I'm using prelude mode, and in a file .emacs.d/personal/old-settings.el I have, amongst other things:

(global-set-key (kbd "C-c C-c") 'comment-region)

(add-hook 'c-mode-common-hook
        (local-set-key  (kbd "C-c o") 'ff-find-other-file)))

Now when editing a c++-mode file, comment-region has been set, but ff-find-other-file hasn't.

I did F1 v c-mode-common-hook and see this:

c-mode-common-hook is a variable defined in `cc-vars.el'.
Its value is ((lambda nil
   (kbd "C-c o")
(lambda nil
  (run-hooks 'prelude-c-mode-common-hook)))

How would I go about debugging this? There doesn't seem to be a way to list-hooks, detect if the hook had already fired, etc.

  • C-c C-c is bound to comment-region in c++-mode by default (against my wishes). BTW, M-; is the standard global binding to comment a region (using comment-dwim which provides a superset of the functionality of comment-region) and the use of C-c C-c for it is an old habit that's mildly discouraged. – Stefan May 24 '17 at 12:57
  1. You could print a message from your hook, like this:

    (add-hook 'c-mode-common-hook (lambda() (message "fired") (local-set-key (kbd "C-c o") 'ff-find-other-file)))

  2. You can have a look at the current mode and his Key-Bindings with C-h m

  3. You can write a short config.el which only handels the Part you try to debug and start it with emacs -Q -l config.el

Btw: I have done all 3 steps above and the hook fires.

Can someone help me formating this code-snippet? :)

  • Thanks, I think that has me going in the right direction. It seems that prelude mode has gone and defined a series of conflicting key-bindings, which I found via 2) above. 4 spaces at start of each line make the snippet appear as intended. – tlrrd May 24 '17 at 11:07
  • Glad I could help. Indenting did not work, because the code is in a list ... it seems – jue May 24 '17 at 11:50
  • Thanks, I managed to identify that it was a conflicting keybinding doing this and I can now disable prelude mode by adding (prelude-off) to the hook as follows: (add-hook 'c-mode-common-hook (lambda() (prelude-off) (local-set-key (kbd "C-c o") 'ff-find-other-file))) – tlrrd May 24 '17 at 13:15

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