From: Robert Pluim <rpluim@gmail.com>
To: Ihor Radchenko <yantar92@gmail.com>
Cc: 57693@debbugs.gnu.org
Subject: bug#57693: 29.0.50; Is there a more reliable version of `char-displayable-p'?
Date: Fri, 09 Sep 2022 15:46:40 +0200 [thread overview]
Message-ID: <87sfl07j9b.fsf@gmail.com> (raw)
In-Reply-To: <87v8pw1xyo.fsf@localhost> (Ihor Radchenko's message of "Fri, 09 Sep 2022 21:25:35 +0800")
>>>>> On Fri, 09 Sep 2022 21:25:35 +0800, Ihor Radchenko <yantar92@gmail.com> said:
Ihor> Hello,
Ihor> In Org, we have recently had a need to check if a Unicode character can
Ihor> be displayed in buffer.
Ihor> We used the following:
Ihor> (...
Ihor> (if (and (display-graphic-p)
Ihor> (char-displayable-p ?⭠)
Ihor> (char-displayable-p ?─))
Ihor> "⭠ now ───────────────────────────────────────────────"
Ihor> "now - - - - - - - - - - - - - - - - - - - - - - - - -")
Ihor> ...)
Ihor> However, char-displayable-p returned false-positive for one user:
Ihor> https://list.orgmode.org/orgmode/87mtddhprr.fsf@localhost/
Ihor> False-positives are indeed not unexpected in char-displayable-p; just as
Ihor> its docstring warns. However, I am now wondering if there is some more
Ihor> accurate way to know if a character can be actually displayed on buffer
Ihor> or not.
Iʼd look at the guts of `describe-char-display' in
"lisp/descr-text.el" for inspiration (or even use it as is). It takes
a `pos' argument so you may have to wrap it in `with-temp-buffer' +
`insert'.
Robert
--
next prev parent reply other threads:[~2022-09-09 13:46 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-09 13:25 bug#57693: 29.0.50; Is there a more reliable version of `char-displayable-p'? Ihor Radchenko
2022-09-09 13:38 ` Eli Zaretskii
2022-09-09 22:25 ` Stefan Kangas
2022-09-10 6:01 ` Eli Zaretskii
2022-09-10 6:06 ` Ihor Radchenko
2022-09-10 6:35 ` Eli Zaretskii
2022-09-10 6:44 ` Ihor Radchenko
2022-09-10 4:48 ` Ihor Radchenko
2022-09-10 6:24 ` Eli Zaretskii
2022-09-10 6:37 ` Ihor Radchenko
2022-09-10 7:56 ` Eli Zaretskii
2022-09-10 8:17 ` Ihor Radchenko
2022-09-10 8:42 ` Eli Zaretskii
2022-09-11 9:31 ` Ihor Radchenko
2022-09-11 9:43 ` Eli Zaretskii
2022-09-11 10:07 ` Eli Zaretskii
2022-09-12 5:46 ` Ihor Radchenko
2022-09-12 11:15 ` Eli Zaretskii
2022-09-13 1:44 ` Ihor Radchenko
2022-09-13 11:19 ` Eli Zaretskii
2022-09-14 1:52 ` Ihor Radchenko
2022-09-14 2:43 ` Eli Zaretskii
2023-02-17 19:18 ` Stefan Kangas
2023-02-17 19:29 ` Eli Zaretskii
2023-02-17 22:31 ` Stefan Kangas
2023-02-18 6:56 ` Eli Zaretskii
2023-02-18 9:00 ` Stefan Kangas
2023-02-18 9:18 ` Eli Zaretskii
2023-02-18 11:32 ` Ihor Radchenko
2023-02-18 11:56 ` Eli Zaretskii
2023-02-19 11:31 ` Ihor Radchenko
2023-02-19 11:55 ` Eli Zaretskii
2023-02-19 12:08 ` Ihor Radchenko
2023-02-19 12:23 ` Eli Zaretskii
2023-02-19 14:19 ` Ihor Radchenko
2023-02-19 15:02 ` Eli Zaretskii
2023-02-18 11:35 ` Ihor Radchenko
2023-02-18 12:00 ` Eli Zaretskii
2022-09-12 5:24 ` Ihor Radchenko
2022-09-09 13:46 ` Robert Pluim [this message]
2022-09-09 22:25 ` Stefan Kangas
2022-09-10 4:56 ` Ihor Radchenko
2022-09-10 6:02 ` Eli Zaretskii
2022-09-10 4:53 ` Ihor Radchenko
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