Error when initializing haskell-mode

[linhmtran168]

After enabling haskell layout in spacemacs, I keep seeing this error when emacs starting

An error occurred while initializing haskell-mode (error: (file-error Cannot open

I think this is related to the fact that haskell-yas was removed from haskell-mode (haskell/haskell-mode#618)

[alanz]

I tried adding haskell-snippets to the required package list, but it is not installed. I ended up getting it to load by commenting out as below

(defun haskell/init-haskell-mode ()
  ;; (require 'haskell-yas)

But obviously then there are not snippets.

[syl20bnr]

Thank you for the report, this is fixed in develop and current release.

[syl20bnr]

Seems that there is another issue, I'll look into it this evening.

[syl20bnr]

OK should be good now :-)

[lebensterben]

I've found a fix for this:

(defun haskell/post-init-yasnippet ()
  (spacemacs/add-to-hooks 'spacemacs/load-yasnippet
                          '(haskell-mode-hook haskell-literate-mode-hook)))

(defun haskell/init-haskell-snippets ()
  (use-package haskell-snippets
    :defer t
    :hook (yas-minor-mode . haskell-snippets-initialize)))

The first part actually is optional, but it's conventional to call spacemacs/load-yasnippet first, which would add yasnippet-snippets(if installed) to yas-snippet-dirs.

Then when haskell-snippets package is not excluded, yasnippet would also add it to yas-snippet-dirs.

This will be included in a coming PR.