builtin/diff-index: learn --merge-base

There is currently no easy way to take the diff between the working tree
or index and the merge base between an arbitrary commit and HEAD. Even
diff's `...` notation doesn't allow this because it only works between
commits. However, the ability to do this would be desirable to a user
who would like to see all the changes they've made on a branch plus
uncommitted changes without taking into account changes made in the
upstream branch.

Teach diff-index and diff (with one commit) the --merge-base option
which allows a user to use the merge base of a commit and HEAD as the
"before" side.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/diff.h b/diff.h
index fedfeab7a2..6c2efa16fd 100644
--- a/diff.h
+++ b/diff.h
@@ -589,6 +589,7 @@ void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb);
 int run_diff_files(struct rev_info *revs, unsigned int option);
 
 #define DIFF_INDEX_CACHED 01
+#define DIFF_INDEX_MERGE_BASE 02
 int run_diff_index(struct rev_info *revs, unsigned int option);
 
 int do_diff_cache(const struct object_id *, struct diff_options *);