Add support for color diagnostics. #274
Merged
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By default, the diagnostic printer will detect whether stderr is
connected to a TTY and use ANSI color sequences if so. We use the
same colors that
swiftc
uses for its diagnostics: white for themain text, red for error labels, magenta for warning labels, and
gray for note labels. Additionally, we use yellow to emphasize the
finding category for diagnostics that come from linter findings.
This behavior can be controlled manually using the
--color-diagnostics/--no-color-diagnostics
flag pair.