Emacs hangs in haskell-mode with inferior-haskell-load-file call

Question

When in a Haskell file, I use C-c C-l to run the command inferior-haskell-load-file which is intended to load the current file into the GHCI interprete

Answer 1

Old question, but as I just ran into this today, I wanted to share how to actually customize comint-prompt-regexp since I had to figure it out.

This customization will recognize λ> prompts, or actually any single character before >), but it doesn't break the existing regex. In your .emacs:

(load-library "inf-haskell")

(defun my-inf-haskell-hook ()
  (setq comint-prompt-regexp 
        (concat comint-prompt-regexp "\\|^.> ")))

(add-to-list 'inferior-haskell-mode-hook 'my-inf-haskell-hook)

You can add more dots to "\\|^.> " to recognize a longer prompt, but I wanted to keep it fixed-length for simplicity.