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I use Aquamacs. C-; is bound to toggle-mac-option-modifier. When I use C-h k C-;, I get

^; runs the command toggle-mac-option-modifier, which is an interactive Lisp function in `emulate-mac-keyboard-mode.el'.

I want to remove this keybinding so I can use elsewhere. I have tried

(global-unset-key (kbd "C-;"))
(define-key toggle-mac-option-modifier [C-\;] nil)
(define-key emulate-mac-keyboard-mode [C-\;] nil)
(define-key emulate-mac-keyboard-mode [?\C-\;] nil)
(define-key emulate-mac-keyboard-mode [C-\;] nil)
(define-key emulate-mac-keyboard-mode [control-\;] nil)
(define-key emulate-mac-keyboard-mode-map [control-\;] nil)
(define-key emulate-mac-keyboard-mode [control \;] nil)
(define-key emulate-mac-keyboard-mode (kbd "C-;") nil)
(define-key toggle-mac-keyboard-modifier (kbd "C-;") nil)
(define-key toggle-mac-option-modifier "C-;" nil)

I keep getting the error that the

symbol's value as variable is void

After much searching I found somewhere that maybe the value of the variable had not been initialised, so I tried those after

(require 'emulate-mac-keyboard-mode)

with the same result. I also tried

(eval-after-load 'emulate-mac-keyboard-mode
  '(progn
     (define-key emulate-mac-keyboard-mode [C-\;] nil)))

How can I unset this key?

  • +1 for showing your work. ;) Clarifying question: does "I want to remove this keybinding so I can use elsewhere" mean you want to bind toggle-mac-option-modifier to a different key, or you want to use C-; for a different command? If the former, it's not a problem to have the same command bound to multiple keys -- no need to unbind. If the latter, you can just set the binding to a new command without unbinding it first. – Dan Sep 18 '15 at 12:47
  • In the 30 minutes I spent trying to figure this out, I was thinking of you, @Dan. Every time I try to do something simple in Emacs, I waste hours. Emacs for me is a means to an end, I don't always have the time it requires and often I just learn to live with things the way they are :( – Vivi Sep 18 '15 at 23:18
  • I wanted to bind commenting in and out everywhere to C-; . That seems quite hard though as it seems like the name of the function is different in every mode. In latex it is comment-or-uncomment-region, bound to C-c ; , in lisp it is paredit-comment-dwim bound to M-; , in matlab it is matlab-comment-region bound to C-c ; . When I try to use (global-set-key (kbd "C-;") comment-dwim) it says that "symbol's value as a variable is void: comment-dwim. I think I will live with the keybindings as they are. – Vivi Sep 18 '15 at 23:22
  • I think I see the problem: try #'comment-dwim instead. – Dan Sep 18 '15 at 23:23
  • @Dan That said, I still don't like C-; bound to toggle-mac-keyboard-modifier. I often press it by mistake and I want to remove that keybinding. How can I do that (ie, what I asked in the question)? – Vivi Sep 18 '15 at 23:23
2

I've switched to the railwaycat/homebrew-emacsmacport so I can't test this easily but I used to do this on Aquamacs:

(define-key osx-key-mode-map (kbd "C-;") nil) ; was toggle-mac-option-modifier
  • Oh, my king! Thank you, that solved the problem :) – Vivi Sep 19 '15 at 1:17

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