log --format: teach %C(auto,black) to respect color config

Traditionally, %C(color attr) always emitted the ANSI color
sequence; it was up to the scripts that wanted to conditionally
color their output to omit %C(...) specifier when they do not want
colors.

Optionally allow "auto," to be prefixed to the color, so that the
output is colored iff we would color regular "log" output
(e.g., taking into account color.* and --color command line
options).

Tests and pretty_context bits by Jeff King <peff@peff.net>.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/commit.h b/commit.h
index 9f2131318d..73fd399b09 100644
--- a/commit.h
+++ b/commit.h
@@ -89,6 +89,7 @@ struct pretty_print_context {
 	int show_notes;
 	struct reflog_walk_info *reflog_info;
 	const char *output_encoding;
+	int color;
 };
 
 struct userformat_want {