Add stylish-haskell

[igniting]

Run stylish-haskell on Haskell buffers every time they are saved.

[begriffs]

Oh good idea, thanks for the pull request. Is there a way to disable the auto-format-on-save though and make the reformatting happen manually on the whole buffer or a visual selection?

[igniting]

stylish-haskell formats only the import statements and the {-# LANGUAGE #-} pragmas. To use it, we have to call :%!stylish-haskell. I added vim-stylish-haskell which runs it automatically on save. I can remove the vim plugin, if it seems a better option.

[igniting]

I removed the vim plugin. Users would have to call %!stylish-haskell to run stylish-haskell.

[begriffs]

Thank you! What do you think about making it the default format program, so when you press gq on a selection it gets used (the format program is currently par)?

https://github.com/begriffs/haskell-vim-now/blob/master/.vimrc#L28

Maybe use stylish-haskell only for Haskell buffers and par for all the others.

[igniting]

That sounds great! I'll update the PR.

[igniting]

Updated

[begriffs]

Finally can you please add a note in the readme explaining this feature?

[igniting]

Done

[begriffs]

Hey does this actually work for you? When I make a small selection and press gq I get an error

Language.Haskell.Stylish.Parse.parseModule: could ¬parse <unknown>:
  ParseFailed (SrcLoc "<unknown>.hs" 7 1) "TemplateHaskell is not enabled"

The region I selected didn't have any template haskell in it, so I'm not sure what's going on or if you get a similar error.

[igniting]

It works fine for me. Do you encounter this for every file? Someone had reported a similar error upstream haskell/stylish-haskell#3 , but that was long back.

[begriffs]

Maybe it was just the region I happened to select. It worried me that maybe it was breaking all the time for everyone, but if it works OK for you then it's fine. I'll wait until someone else submits an issue before looking into it further.