M-RET ok, C-RET wrong?

M-RET ok, C-RET wrong?

[Kepa via Users list for the GNU Emacs text editor]

Hello,



I’m experiencing strange behavior when setting a keybinding.

C-RET keybinding does not work for me, and I have had to use C-<return>, although M-RET does work:

This doesn’t work:

(define-key dired-mode-map (kbd "C-RET") 'dired-w32explore)

I receive this message:

C-<return> is undefined


This works, though:

(define-key dired-mode-map (kbd "C-<return>") 'dired-w32explore)

This works too:

(define-key dired-mode-map (kbd "M-RET") 'dired-create-directory)


GNU Emacs 29.3 (build 2, x86_64-w64-mingw32) of 2024-03-24


Best regards

Re: M-RET ok, C-RET wrong?

[Eli Zaretskii]

> Date: Sat, 24 Aug 2024 04:51:16 +0000
> From:  Kepa via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
> 
> C-RET keybinding does not work for me, and I have had to use C-<return>, although M-RET does work:

I think that's because RET is actually C-m, and you cannot have two
Ctrl modifiers on the same key.

Re: M-RET ok, C-RET wrong?

[Arash Esbati]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Sat, 24 Aug 2024 04:51:16 +0000
>> From:  Kepa via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
>> 
>> C-RET keybinding does not work for me, and I have had to use
>> C-<return>, although M-RET does work:
>
> I think that's because RET is actually C-m, and you cannot have two
> Ctrl modifiers on the same key.

(key-valid-p "C-RET") => t

@Kepa: What do you get with:

(keymap-set dired-mode-map "C-RET" 'dired-w32explore)

Best, Arash

Re: M-RET ok, C-RET wrong?

[Eli Zaretskii]

> From: Arash Esbati <arash@gnu.org>
> Date: Sat, 24 Aug 2024 09:16:04 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I think that's because RET is actually C-m, and you cannot have two
> > Ctrl modifiers on the same key.
> 
> (key-valid-p "C-RET") => t

Ha!

> @Kepa: What do you get with:
> 
> (keymap-set dired-mode-map "C-RET" 'dired-w32explore)

I'm not Kepa, but I get the same result.  Although I actually tried

   (keymap-set global-map "C-RET" 'dired)

Re: M-RET ok, C-RET wrong?

[Arash Esbati]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Arash Esbati <arash@gnu.org>
>> Date: Sat, 24 Aug 2024 09:16:04 +0200
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > I think that's because RET is actually C-m, and you cannot have two
>> > Ctrl modifiers on the same key.
>> 
>> (key-valid-p "C-RET") => t
>
> Ha!
>
>> @Kepa: What do you get with:
>> 
>> (keymap-set dired-mode-map "C-RET" 'dired-w32explore)
>
> I'm not Kepa, but I get the same result.  Although I actually tried
>
>    (keymap-set global-map "C-RET" 'dired)

I can confirm this with your recipe as well.  So this is a deficiency in
`key-valid-p'?

Best, Arash

Re: M-RET ok, C-RET wrong?

[Eli Zaretskii]

> From: Arash Esbati <arash@gnu.org>
> Cc: help-gnu-emacs@gnu.org
> Date: Sat, 24 Aug 2024 09:56:57 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Arash Esbati <arash@gnu.org>
> >> Date: Sat, 24 Aug 2024 09:16:04 +0200
> >> 
> >> Eli Zaretskii <eliz@gnu.org> writes:
> >> 
> >> > I think that's because RET is actually C-m, and you cannot have two
> >> > Ctrl modifiers on the same key.
> >> 
> >> (key-valid-p "C-RET") => t
> >
> > Ha!
> >
> >> @Kepa: What do you get with:
> >> 
> >> (keymap-set dired-mode-map "C-RET" 'dired-w32explore)
> >
> > I'm not Kepa, but I get the same result.  Although I actually tried
> >
> >    (keymap-set global-map "C-RET" 'dired)
> 
> I can confirm this with your recipe as well.  So this is a deficiency in
> `key-valid-p'?

I guess so.  Patches welcome to fix that.

Re: M-RET ok, C-RET wrong?

[Kepa via Users list for the GNU Emacs text editor]

> From:     Eli Zaretskii
> Subject:     Re: M-RET ok, C-RET wrong?
> Date:     Sat, 24 Aug 2024 12:30:13 +0300
>
> > From: Arash Esbati <arash@gnu.org>
> > Cc: help-gnu-emacs@gnu.org
> > Date: Sat, 24 Aug 2024 09:56:57 +0200
> >
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> > >> From: Arash Esbati <arash@gnu.org>
> > >> Date: Sat, 24 Aug 2024 09:16:04 +0200
> > >>
> > >> Eli Zaretskii <eliz@gnu.org> writes:
> > >>
> > >> > I think that's because RET is actually C-m, and you cannot have two
> > >> > Ctrl modifiers on the same key.
> > >>
> > >> (key-valid-p "C-RET") => t
> > >
> > > Ha!
> > >
> > >> @Kepa: What do you get with:
> > >>
> > >> (keymap-set dired-mode-map "C-RET" 'dired-w32explore)
> > >
> > > I'm not Kepa, but I get the same result.  Although I actually tried
> > >
> > >    (keymap-set global-map "C-RET" 'dired)
> >
> > I can confirm this with your recipe as well.  So this is a deficiency in
> > `key-valid-p'?
>
> I guess so.  Patches welcome to fix that.

A couple of additional details, in case they are helpful:

1. Keyboards usually have two RET keys: one near the letters and one on 
the numpad. I receive two different messages when using each of them:

     C-<return> is undefined (letters)
     C-<enter> is undefined (numpad)

2. C-RET works in org-mode, where the following keybinding exists (I 
believe by default):
     Key Bindings: org-mode-map C-<return>

Best regards!

Re: M-RET ok, C-RET wrong?

[Eli Zaretskii]

> Date: Sat, 24 Aug 2024 12:06:23 +0200
> From:  Kepa via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
> 
> 1. Keyboards usually have two RET keys: one near the letters and one on 
> the numpad. I receive two different messages when using each of them:
> 
>      C-<return> is undefined (letters)
>      C-<enter> is undefined (numpad)

in my case the second on is identified as C-<kp-enter> instead.

> 2. C-RET works in org-mode, where the following keybinding exists (I 
> believe by default):
>      Key Bindings: org-mode-map C-<return>

Of course: if C-<return> has a binding, C-RET will invoke it.  That's
what Emacs basically tells you when it says "C-<return> is undefined".

Re: M-RET ok, C-RET wrong?

[Kepa via Users list for the GNU Emacs text editor]

> From:     Eli Zaretskii
> Subject:     Re: M-RET ok, C-RET wrong?
> Date:     Sat, 24 Aug 2024 13:16:12 +0300
>
> > Date: Sat, 24 Aug 2024 12:06:23 +0200
> > From:  Kepa via Users list for the GNU Emacs text editor
> > <help-gnu-emacs@gnu.org>
> >
> > 1. Keyboards usually have two RET keys: one near the letters and one on
> > the numpad. I receive two different messages when using each of them:
> >
> >      C-<return> is undefined (letters)
> >      C-<enter> is undefined (numpad)
>
> in my case the second on is identified as C-<kp-enter> instead.

Just if it's useful: M-RET doesn't work with the numpad RET.

Re: M-RET ok, C-RET wrong?

[Eli Zaretskii]

> Date: Sat, 24 Aug 2024 12:22:48 +0200
> From:  Kepa via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
> 
> > From:     Eli Zaretskii
> > Subject:     Re: M-RET ok, C-RET wrong?
> > Date:     Sat, 24 Aug 2024 13:16:12 +0300
> >
> > > Date: Sat, 24 Aug 2024 12:06:23 +0200
> > > From:  Kepa via Users list for the GNU Emacs text editor
> > > <help-gnu-emacs@gnu.org>
> > >
> > > 1. Keyboards usually have two RET keys: one near the letters and one on
> > > the numpad. I receive two different messages when using each of them:
> > >
> > >      C-<return> is undefined (letters)
> > >      C-<enter> is undefined (numpad)
> >
> > in my case the second on is identified as C-<kp-enter> instead.
> 
> Just if it's useful: M-RET doesn't work with the numpad RET.

And it shouldn't.