shortlog: group by committer information

In some situations you may want to group the commits not by author,
but by committer instead.

For example, when I just wanted to look up what I'm still missing from
linux-next in the current merge window, I don't care so much about who
wrote a patch, as what git tree it came from, which generally boils
down to "who committed it".

So make git shortlog take a "-c" or "--committer" option to switch
grouping to that.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/shortlog.h b/shortlog.h
index 5a326c6860..5d64cfe929 100644
--- a/shortlog.h
+++ b/shortlog.h
@@ -13,6 +13,7 @@ struct shortlog {
 	int in2;
 	int user_format;
 	int abbrev;
+	int committer;
 
 	char *common_repo_prefix;
 	int email;