Change Details

WithColor provides a way to change text color temporarily but it resets colors in the destructor regardless of the previous color. Consider this example: ``` { WithColor Red(outs(), raw_ostream::RED); Red << "AAA\n"; WithColor(outs(), raw_ostream::BLUE) << "BBB\n"; Red << "CCC\n"; } ``` In this example "CCC" is not colored with red because the WithColor instance for the blue color resets the color in its destructor. This patch adds NestableWithColor, A RAII object like WithColor but it supports restoring previous colors to handle this "nested" situation: ``` NestableWithColorContext Ctx; { NestableWithColor Red(outs(), Ctx, raw_ostream::RED); Red << "AAA\n"; NestableWithColor (outs(), Ctx, raw_ostream::BLUE) << "BBB\n"; Red << "CCC\n"; } ``` With NestableWithColor, its destructor restores color states saved in NestableWithColorContext and prints "CCC" in red.

WithColor provides a way to change text color temporarily but currently it resets colors in the destructor regardless of the previous color. Consider this example: ``` { WithColor Red(outs(), raw_ostream::RED); Red << "AAA\n"; WithColor(outs(), raw_ostream::BLUE) << "BBB\n"; Red << "CCC\n"; } ``` In this example "CCC" is not colored with red because the WithColor instance for the blue color resets the color in its destructor. This patch adds WithColorContext, A object which stores color states and it allows WithColor to restore previous colors: ``` WithColorContext Ctx; { WithColor Red(outs(), raw_ostream::RED, false, false, false, &Ctx); Red << "AAA\n"; WithColor(outs(), raw_ostream::BLUE, false, false, false, &Ctx) << "BBB\n"; Red << "CCC\n"; } ``` With WithColorContext, WithColor's destructor restores color states and prints "CCC" in red.

WithColor provides a way to change text color temporarily but currently it resets colors in the destructor regardless of the previous color. Consider this example: ``` { WithColor Red(outs(), raw_ostream::RED); Red << "AAA\n"; WithColor(outs(), raw_ostream::BLUE) << "BBB\n"; Red << "CCC\n"; } ``` In this example "CCC" is not colored with red because the WithColor instance for the blue color resets the color in its destructor. This patch adds NestableWithColorContext, A RAIIA object like WithCwhich stores color butstates and it supportsallows restoring previous cWithColors to handle this "nested" situation:restore previous colors: ``` NestableWithColorContext Ctx; { NestableWithColor Red(outs(), raw_ostream::RED, false, false, Ctxfalse, raw_ostream::RED);&Ctx); Red << "AAA\n"; NestableWithColor (outs()WithColor(outs(), raw_ostream::BLUE, false, false, Ctxfalse, raw_ostream::BLUE&Ctx) << "BBB\n"; Red << "CCC\n"; } ``` With NestableWithColorContext, itsWithColor's destructor restores color states saved in NestableWithColorContext and and prints "CCC" in red.