* bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
@ 2021-09-24 18:33 Stefan Kangas
2021-09-25 2:03 ` Lars Ingebrigtsen
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Kangas @ 2021-09-24 18:33 UTC (permalink / raw)
To: 50785
Severity: minor
In "emacs -Q", if I use the following function:
(defun foo ()
(interactive)
(error (substitute-command-keys "Use \\[next-line]")))
The error message says "Use C-n", but "C-n" is not displayed with the
`help-key-binding' face.
In contrast, `message' does not have this problem:
(defun foo2 ()
(interactive)
(message (substitute-command-keys "Use \\[next-line]")))
Here, "C-n" is displayed with the correct face.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
2021-09-24 18:33 bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys Stefan Kangas
@ 2021-09-25 2:03 ` Lars Ingebrigtsen
2022-08-29 16:29 ` Lars Ingebrigtsen
0 siblings, 1 reply; 5+ messages in thread
From: Lars Ingebrigtsen @ 2021-09-25 2:03 UTC (permalink / raw)
To: Stefan Kangas; +Cc: 50785
Stefan Kangas <stefan@marxist.se> writes:
> In "emacs -Q", if I use the following function:
>
> (defun foo ()
> (interactive)
> (error (substitute-command-keys "Use \\[next-line]")))
>
> The error message says "Use C-n", but "C-n" is not displayed with the
> `help-key-binding' face.
Hm... is `error' stripping text properties before displaying, by any
chance? If so, is there any particular reason why that would make sense
in general? Hm... perhaps the idea is that `error' is used in
low-level circumstances, so we don't want to rely on faces etc actually
working?
Anybody know?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
2021-09-25 2:03 ` Lars Ingebrigtsen
@ 2022-08-29 16:29 ` Lars Ingebrigtsen
2022-08-29 17:32 ` Stefan Kangas
0 siblings, 1 reply; 5+ messages in thread
From: Lars Ingebrigtsen @ 2022-08-29 16:29 UTC (permalink / raw)
To: Stefan Kangas; +Cc: 50785
Lars Ingebrigtsen <larsi@gnus.org> writes:
> Hm... is `error' stripping text properties before displaying, by any
> chance? If so, is there any particular reason why that would make sense
> in general? Hm... perhaps the idea is that `error' is used in
> low-level circumstances, so we don't want to rely on faces etc actually
> working?
>
> Anybody know?
The error message are output (by default) by print_error_message. It
simply does `princ' on the string with a PRINTCHARFUN of t, which is the
minibuffer. And if you do that, then you lose the text properties:
(defun foo2 ()
(interactive)
(princ (substitute-command-keys "Use \\[next-line]") t))
We probably don't want to change something as fundamental as that, so if
we want to fix this, we have to change print_error_message to just call
Fmessage instead, I guess?
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys
2022-08-29 16:29 ` Lars Ingebrigtsen
@ 2022-08-29 17:32 ` Stefan Kangas
2022-08-30 10:25 ` Lars Ingebrigtsen
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Kangas @ 2022-08-29 17:32 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: 50785
Lars Ingebrigtsen <larsi@gnus.org> writes:
> The error message are output (by default) by print_error_message. It
> simply does `princ' on the string with a PRINTCHARFUN of t, which is the
> minibuffer. And if you do that, then you lose the text properties:
>
> (defun foo2 ()
> (interactive)
> (princ (substitute-command-keys "Use \\[next-line]") t))
>
> We probably don't want to change something as fundamental as that, so if
> we want to fix this, we have to change print_error_message to just call
> Fmessage instead, I guess?
That's the fix we've used on a Lisp level -- avoiding `princ' in favor
of `insert', etc.
Perhaps it would be nice with a `princ' that preserves text properties?
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-08-30 10:25 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2021-09-24 18:33 bug#50785: 28.0.50; error doesn't use help-key-binding face from substitute-command-keys Stefan Kangas
2021-09-25 2:03 ` Lars Ingebrigtsen
2022-08-29 16:29 ` Lars Ingebrigtsen
2022-08-29 17:32 ` Stefan Kangas
2022-08-30 10:25 ` Lars Ingebrigtsen
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