Hello.

I sometimes have some random files which I haven't committed and don't necessarily plan to, but I don't want to add them to the '.gitignore'. Reuse complains about those files.

It would be awesome if I could run reuse with a --ignore-untracked option, which ignores all files which aren't in git index.

comment by @carmenbianca :

Other linters, pylint etc, when run via pre-commit, only run against staged/tracked files. This is a behaviour of pre-commit, which passes (I think) a list of files to the linters. reuse differs here, because there's presently no way to run the linter against a subset of files.

Let's create lint-file to lint a subset of files, and then allow the pre-commit to be configured to use that instead of lint.