Improve raw_ostream so that you can "write" colors using operator<<

1. raw_ostream supports ANSI colors so that you can write messages to
the termina with colors. Previously, in order to change and reset
color, you had to call `changeColor` and `resetColor` functions,
respectively.

So, if you print out "error: " in red, for example, you had to do
something like this:

  OS.changeColor(raw_ostream::RED);
  OS << "error: ";
  OS.resetColor();

With this patch, you can write the same code as follows:

  OS << raw_ostream::RED << "error: " << raw_ostream::RESET;

2. Add a boolean flag to raw_ostream so that you can disable colored
output. If you disable colors, changeColor, operator<<(Color),
resetColor and other color-related functions have no effect.

Most LLVM tools automatically prints out messages using colors, and
you can disable it by passing a flag such as `--disable-colors`.
This new flag makes it easy to write code that works that way.

Differential Revision: https://reviews.llvm.org/D65564

llvm-svn: 367649

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/tools/llvm-cov/CoverageReport.cpp b/llvm/tools/llvm-cov/CoverageReport.cpp
index 82259542c59..1750d18d4e0 100644
--- a/llvm/tools/llvm-cov/CoverageReport.cpp
+++ b/llvm/tools/llvm-cov/CoverageReport.cpp
@@ -111,7 +111,7 @@ void renderDivider(ArrayRef<size_t> ColumnWidths, raw_ostream &OS) {
 /// Return the color which correponds to the coverage percentage of a
 /// certain metric.
 template <typename T>
-raw_ostream::Colors determineCoveragePercentageColor(const T &Info) {
+raw_ostream::Color determineCoveragePercentageColor(const T &Info) {
   if (Info.isFullyCovered())
     return raw_ostream::GREEN;
   return Info.getPercentCovered() >= 80.0 ? raw_ostream::YELLOW