Wip tools lint-file

[mbarbin]

This is an alternate to #40 where the command is named tools lint-file and will have an --in-place flag too.

Work in progress.

[mbarbin]

@arvidj Please have a look when you get a chance. I made the changes we talked about in #40 to rename dunolint tools lint-file and have an --in-place flag.

I added tests and a changelog entry too, presumably we'll go with this PR instead if this checks out on your side. Thanks!

[arvidj]

It works on the terminal as I'd expect. Works with Emacs reformatter with the updated definition:

(reformatter-define dunolint-format
  :program "dunolint"
  :args (list "tools" "lint-file" "--filename" (buffer-file-name))
  :lighter " DoF")

Works with pre-commit using the updated hook definition:

  - repo: local
    hooks:
      - id: dunolint
        name: Dunolint
        description: This hook runs dunolint on 'backend/sre/hydra'
        language: system
        entry: dunolint
        args: ["tools", "lint-file", "--in-place"]
        files: '*dune$' # To be refined...
        types: [text]

In sum, LGTM. If we settle on this version, I can make a separate PR to update the README.md with instructions for how to set up emacs and pre-commit for users that want that.

[mbarbin]

Excellent, thanks a lot! I'm merging this.

By the way, beyond the use in editor setup, I also started finding usage for this function when writing tests and documentation, so I'm definitely happy to have this join the set of commands for the project.

PR for the readme sounds perfect to me, thanks a lot!