When I press the F9 key I want to call the ef-themes-select function and when I press F9 a second time to call the modus-themes-select function. I want to toggle between them each time I press the F9 key.

Both functions bring up a minibuffer completion in which a new theme can be selected. So, the first time I press F9, ef-themes-select will display a minibuffer to select a different Ef theme. The second time I press F9, modus-themes-select should be called. However, we need to take into consideration the second time F9 is pressed it is issued in the minibuffer that opened first.

    (use-package ef-themes
      (load-theme 'ef-summer t)
      :bind ("<f9>" . my/select-themes))
    (use-package modus-themes
      :bind ("<f9>" . my/select-themes))

Can someone help me write this function to do the behavior I'm looking for?

    (defun my/select-themes ()
    ;; ...

The function doesn't need to remember the theme that is currently active, just call the functions in a toggling manner.

  • Are you sure you'd prefer this 'design'? Because the common approach for calling two different variants of a function is by using a universal argument. Feb 3, 2023 at 12:50
  • And if it's just one variant, can the F key be used? Then I'll use two different F keys instead.
    – Zoli
    Feb 3, 2023 at 12:57
  • Well @sds provided a nice answer already, of course. If always calling modus-themes-select first, and if calling ef-themes-select directly after it causes no further problems, e.g. that a second minibuffer gets opened or you see a message 'attempt to open another minibuffer from minibuffer', then the repeated F9 key solution is fine; it could even get adapted so that it closes the first mini-buffer before opening the second (which is probably what your comment about it is hinting at). I was just indicating the common alternative approach (which does not automatically mean the best approach) Feb 3, 2023 at 16:08
  • emacs.stackexchange.com/tags/elisp/info
    – Drew
    Feb 3, 2023 at 16:38

1 Answer 1


Use last-command:

(defun my/select-themes ()
  (if (eq last-command 'my/select-themes)

If this design (F9 for ef-themes-select and F9 F9 for modus-themes-select) is what you want, this is the way to go.

If you want F9 to run ef-themes-select and C-u F9 to run modus-themes-select, you can use Prefix Command Arguments:

(defun my/select-themes (arg)
  (interactive "P")
  (if arg
  • Thank you. A user mentioned above that using universal argument is better. I'm not sure what he meant by that. Is it a problem that I bind the function to an F key? As far as I know F5-F9 is free for the user to bind.
    – Zoli
    Feb 3, 2023 at 15:03
  • @Zoli: see edit
    – sds
    Feb 3, 2023 at 15:08
  • The first is the one I want. Thank you.
    – Zoli
    Feb 3, 2023 at 15:18

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