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This gives it the same behavior as we had prior to 1d282327 (status: show branchname with a configurable color). To do this we need the concept of a "NIL" color, which is provided by color.[ch]. The implementation is very simple; in particular, there are no precautions taken against code accidentally printing the NIL. This should be fine in practice because: 1. You can't input a NIL color in the config, so it must come from the in-code defaults. Which means it is up the client code to handle the NILs it defines. 2. If we do ever print a NIL, it will be obvious what the problem is, and the bug can be fixed. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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