Customize haddock comments color

Question

How can I change the color of the comments starting with -- | in Haskell mode?

When I write a comment in Haskell I get a grey face, but when the comment starts with -- |, as required by Haddock documentation lines, it takes a green one. I have tried to change the Haskell Literate Comment Face to inherit from font-lock-doc-face to font-lock-comment-face, but it has had no effect over the comments starting with -- |.

Edited: Ok. Now I see the problem. The face of these comments is not Haskell Literate Comment Face, it is directly font-lock-doc-face (?). If I change it, the comments reflect the change. But why is it like this? I would like to change the color of the doc-comments only for Haskell, not globally.

Answer 1

I would like to change the color of the doc-comments only for Haskell, not globally.

You can combine the buffer-local effects of Face Remapping with a mode hook to achieve this. For example, in order to display Haddock comments with the same face as plain comments, you can write something like

(add-hook 'haskell-mode-hook
          (lambda ()
            (face-remap-add-relative 'font-lock-doc-face
                                     'font-lock-comment-face)))

Answer 2

Assume it had no effect, because font-lock-comment-face is set to grey too.

Try M-x customize-face RET haskell-literate-comment-face RET

Then disable the check-box "inherit", open the now enabled menu and edit the values at place.

WRT your comment: Looks like a bug. See in haskell-mode-autoloads.el

(defface haskell-literate-comment-face '((t :inherit font-lock-doc-face))

Maybe editing it there will help. Might require a re-compile than, as the *.elc files --if present-- will be loaded.