GNU bug report logs - #47215
28.0.50; Let M-x switch between M-x and M-X

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Felician Nemeth <felician.nemeth <at> gmail.com>
Cc: 47215 <at> debbugs.gnu.org
Subject: bug#47215: 28.0.50; Let M-x switch between M-x and M-X
Date: Sun, 04 Apr 2021 21:52:21 +0200

Felician Nemeth <felician.nemeth <at> gmail.com> writes:

>> I'm not quite sure how to implement this, though -- we basically end up
>> in `completing-read', and `execute-extended-command-for-buffer' would
>> have to define an `M-x' binding there, I guess...  and then somehow call
>> `read-extended-command' with the text already in the minibuffer.
>>
>> Anybody got an idea as to how to implement this without rewriting
>> `read-extended-command' completely?
>
> The execute-extended-commands have two undocumented optional arguments
> (command-name and typed).  What are they used for?
>
> Anyway, following the fallback logic of `ido-find-file', I was able to
> rebind `M-x' and save the content of the minibuffer with a non-standard
> exit from `execute-extended-command'.  Maybe the ugly code below can
> give ideas to someone more knowledgeable.

Thanks -- I was wondering more about the situation where you've typed

M-X foo|bar

(| for point)

and then hit `M-x' because you want to switch to the other mode.
Ideally, `M-x' should do that, and also preserve the text the user has
typed, and the cursor position.  I don't see an obvious simple way to do
that... 

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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