From: Eli Zaretskii <eliz@gnu.org>
To: rms@gnu.org
Cc: emacs-devel@gnu.org
Subject: Re: Display of undisplayable characters: \U01F3A8 instead of diamond
Date: Tue, 30 Aug 2022 14:41:49 +0300 [thread overview]
Message-ID: <83pmgiufeq.fsf@gnu.org> (raw)
In-Reply-To: <E1oSsba-00065k-NL@fencepost.gnu.org> (message from Richard Stallman on Tue, 30 Aug 2022 00:12:02 -0400)
> From: Richard Stallman <rms@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Tue, 30 Aug 2022 00:12:02 -0400
>
> > No, because displaying a non-ASCII character on a text-mode terminal
> > requires to encode it.
>
> Maybe the existing mechamisms will insist on encoring it, but I think
> it won't be hard to bypass that step. The user could specify the
> encoded sequence to send, by putting that sequence in a variable as a
> string or vector.
>
> Then redisplay simply has to send the sequence of characters
> from the vector, _as if_ they were the result of encoding something.
This is possible technically, but it isn't safe, because figuring out
the correct encoding of the terminal and producing a suitably-encoded
byte sequence is tricky at best, for users to get right. And this is
going to misfire if the user ever uses a terminal with a different
encoding.
More importantly, we are talking about a fallback feature, used for
characters that fail to display in any other way we know. What you
suggest is inappropriate for such fallback methods, which must be 110%
safe.
Using a display-table is therefore a much better way of adapting Emacs
to the specific desires of the user in this case. For starters, the
character codes emitted by the display-table are encoded as usual,
when written to the terminal.
> > This arranges for all the characters beyond 255 to be displayed as the
> > diamond with a special face. (You can, of course, adjust the range of
> > characters for which this is done according to your needs, or have
> > several disjoint ranges instead of just one.)
>
> > Would that be good enough for your use patterns?
>
> With 255 specified, it would not be adequate. The Linux console handles
> the Greek alphabet, the Russian alphabet, and I am not sure what else.
Then maybe change #x100 to #x530 as the first approximation.
> Using several disjoint ranges could do the job, I suppose,
> if someone can tell me how to determine what those ranges should be.
>
> Could this be figured out automatically by calling char-displayable-p
> on each character code?
Such a code can be written, and can use char-displayable-p, indeed.
> Up to what number would that loop have to run?
Up to (and including) #x10FFFF.
next prev parent reply other threads:[~2022-08-30 11:41 UTC|newest]
Thread overview: 264+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 3:33 Display of undisplayable characters: \U01F3A8 instead of diamond Richard Stallman
2022-08-26 5:21 ` Emanuel Berg
2022-08-26 6:45 ` Eli Zaretskii
2022-08-26 8:23 ` Emanuel Berg
2022-08-26 8:45 ` Emanuel Berg
2022-08-26 9:05 ` Yuri Khan
2022-08-26 9:11 ` Emanuel Berg
2022-08-26 9:28 ` Yuri Khan
2022-08-26 9:40 ` Emanuel Berg
2022-08-26 9:47 ` Emanuel Berg
2022-08-26 9:50 ` Yuri Khan
2022-08-26 9:54 ` Emanuel Berg
2022-08-26 9:50 ` Emanuel Berg
2022-08-28 4:04 ` Richard Stallman
2022-08-28 6:10 ` Eli Zaretskii
2022-08-28 6:51 ` Emanuel Berg
2022-08-28 7:04 ` Emanuel Berg
2022-08-28 7:09 ` Emanuel Berg
2022-08-28 7:10 ` Eli Zaretskii
2022-08-28 7:21 ` Emanuel Berg
2022-08-26 6:52 ` Kévin Le Gouguec
2022-08-26 7:15 ` Eli Zaretskii
2022-08-26 8:37 ` Emanuel Berg
2022-08-26 8:52 ` Emanuel Berg
2022-08-26 9:24 ` Emanuel Berg
2022-08-26 9:25 ` Andreas Schwab
2022-08-26 9:32 ` Emanuel Berg
2022-08-26 17:41 ` Kévin Le Gouguec
2022-08-26 19:34 ` Emanuel Berg
2022-08-28 4:04 ` Richard Stallman
2022-08-28 5:32 ` Emanuel Berg
2022-08-26 9:58 ` Gregory Heytings
2022-08-26 10:11 ` Emanuel Berg
2022-08-26 10:59 ` Gregory Heytings
2022-08-26 11:31 ` Emanuel Berg
2022-08-26 12:15 ` Gregory Heytings
2022-08-26 12:56 ` Alan Mackenzie
2022-08-26 13:29 ` Gregory Heytings
2022-08-28 10:35 ` Alan Mackenzie
2022-08-28 10:41 ` Eli Zaretskii
2022-08-28 13:00 ` Gregory Heytings
2022-08-28 14:18 ` Eli Zaretskii
2022-08-28 14:44 ` Gregory Heytings
2022-08-28 15:05 ` Eli Zaretskii
2022-08-28 15:18 ` Gregory Heytings
2022-08-28 15:34 ` Eli Zaretskii
2022-08-28 15:53 ` Gregory Heytings
2022-08-28 16:00 ` Eli Zaretskii
2022-08-28 16:07 ` Gregory Heytings
2022-08-28 16:09 ` Eli Zaretskii
2022-08-28 20:07 ` Gregory Heytings
2022-08-29 11:03 ` Eli Zaretskii
2022-08-29 18:48 ` Gregory Heytings
2022-08-28 15:39 ` Alan Mackenzie
2022-08-28 15:43 ` Eli Zaretskii
2022-08-28 15:35 ` Alan Mackenzie
2022-08-28 15:37 ` Eli Zaretskii
2022-08-28 15:46 ` Gregory Heytings
2022-08-28 16:14 ` Alan Mackenzie
2022-08-28 16:53 ` Gregory Heytings
2022-08-28 18:27 ` Stefan Monnier
2022-08-28 18:44 ` Stefan Monnier
2022-08-28 18:45 ` Alan Mackenzie
2022-08-28 20:09 ` Gregory Heytings
2022-08-28 20:37 ` Alan Mackenzie
2022-08-28 20:09 ` Emanuel Berg
2022-08-28 14:25 ` Alan Mackenzie
2022-08-28 14:59 ` Gregory Heytings
2022-08-28 20:05 ` Emanuel Berg
2022-08-29 10:58 ` Eli Zaretskii
2022-08-29 11:26 ` Yuri Khan
2022-08-29 11:37 ` Eli Zaretskii
2022-08-29 12:21 ` Alan Mackenzie
2022-08-28 12:40 ` Gregory Heytings
2022-08-26 21:45 ` Alan Mackenzie
2022-08-26 22:56 ` Emanuel Berg
2022-08-27 7:12 ` Eli Zaretskii
2022-08-27 7:22 ` Visuwesh
2022-08-27 9:11 ` Eli Zaretskii
2022-08-27 10:43 ` Visuwesh
2022-08-28 4:04 ` Richard Stallman
2022-08-28 5:22 ` Eli Zaretskii
2022-08-28 10:07 ` Alan Mackenzie
2022-08-28 10:29 ` Eli Zaretskii
2022-08-28 11:07 ` Alan Mackenzie
2022-08-28 11:44 ` Eli Zaretskii
2022-08-28 13:56 ` Alan Mackenzie
2022-08-27 5:44 ` Akib Azmain Turja
2022-08-27 7:29 ` Andreas Schwab
2022-08-27 9:13 ` Eli Zaretskii
2022-08-27 17:24 ` Emanuel Berg
2022-08-27 17:41 ` Eli Zaretskii
2022-08-27 21:50 ` Emanuel Berg
2022-08-28 2:15 ` Emanuel Berg
2022-08-28 5:45 ` Eli Zaretskii
2022-08-28 6:02 ` Emanuel Berg
2022-08-27 17:22 ` Emanuel Berg
2022-08-29 3:36 ` Richard Stallman
2022-08-29 13:00 ` Eli Zaretskii
2022-08-30 4:12 ` Richard Stallman
2022-08-30 11:41 ` Eli Zaretskii [this message]
2022-08-30 12:15 ` Eli Zaretskii
2022-08-30 15:44 ` Gregory Heytings
2022-08-31 0:34 ` Emanuel Berg
2022-08-31 2:35 ` Eli Zaretskii
2022-08-31 3:00 ` Emanuel Berg
2022-08-31 11:00 ` Eli Zaretskii
2022-09-01 23:32 ` Richard Stallman
2022-09-01 23:39 ` Emanuel Berg
2022-09-01 23:49 ` Emanuel Berg
2022-09-02 6:37 ` Eli Zaretskii
2022-09-02 12:21 ` Akib Azmain Turja
2022-09-02 12:36 ` Eli Zaretskii
2022-09-02 12:39 ` Gregory Heytings
2022-09-03 2:51 ` Richard Stallman
2022-09-03 3:04 ` Emanuel Berg
2022-09-03 6:35 ` Akib Azmain Turja
2022-09-03 6:54 ` Gregory Heytings
2022-09-03 8:13 ` Emanuel Berg
2022-09-03 8:55 ` Gregory Heytings
2022-09-03 9:04 ` Emanuel Berg
2022-09-03 9:34 ` Eli Zaretskii
2022-09-03 9:42 ` Emanuel Berg
2022-09-03 9:55 ` Eli Zaretskii
2022-09-03 12:48 ` Akib Azmain Turja
2022-09-08 2:56 ` Richard Stallman
2022-09-08 7:16 ` Eli Zaretskii
2022-09-08 9:14 ` Gregory Heytings
2022-09-09 3:03 ` Richard Stallman
2022-09-09 7:30 ` Gregory Heytings
2022-09-09 8:10 ` Po Lu
2022-09-09 10:08 ` Emanuel Berg
2022-09-09 10:13 ` Gregory Heytings
2022-09-09 10:25 ` Emanuel Berg
2022-09-09 11:11 ` Eli Zaretskii
2022-09-09 11:04 ` Eli Zaretskii
2022-09-09 10:13 ` Emanuel Berg
2022-09-09 11:10 ` Eli Zaretskii
2022-09-09 10:52 ` Eli Zaretskii
2022-09-10 1:42 ` Emanuel Berg
2022-09-09 11:18 ` Gregory Heytings
2022-09-09 13:47 ` Po Lu
2022-09-09 14:08 ` Gregory Heytings
2022-09-10 15:09 ` Emanuel Berg
2022-09-09 14:15 ` Eli Zaretskii
2022-09-10 15:01 ` Emanuel Berg
2022-09-10 14:56 ` Emanuel Berg
2022-09-09 10:09 ` Emanuel Berg
2022-09-03 9:17 ` Yuri Khan
2022-09-03 9:28 ` Gregory Heytings
2022-09-03 9:36 ` Emanuel Berg
2022-09-03 9:31 ` Emanuel Berg
2022-09-03 9:40 ` Yuri Khan
2022-09-03 9:47 ` Emanuel Berg
2022-09-03 10:00 ` Emanuel Berg
2022-09-03 12:47 ` Akib Azmain Turja
2022-09-05 2:47 ` Emanuel Berg
2022-09-05 6:08 ` enum (was: Re: Display of undisplayable characters: \U01F3A8 instead of diamond) Emanuel Berg
2022-09-08 4:50 ` enum Emanuel Berg
2022-09-05 4:05 ` Display of undisplayable characters: \U01F3A8 instead of diamond Richard Stallman
2022-09-05 4:51 ` Emanuel Berg
2022-09-03 2:51 ` Richard Stallman
2022-09-02 7:28 ` Gregory Heytings
2022-09-02 11:12 ` Alan Mackenzie
2022-09-02 11:29 ` Eli Zaretskii
2022-09-02 13:39 ` Alan Mackenzie
2022-09-02 13:44 ` Gregory Heytings
2022-09-02 13:59 ` Eli Zaretskii
2022-09-02 16:12 ` Alan Mackenzie
2022-09-02 16:26 ` Eli Zaretskii
2022-09-03 5:27 ` Tomas Hlavaty
2022-09-03 8:15 ` Emanuel Berg
2022-09-03 8:29 ` Emanuel Berg
2022-09-05 4:05 ` Richard Stallman
2022-09-04 13:23 ` Andreas Schwab
2022-09-02 19:19 ` Gregory Heytings
2022-09-03 2:51 ` Richard Stallman
2022-09-03 6:44 ` Eli Zaretskii
2022-09-04 11:23 ` Alan Mackenzie
2022-09-04 13:01 ` Eli Zaretskii
2022-09-05 18:59 ` Alan Mackenzie
2022-09-06 4:15 ` Richard Stallman
2022-09-05 4:01 ` Richard Stallman
2022-09-05 4:05 ` Richard Stallman
2022-09-05 4:55 ` Emanuel Berg
2022-09-05 11:33 ` Eli Zaretskii
2022-09-06 4:20 ` Emanuel Berg
2022-09-06 10:01 ` Eli Zaretskii
2022-09-06 10:38 ` Emanuel Berg
2022-09-06 13:03 ` Eli Zaretskii
2022-09-07 1:03 ` Emanuel Berg
2022-09-07 2:37 ` Eli Zaretskii
2022-09-07 3:21 ` Emanuel Berg
2022-09-07 11:02 ` Eli Zaretskii
2022-09-07 13:12 ` Yuri Khan
2022-09-07 13:34 ` Eli Zaretskii
2022-09-07 13:58 ` Yuri Khan
2022-09-07 14:20 ` Eli Zaretskii
2022-09-07 15:48 ` Tomas Hlavaty
2022-09-07 16:48 ` Stefan Monnier
2022-09-07 17:02 ` Tomas Hlavaty
2022-09-08 12:26 ` Emanuel Berg
2022-09-07 18:03 ` Eli Zaretskii
2022-09-08 12:28 ` Emanuel Berg
2022-09-08 12:24 ` Emanuel Berg
2022-09-07 17:29 ` Yuri Khan
2022-09-07 18:32 ` Eli Zaretskii
2022-09-09 9:56 ` Emanuel Berg
2022-09-09 11:01 ` Eli Zaretskii
2022-09-10 4:41 ` Emanuel Berg
2022-09-10 6:33 ` Eli Zaretskii
2022-09-10 15:19 ` Emanuel Berg
2022-09-10 15:40 ` Eli Zaretskii
2022-09-10 15:55 ` Emanuel Berg
2022-09-10 17:18 ` Emanuel Berg
2022-09-20 1:09 ` Emanuel Berg
2022-09-08 12:29 ` Emanuel Berg
2022-09-08 12:14 ` Emanuel Berg
2022-09-08 2:12 ` Emanuel Berg
2022-09-08 1:32 ` Emanuel Berg
2022-09-08 6:17 ` Eli Zaretskii
2022-09-09 9:59 ` Emanuel Berg
2022-09-09 11:02 ` Eli Zaretskii
2022-09-10 6:49 ` Richard Stallman
2022-09-07 2:19 ` Richard Stallman
2022-09-07 13:21 ` Eli Zaretskii
2022-09-03 2:51 ` Richard Stallman
2022-09-03 3:09 ` Emanuel Berg
2022-09-03 6:36 ` Eli Zaretskii
2022-09-06 4:13 ` Richard Stallman
2022-09-06 4:18 ` Emanuel Berg
2022-09-08 2:56 ` Richard Stallman
2022-09-02 11:39 ` Gregory Heytings
2022-09-02 12:30 ` Eli Zaretskii
2022-09-02 12:44 ` Gregory Heytings
2022-09-02 13:14 ` Eli Zaretskii
2022-09-02 14:15 ` Gregory Heytings
2022-09-02 15:20 ` Eli Zaretskii
2022-09-02 15:27 ` Gregory Heytings
2022-09-02 15:34 ` Gregory Heytings
2022-09-02 15:45 ` Gregory Heytings
2022-09-02 16:06 ` Eli Zaretskii
2022-09-02 16:30 ` Eli Zaretskii
2022-09-02 16:37 ` Gregory Heytings
2022-09-02 16:55 ` Andreas Schwab
2022-09-02 16:56 ` Gregory Heytings
2022-09-02 18:19 ` Eli Zaretskii
2022-09-02 18:24 ` Eli Zaretskii
2022-09-02 19:13 ` Gregory Heytings
2022-09-02 16:03 ` Eli Zaretskii
2022-09-02 16:02 ` Eli Zaretskii
2022-09-02 13:13 ` Alan Mackenzie
2022-09-02 13:41 ` Gregory Heytings
2022-09-02 15:38 ` Alan Mackenzie
2022-09-02 16:00 ` Gregory Heytings
2022-09-02 16:32 ` Stefan Monnier
2022-09-02 16:55 ` Yuri Khan
2022-09-03 5:35 ` Tomas Hlavaty
2022-09-03 5:49 ` Jean Louis
2022-09-03 9:16 ` Emanuel Berg
2022-09-03 6:46 ` Gregory Heytings
2022-09-02 11:47 ` Akib Azmain Turja
2022-09-02 12:07 ` Gregory Heytings
2022-09-02 12:45 ` Eli Zaretskii
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