Re: Calling (interactive) when choice is nil

> Is it generally a good idea to call (interactive) when choice is nil?

I don't understand the question.

> (defun xia-dedicated-display-set (&optional choice)
>   ""
>   (interactive)
>   (let ((selection (or choice
>                        (completing-read "Display: "
>                          '("new-window" "new-frame" "reuse") nil t))))
>     (setq xia-dedicated-display (intern selection))
>     (message "xia-dedicated-display set to: %s" xia-dedicated-display)))

I'd recommend moving the user-interaction to the `interactive` form:

    (defun xia-dedicated-display-set (selection)
      ""
      (interactive
       (list (intern (completing-read "Display: "
                                      '("new-window" "new-frame" "reuse") nil t))))
      (setq xia-dedicated-display selection)
      (message "xia-dedicated-display set to: %S" xia-dedicated-display))


=== Stefan