Stylish Haskell

Use M-x haskell-mode-stylish-buffer to call stylish-haskell on the current buffer.

On Save

To call it for every save, you first need haskell-mode-save-buffer. It is recommended to rebind C-x C-s in haskell-mode to this. Add the following in your haskell-mode-hook.

(define-key haskell-mode-map (kbd "C-x C-s") 'haskell-mode-save-buffer)

To enable Stylish Haskell, pop the following somewhere in your Emacs configuration:

(setq haskell-stylish-on-save t)

Or in your custom set variables:

(custom-set-variables '(haskell-stylish-on-save t))

Or you can M-x customize-group haskell and pretend none of this exists!