Adding the option --repos-without-matches

[djgoku]

--repos-without-matches returns all repositories not containing a match. It is the inverse of what --repos-with-matches returns. Example all-repos-grep some-text-not-in-repos --repos-without-matches.

@asottile thanks for all the software you write!

Not sure if this is something you have wanted or needed. I will say I did add repos-without-matches as an option to all-repos-find-files but it isn't returning repositories not containing a searched file e.g.: all-repos-find-files .gitignore --repos-without-matches.

[asottile]

I had previously rejected this but I'm not quite sure where so I'll reiterate the problems here:

• this breaks --repos prefix matching (I actually didn't even know the argument was --repos-with-matches tbh!)
• there's existing ways to accomplish the same thing (repos without root .gitignore might be something like all-repos-list-repos --output-paths | xargs --replace bash -c 'test -f {}/.gitignore || echo {}', repos with pre-commit config not containing flake8 all-repos-grep --repos -L flake8 -- .pre-commit-config.yaml, etc.)
• it's sort of ambiguous with all-repos-grep -L so I'd rather not introduce a confusing option