Add global minor mode with autoloads

[haxney]

Right now, smex needs to be initialized explicitly with smex-initialize in the user's init.el file. This could be eliminated by creating a global minor mode for smex which sets up and tears down the settings. By using define-minor-mode with a non-nil :global keyword, a defcustom will be generated automatically, allowing users to toggle smex on and off through customize. The define-minor-mode should have a ;;;###autoload token to allow it to be activated purely through a user's custom file.

To enable the keybinding, smex should remap execute-extended-command rather than overwriting its global definition. This could be accomplished using the following in the body of define-minor-mode:

(if smex-mode
    (global-set-key [remap execute-extended-command] 'smex)
  (global-unset-key [remap execute-extended-command]))

This way, smex only makes nondestructive changes.

[haxney]

Actually, I'll probably create a pull request for this. Stay tuned...

[milkypostman]

/bump

I would really like this.

[milkypostman]

er, at least a minor-mode for smex would be nice.

[jgeerds]

@nonsequitur Any news here?