grepdiff: invert match

[camsteffen]

There should be a flag like -v, --invert-match in grep.

See https://stackoverflow.com/questions/57628550/grepdiff-find-hunks-that-dont-match-a-given-regexp (someone else's question).

My use case is to "unstage hunks that do not match" in git:

git diff --staged -U1 | grepdiff foo --invert-match --output-matching=hunk | git apply --cached -R

[twaugh]

--invert-match sounds like the right parameter name for this. Probably needs an invert_regexecs() similar to match regexecs(), and a way of switching between them appropriately (maybe a function pointer).

I don't have time to code this myself right now. Want to have a go at it?

[camsteffen]

Thanks for your response. I'm also a little too busy to claim this right now.

[jansmets]

Would be useful indeed.