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* Add "header" to GHC_COLORSPhil Ruffwind2017-05-221-5/+12
| | | | | | | | | | | | | | | | | Add "header" to GHC_COLORS and allow colors to be inherited from the surroundings. Test Plan: validate Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #13718 Differential Revision: https://phabricator.haskell.org/D3599
* Allow colors to be customizedPhil Ruffwind2017-03-231-0/+88
Allow customization of diagnostic colors through the GHC_COLORS environment variable. Some color-related code have been refactored to PprColour to reduce the circular dependence between DynFlags, Outputable, ErrUtils. Some color functions that were part of Outputable but were never used have been deleted. Test Plan: validate Reviewers: austin, hvr, bgamari, dfeuer Reviewed By: bgamari, dfeuer Subscribers: dfeuer, rwbarton, thomie, snowleopard Differential Revision: https://phabricator.haskell.org/D3364