The Brittany code fixer needs a maintainer. The previous one had to step away. It has a unique approach to code formatting that the ormolu/fourmolu formatters doesn’t. There’s lots of the philosophy and such in the docs.

I like it better than the ormolu family because it respects your placement of comments and just formats the code itself. But it isn’t maintained as of a few years ago.

https://hackage.haskell.org/package/brittany