GNU bug report logs - #70596
30.0.50; key-translate returns error for key sequences with punctuation marks

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alexander Prähauser <ahprae <at> protonmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Fri, 26 Apr 2024 17:29:35 +0000

I think this is a bug: emacs returns an error message for the
following command:

(key-translate "C-." "C-a")

The backtrace is the following:

Debugger entered--Lisp error: (wrong-type-argument characterp 67108910)
key-translate("C-." "C-g")
(let ((print-level nil) (print-length nil)) (key-translate "C-." "C-g"))
(setq elisp--eval-defun-result (let ((print-level nil) (print-length nil)) (key-translate "C-." "C-g")))
elisp--eval-defun()
#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_38>()
eval-defun(nil)
funcall-interactively(eval-defun nil)
command-execute(eval-defun)

I also tested this on an Emacs version I just downloaded and compiled
and started without an init. This is in spite of the fact that

(key-valid-p " C-.")

returns t. I also tried

(key-translate "C-<period>" "C-a")

for which I get a different error:

Debugger entered--Lisp error: (wrong-type-argument fixnump C-period)
  key-translate("C-<period>" "C-a")
  (progn (key-translate "C-<period>" "C-a"))
  (let ((print-level nil) (print-length nil)) (progn (key-translate "C-<period>" "C-a")))
  (setq elisp--eval-defun-result (let ((print-level nil) (print-length nil)) (progn (key-translate "C-<period>" "C-a"))))
  elisp--eval-defun()
  #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_38>()
  eval-defun(nil)
  funcall-interactively(eval-defun nil)
  command-execute(eval-defun record)
  execute-extended-command(nil "eval-defun" "eval-defun")
  funcall-interactively(execute-extended-command nil "eval-defun" "eval-defun")
  command-execute(execute-extended-command)



In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.18.0) of 2024-02-08 built on Archlaptop
Repository revision: 08c81db7c8e522278fb2c8de8fbe556d109c135f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101012
System Description: Arch Linux

Configured using:
 'configure --with-x-toolkit=no'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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  global-visual-line-mode: t
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Memory information:
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 (string-bytes 1 100500248) (vectors 16 686347) (vector-slots 8 9138408 1028223)
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Message #8 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alexander Prähauser <ahprae <at> protonmail.com>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Fri, 26 Apr 2024 21:28:59 +0300

> Date: Fri, 26 Apr 2024 17:29:35 +0000
> From:  Alexander Prähauser via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 
> I think this is a bug: emacs returns an error message for the
> following command:
> 
> (key-translate "C-." "C-a")
> 
> The backtrace is the following:
> 
> Debugger entered--Lisp error: (wrong-type-argument characterp 67108910)
> key-translate("C-." "C-g")

That's because C-. is not a valid character.  Valid characters with
the Control modifier are C-SPC to C-z.

Message #11 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Alexander Prähauser <ahprae <at> protonmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Sat, 27 Apr 2024 09:24:58 +0000

"Eli Zaretskii" <eliz <at> gnu.org> writes:

I see. But shouldn't (key-valid-p "C-.") return nil then?

>> Date: Fri, 26 Apr 2024 17:29:35 +0000
>> From:  Alexander Prähauser via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>>
>>
>> I think this is a bug: emacs returns an error message for the
>> following command:
>>
>> (key-translate "C-." "C-a")
>>
>> The backtrace is the following:
>>
>> Debugger entered--Lisp error: (wrong-type-argument characterp 67108910)
>> key-translate("C-." "C-g")
>
> That's because C-. is not a valid character.  Valid characters with
> the Control modifier are C-SPC to C-z.

Message #14 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alexander Prähauser <ahprae <at> protonmail.com>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Sat, 27 Apr 2024 13:12:49 +0300

> Date: Sat, 27 Apr 2024 09:24:58 +0000
> From: Alexander Prähauser <ahprae <at> protonmail.com>
> Cc: 70596 <at> debbugs.gnu.org
> 
> "Eli Zaretskii" <eliz <at> gnu.org> writes:
> 
> I see. But shouldn't (key-valid-p "C-.") return nil then?

No, because it's a valid key (but not a valid character).

Not every key is a character.  In fact, most keys are not valid
characters, because they name GUI function keys, like <Delete>.

Message #17 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Alexander Prähauser <ahprae <at> protonmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Sat, 27 Apr 2024 10:47:18 +0000

"Eli Zaretskii" <eliz <at> gnu.org> writes:

Ah, I see. Then I guess you can close this report. So is there no way to
translate C-. into C-g?

>> Date: Sat, 27 Apr 2024 09:24:58 +0000
>> From: Alexander Prähauser <ahprae <at> protonmail.com>
>> Cc: 70596 <at> debbugs.gnu.org
>>
>> "Eli Zaretskii" <eliz <at> gnu.org> writes:
>>
>> I see. But shouldn't (key-valid-p "C-.") return nil then?
>
> No, because it's a valid key (but not a valid character).
>
> Not every key is a character.  In fact, most keys are not valid
> characters, because they name GUI function keys, like <Delete>.

Message #20 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alexander Prähauser <ahprae <at> protonmail.com>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Sat, 27 Apr 2024 14:46:10 +0300

> Date: Sat, 27 Apr 2024 10:47:18 +0000
> From: Alexander Prähauser <ahprae <at> protonmail.com>
> Cc: 70596 <at> debbugs.gnu.org
> 
> "Eli Zaretskii" <eliz <at> gnu.org> writes:
> 
> Ah, I see. Then I guess you can close this report. So is there no way to
> translate C-. into C-g?

I don't think so, but I added Stefan in case I'm wrong.

Message #23 received at 70596 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Alexander Prähauser <ahprae <at> protonmail.com>
Cc: 70596 <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50; key-translate returns error for key
 sequences with punctuation marks
Date: Sat, 27 Apr 2024 22:51:33 -0400

> (key-translate "C-." "C-a")

`key-translate` works by modifying `keyboard-translate-table` which is
a table remapping *characters* and not *keys*.

IOW, `key-translate` is a misnomer.

> Ah, I see.  Then I guess you can close this report.  So is there no way
> to translate `C-.` into `C-g`?

There are different ways to "translate" keys, and they all work slightly
differently.  If you expect to be able to hit `C-.` (instead of `C-g`)
to interrupt a running command, then that's more delicate to do
(because such interruptions use a mechanism that doesn't go through
keymaps like normal commands do), but otherwise something like

    (define-key input-decode-map (kbd "C-.") (kbd "C-g"))

might do the trick.


        Stefan

Message #28 received at 70596-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: ahprae <at> protonmail.com, 70596-done <at> debbugs.gnu.org
Subject: Re: bug#70596: 30.0.50;
 key-translate returns error for key sequences with punctuation marks
Date: Thu, 02 May 2024 12:21:20 +0300

> Cc: 70596 <at> debbugs.gnu.org
> Date: Sat, 27 Apr 2024 22:51:33 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> > (key-translate "C-." "C-a")
> 
> `key-translate` works by modifying `keyboard-translate-table` which is
> a table remapping *characters* and not *keys*.
> 
> IOW, `key-translate` is a misnomer.
> 
> > Ah, I see.  Then I guess you can close this report.  So is there no way
> > to translate `C-.` into `C-g`?
> 
> There are different ways to "translate" keys, and they all work slightly
> differently.  If you expect to be able to hit `C-.` (instead of `C-g`)
> to interrupt a running command, then that's more delicate to do
> (because such interruptions use a mechanism that doesn't go through
> keymaps like normal commands do), but otherwise something like
> 
>     (define-key input-decode-map (kbd "C-.") (kbd "C-g"))
> 
> might do the trick.

Thanks.  The ELisp manual already hinted on this; I've now added some
more explicit motivation, and I'm therefore closing this bug.

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