I looked into this and initially I wanted to use git stash --keep-index however this lead to difficulties when the hooks fix files, and then the stash conflicts with the changes.

I want to implement this in a way so that in the worst case the working directory ends up in the same way as it started. I believe this will be sufficient:

@contextlib.contextmanager
def staged_files_only():
    ## pseudopython
    if [[ unstaged files ]]:
        ## --binary is important here because otherwise binary files are not preserved in diffs
        # `git diff --binary > .pre-commit-files/patch
        ## clean the working directory
        # `git checkout -- .`
        try:
            yield
        finally:
            ## Attempt to apply our stored patch
            try:
                # `git apply .pre-commit-files/patch
            except CalledProcessError:
                ## Applying the patch failed do to some conflict so rollback any changes made by hooks
                # `git checkout -- .`
                # `git apply .pre-commit-files/patch
    else:
        yield

Sunbelt Computer Software

PL/B Language Development and Support

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Only run hooks on staged files #30

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