values(clEnumValN(CoverageViewOptions::OutputFormat::Text, "text",
                             "Text output"),
+                 clEnumValN(CoverageViewOptions::OutputFormat::HTML, "html",
+                            "HTML output"),
                  clEnumValEnd),
       cl::init(CoverageViewOptions::OutputFormat::Text));
 
@@ -333,6 +335,11 @@ int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
                             ? sys::Process::StandardOutHasColors()
                             : UseColor == cl::BOU_TRUE;
       break;
+    case CoverageViewOptions::OutputFormat::HTML:
+      if (UseColor == cl::BOU_FALSE)
+        error("Color output cannot be disabled when generating html.");
+      ViewOpts.Colors = true;
+      break;
     }
 
     // Create the function filters
@@ -527,6 +534,9 @@ int CodeCoverageTool::report(int argc, const char **argv,
   if (Err)
     return Err;
 
+  if (ViewOpts.Format == CoverageViewOptions::OutputFormat::HTML)
+    error("HTML output for summary reports is not yet supported.");
+
   auto Coverage = load();
   if (!Coverage)
     return 1;