Re: Intelligent stacking of messages in the echo area

[Juri Linkov <juri@linkov.net>]

>> Good heuristics.  Another heuristics that could be added is
>> to filter out transient messages ending with ellipsis -
>> added here to a new variable like Eli asked to do:
>
> Just to say thank you.  I've been using this bit of code for the past
> two or three weeks and it works very well.
>
> I added to your regex for my particular situation:
>
> #+begin_src elisp
>   (defcustom multi-message-transient "\\(\\.\\.\\.\\'\\|^,\\|^C-\\|^pop3 retrieved\\)"
>     "Regexp to filter out transient messages that should not be stacked."
>     :type 'regexp
>     :group 'minibuffer
>     :version "28.1")
> #+end_src

Thanks.  This means that this option multi-message-transient is useful after all.
BTW, I customized it to "^Mark\\|\\.\\.\\.\\'" to skip mark-related messages
like "Mark set" and "Mark deactivated".

Now what remains to do is to combine multi-message feature with minibuffer-message,
so when the minibuffer is not active then multi-line messages are displayed
in the echo-area, otherwise multi-line messages are displayed at the end
of the minibuffer:

(defun set-multi-message--wrapper (orig-fun message)
  (let* ((multi-message (set-multi-message message)))
    (or (funcall orig-fun multi-message)
        multi-message)))

(setq set-message-function 'set-minibuffer-message)
(add-function :around set-message-function #'set-multi-message--wrapper)