Re: diff-index --cc no longer permitted, gitk is now broken (slightly)

Junio C Hamano [off-list ref] writes:

Sergey Organov [off-list ref] writes:

quoted

Here is a patch that fixes diff-index to accept --cc again:

Sorry for the delay; I did not notice there was a patch buried in a
discussion thread.

Sorry from my side as well. I was already about to re-submit the patch
properly, but you happened to be faster with this )

We might later need to do this suppression in more codepaths if we
find more regressions, but let's have one fix at a time.  

Will queue.

quoted

 builtin/diff-index.c |  6 +++---
 diff-merges.c        | 14 ++++----------
 diff-merges.h        |  2 +-

This would deserve new tests that cover the existing use cases,
given that both of us (and other reviewers in the original thread)
did not notice how big a regression we are causing.

Yep, it's too easy to break undocumented and untested behavior.

We care about --cc naturally falling back to -p when there is only
one other thing to compare with, and also we care about --cc that
allows us to compare during conflict resolution, at least, I think.

I'm all for more tests, but I'm afraid I'm not in a good position to
write them, especially for an undocumented behavior. I think somebody
should first document what --cc/-c does in diff-index, and only then
it makes sense to write some tests.

It can and should come as a separate step, of course.  Unbreaking
gitk for an already known breakage would be more urgent than hunting
for other breakages, even though the latter might result in a more
thorough fix in the end.

Makes sense.

Thanks,
-- Sergey Organov