Add Ruff

[shikanime]

Ruff is a Python linter that is starting to get a lot of attention lately.

[shikanime]

Oh, at the moment, it seems that Ruff is only available on Nixpkgs version 22.11.

[domenkozar]

I'll try to bump checks to 22.11

[domenkozar]

If you rebase it should work now

[dhess]

FYI, I believe this commit broke the flake. We now get:

error: Function called without required argument "ruff" at /nix/store/lvwknwz9wfx66qyxdcak5p6w2wfxlzpd-source/nix/tools.nix:32, did you mean "duff", "guff" or "rufo"?

[shikanime]

Please correct me if I'm wrong, as the package is only available in 22.11 release, should I have added a default to null ?

[dhess]

@shikanime Possibly. This happens when I use pre-commit-hooks.nix with haskell.nix, which is, I believe, using a pre-22.11 nixpkgs-unstable pin. There's a PR to bump it: input-output-hk/haskell.nix#1815

Also, we're using follows like so with the haskell.nix nixpkgs:

pre-commit-hooks-nix.inputs.nixpkgs.follows = "nixpkgs";

so this probably wasn't something you tested for.

[shikanime]

Thanks for the extra details, I didn't realize the follows mechanism worked like that after reading the documentation.
Sorry for the inconveniences (⁠｡⁠ŏ⁠﹏⁠ŏ⁠)

[dhess]

No worries at all, thanks for the contribution.