Add a 'source' decorator for commits

We already support decorating commits by tags or branches that point to
them, but especially when we are looking at multiple branches together,
we sometimes want to see _how_ we reached a particular commit.

We can abuse the '->util' field in the commit to keep track of that as
we walk the commit lists, and get a reasonably useful view into which
branch or tag first reaches that commit.

Of course, if the commit is reachable through multiple sources (which is
common), our particular choice of "first" reachable is entirely random
and depends on the particular path we happened to follow.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/builtin-log.c b/builtin-log.c
index a0944f70a4..176cbce308 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -56,6 +56,8 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 		if (!strcmp(arg, "--decorate")) {
 			load_ref_decorations();
 			decorate = 1;
+		} else if (!strcmp(arg, "--source")) {
+			rev->show_source = 1;
 		} else
 			die("unrecognized argument: %s", arg);
 	}