Print out the ref name given on the command line by which each
commit was reached.
+--use-mailmap::
+ Use mailmap file to map author and committer names and email
+ to canonical real names and email addresses. See
+ linkgit:git-shortlog[1].
+
--full-diff::
Without this flag, "git log -p <path>..." shows commits that
touch the specified paths, and diffs about the same specified