[PATCH] format_commit_message: honor `color=auto` for `%C(auto)`

[Edward Thomson <ethomson@edwardthomson.com>]

Check that we are configured to display colors in the given context when
the user specifies a format string of `%C(auto)`.  This brings that
behavior in line with the behavior of `%C(auto,<colorname>)`, which will
display the given color only when the configuration specifies to do so.

This allows the user the ability to specify that color should be
displayed only when the output is a tty, and to use the default color
for the given context (instead of a hardcoded color value).

Signed-off-by: Edward Thomson <ethomson@edwardthomson.com>
---
 pretty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pretty.c b/pretty.c
index 87c4497..c3ec430 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1063,7 +1063,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	switch (placeholder[0]) {
 	case 'C':
 		if (starts_with(placeholder + 1, "(auto)")) {
-			c->auto_color = 1;
+			c->auto_color = want_color(c->pretty_ctx->color);
 			return 7; /* consumed 7 bytes, "C(auto)" */
 		} else {
 			int ret = parse_color(sb, placeholder, c);
-- 
2.6.4 (Apple Git-63)