Make diffcore_std only can run once before a diff_flush
When file renames/copies detection is turned on, the
second diffcore_std will degrade a 'C' pair to a 'R' pair.
And this may happen when we run 'git log --follow' with
hard copies finding. That is, the try_to_follow_renames()
will run diffcore_std to find the copies, and then
'git log' will issue another diffcore_std, which will reduce
'src->rename_used' and recognize this copy as a rename.
This is not what we want.
So, I think we really don't need to run diffcore_std more
than one time.
Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
index 4a350e3..f0985bc 100644
--- a/diff.c
+++ b/diff.c
@@ -3737,6 +3737,12 @@
void diffcore_std(struct diff_options *options)
{
+ /* We never run this function more than one time, because the
+ * rename/copy detection logic can only run once.
+ */
+ if (diff_queued_diff.run)
+ return;
+
if (options->skip_stat_unmatch)
diffcore_skip_stat_unmatch(options);
if (options->break_opt != -1)
@@ -3756,6 +3762,8 @@
DIFF_OPT_SET(options, HAS_CHANGES);
else
DIFF_OPT_CLR(options, HAS_CHANGES);
+
+ diff_queued_diff.run = 1;
}
int diff_result_code(struct diff_options *opt, int status)
