Andrey Hsiao <andreyhs...@gmail.com> writes:

> Dear list:
>
> Just encountered the --merge option for git log.
>
> In the man page, it has the following explanation:
> - After a failed merge, show refs that touch files having a conflict
> and don't exist on all heads to merge.

        git log --merge [options] -- $paths

is roughly the same as

        git log [options] HEAD...MERGE_HEAD -- $paths'

where $paths' is $paths limited to those with conflicts.  You can
further think of that as a rough equivalent of

        git log [options] ^X HEAD MERGE_HEAD -- $paths'

where X is the merge base between the tips of these two branches:

    X---o---o---o---H
     \
      o---o---o---M

And the commits among these ('o's, H and M in the picture), the ones
that change any of the $paths' are shown.  If you further limit the
output (e.g. with -n<n>, or --since=<time>), you may not see all of
them, of course.
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