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Sign upFix repo.index.diff("HEAD", create_patch=True) always returning an empty list #948
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This PR resolves the issue reported in #852
As @jadinm correctly identified in #852, this bug centers around the fact that the regex utilized by
_index_from_patch_format()ingit/diff.pyalways expects the first line of the diff to have theafile first, thenb:When the
otherpassed torepo.index.diff(other)is notNonethe-Rargument is added to the git command, resulting in the positions of theaandbfiles being flipped in the output and causing the_index_from_patch_format()function invoked by thecreate_patchoption to not find a regex match:This fix makes the regex slightly more permissive, allowing it to match either order of the
aandbfiles in the output ofgit diff.For test coverage of this change I added assertions to an existing test within
test_diff.pythat set up everything needed to reproduce this bug.Massive props to @jadinm, their troubleshooting and feedback on the issue significantly shortened the investigation required to get this one sorted out🎉