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I am using this function to toggle the mode-line display. But it does not always function when I call it repeatedly.

(defvar-local ramona-mode-line-rflog nil)

(defun ramona-mode-line ()
  "TODO."
  (interactive)

  (setq-local mode-line-format
               (if ramona-mode-line-rflog
                   (setq mode-line-format ramona-mode-line-rflog)
                 (setq ramona-mode-line-rflog mode-line-format)
                 (setq mode-line-format nil))))
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  • 1
    lists.gnu.org/archive/html/help-gnu-emacs/2022-11/msg00699.html - that was part of the discussion arising from your question.
    – NickD
    Nov 30, 2022 at 23:30
  • force-mode-line-update with the optional argument set to non-nil if so desired.
    – lawlist
    Dec 1, 2022 at 3:49
  • Still does not work when I call (force-mode-line-update t) everytime I reset mode-line-format.
    – Dilna
    Dec 1, 2022 at 11:39
  • Did you add the resetting of ramona-mode-line-rflog back to nil as pointed out in the link I pointed you to above?
    – NickD
    Dec 1, 2022 at 15:59
  • 1
    So you are making changes to your program and we are supposed to follow along using your descriptions? This is one reason that this is NOT A CONVERSATION SITE - as I have mentioned before and repeatedly: ask your question, accept or not accept any answer, but when you modify your program, you are now asking a new question - so make it a new question.
    – NickD
    Dec 1, 2022 at 18:54

1 Answer 1

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Inasmuch as the variable mode-line-format is always buffer-local, it does not need to be set with setq-local. Either the variable ramona-mode-line-rflog or the buffer-local value of mode-line-format should be compared to something that does not change, such as the (default-value 'mode-line-format). The default value of a buffer-local variable can be set with setq-default.

(defvar-local ramona-mode-line-rflog "foo")

(defun ramona-mode-line ()
  "TODO."
  (interactive)
  (setq mode-line-format
          (if (equal mode-line-format (default-value 'mode-line-format))
             ramona-mode-line-rflog
           (default-value 'mode-line-format)))
  (force-mode-line-update))
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  • Have resetted ramona-mode-line-rflog back to nil. But the modeline is gone and never toggles.
    – Dilna
    Dec 1, 2022 at 18:11
  • Then ramona-mode-line-rflog is not needed.
    – Dilna
    Dec 1, 2022 at 19:55
  • Did you even try the suggested solution? Starting from emacs -Q - a clean slate so to speak? You are randomly combining bits and pieces from previous attempts with this answer: don't! Start with emacs -Q, copy the answer to the *scratch* buffer, evaluate the two expressions with C-j after the closing paren, then keep evaluating (ramona-mode-line): it toggles between the default value and a mode line with just foo in it. Again, you are wasting everybody's time (and yours) by not reading carefully what people write and not following advice.
    – NickD
    Dec 1, 2022 at 20:26
  • I know it will have but am asking if using the variable can be avoided and just have the function.
    – Dilna
    Dec 1, 2022 at 21:05

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