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, 2 insertions, 3 deletions

diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index d9cad13c465..b63447faa1c 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -138,12 +138,11 @@ struct MarkerStyle {
   /// The starting char (before tildes) for marking the line.
   char Lead;
   /// What color to use for this annotation.
-  raw_ostream::Colors Color;
+  raw_ostream::Color Color;
   /// A note to follow the marker, or empty string if none.
   std::string Note;
   MarkerStyle() {}
-  MarkerStyle(char Lead, raw_ostream::Colors Color,
-              const std::string &Note = "")
+  MarkerStyle(char Lead, raw_ostream::Color Color, const std::string &Note = "")
       : Lead(Lead), Color(Color), Note(Note) {}
 };