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I've installed smex through MELPA as a replacement for the default M-x (execute-extended-command). The issue is that in smex, certain global keybindings don't work. For instance, C-h should work as backspace, yet in smex it's still bound to default help.

(global-set-key (kbd "C-h") 'delete-backward-char)

Any idea why the above global-set-key might not work in smex, while it does elsewhere (in minibuffer, eshell, etc.)?

Addendum to Jesse's answer

When using ido-vertical-mode one should also rebind M-p:

(defun ido-vertical-define-keys ()
(define-key ido-completion-map (kbd "C-n") 'ido-next-match)
(define-key ido-completion-map (kbd "C-p") 'ido-prev-match)
(define-key ido-completion-map (kbd "M-p") 'previous-history-element))
  • IMO C-h is way more valuable as a help binding (especially C-h v, C-h f and C-h k/C-h c) unless you prefer to use F1 instead. – Kaushal Modi May 22 '15 at 18:56
  • @kaushalmodi, but isn't backspace somewhat out of reach? Or do you use some other binding for delete-backward-char altogether? – Blaz May 22 '15 at 19:03
  • I've got used to DEL (backspace) and C-DEL; don't find it that inconvenient. Probably I use C-d and M-d equally or more. – Kaushal Modi May 22 '15 at 19:06
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    About the edit you made related to ido-vertical-mode.. note that you then are losing the C-p and C-n bindings which are more intuitive for up/down navigation in ido-vertical-mode. You should copy that whole function to your emacs config and then only edit the bindings you care about. – Kaushal Modi May 22 '15 at 19:14
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I also had this problem and couldn't fix. My workaround was overriding the smex keybindings function:

(defun smex-prepare-ido-bindings ()
  (define-key ido-completion-map (kbd "TAB") #'minibuffer-complete)
  (define-key ido-completion-map (kbd "M-p") #'previous-history-element)
  (define-key ido-completion-map (kbd "M-.") #'smex-find-function)
  (define-key ido-completion-map (kbd "C-h") #'delete-backward-char)
  (define-key ido-completion-map (kbd "C-a") #'move-beginning-of-line))
  • Nice. There's only one snag: M-p doesn't get defined and is still bound to "ido-toggle-prefix, which is an interactive compiled Lisp function in `ido.el'." – Blaz May 22 '15 at 18:37
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    @courteous I bet you have ido-vertical installed too because that sets M-p binding to ido-toggle-prefix (as it needs to use the original binding of ido-toggle-prefix.. C-p for ido-prev-match (ido match navigation)). To change that, you will need to override the ido-vertical-define-keys function in the same fashion as this solution for overriding bindings set by smex. – Kaushal Modi May 22 '15 at 18:51
  • @kaushalmodi, ido-vertical it is. That fixed the M-p as well. Regarding your edit of Jesse's answer: what difference do hashtags # make? Also, how did you go about finding that it is ido-vertical-define-keys that must be overridden? – Blaz May 22 '15 at 19:00
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    @courteous My approach to find such bindings is probably unconventional but I simply did ag 'p.*ido-toggle-prefix' in my ~/.emacs.d and emacs source code lisp/ directories... and about the sharp-quotes. ag is like grep but faster. – Kaushal Modi May 22 '15 at 19:09

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