Re: Changing buffer mode

[carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Jul 22, 2022, 00:21 by incal@dataswamp.org:

> carlmarcos--- via Users list for the GNU Emacs text editor wrote:
>
>>>>>> With the following function I can change the mode of
>>>>>> a buffer. I would like to change it to use
>>>>>> `completing-read` using a list composed of a selection
>>>>>> of mode names. How can I go about doing that?
>>>>>>
>>>>>
>>>>> Use it?
>>>>>
>>>>>  (completing-read "drop: " '(little boy fat man))
>>>>>
>>>>
>>>> Yes, but then how can I update the buffer with the
>>>> new mode?
>>>>
>>>
>>> The same way you always do it?
>>>
>>
>> I do not know the usual way.
>>
>
> (emacs-lisp-mode) from Lisp and M-x emacs-lisp-mode RET
> interactively ...
>
Have come up with the following instead

(defun mode-sweep (mode)
  "Cycle the buffer through three major modes (text, org, normal)."

  (interactive
   (list
    (let ( (cseq '("org-mode" "text-mode" "normal-mode")) )
      (completing-read "Mode: " cseq nil t "normal"))))

  (apply (list (intern mode))) )