[Proposal] Formatter plugin to pre-format (or re-format) elixir files

[Zach Daniel]

I've tried setting the extensions list to `[".ex", ".exs"]`, but it looks like it isn't possible to write a custom formatter that would run on elixir files. The use case (something that Ash users are currently asking for) is a way to enforce consistency in their usage of the DSL using a formatter of some kind. I could go the route that surface originally went w/ a custom mix task for formatting, but being a formatter plugin would be *far* simpler.

So some potential ideas that would let me do this:

1. allow writing a plugin that takes .ex and .exs files and formats them either ahead of or behind the main formatter (ahead of would be better in this case because I'll want to run the formatter on the code after I've done my work).

2. allow specifying that `use`ing certain modules causes the contents of the using module to be formatted by my plugin, e.g `sigils: [], extensions: [".ex", ".exs"], using: [Ash.Resource]` (this would end up being configurable by end users because some Ash users have a resource wrapper, e.g `use MyApp.Resource`)

I'm happy to PR either of the above, or something else :)

[José Valim]

We have added support for overwriting the formatter for .ex and .exs in the v1.13 branch. It may have been released on v1.13.2 already.

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[Zach Daniel]

oh, excellent! Thanks!