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bug#26396: 25.1; char-displayable-p on a latin1 tty
From: |
Eli Zaretskii |
Subject: |
bug#26396: 25.1; char-displayable-p on a latin1 tty |
Date: |
Thu, 13 Apr 2017 10:16:21 +0300 |
> Cc: 26396@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Wed, 12 Apr 2017 23:19:53 -0700
>
> Eli Zaretskii wrote:
> > I think the code in
> > char-displayable-p which looks at the result of internal-char-font
> > should only accept a non-negative value if the terminal-coding-system
> > supports the character. IOW, the Linux console should not be
> > considered as being able to display a character unless the terminal
> > encoding can safely encode it.
>
> Wouldn't it be better if Emacs ignored terminal-coding-system when the output
> device is a Linux console and Emacs therefore knows exactly which characters
> the
> console can display? Instead, Emacs could simply display those characters
> as-is.
Yes, that would be better. But it's probably a non-trivial project,
since we'd need separate code to determine double-width glyphs,
padding glyphs, and perhaps also something special for composed
characters. Does the Linux console allow us to figure out all of
that?
And what does "display as-is" means in practice? Should we send to
the console the glyph codes corresponding to Unicode points, or should
we send UTF-8 encoded characters? (Is there some document which
describes these features in enough detail for us to figure out their
implications on Emacs display code?)
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Kevin Ryde, 2017/04/07
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/08
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Kevin Ryde, 2017/04/09
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/10
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/10
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/10
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/13
- bug#26396: 25.1; char-displayable-p on a latin1 tty,
Eli Zaretskii <=
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/13
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Kevin Ryde, 2017/04/13
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/14
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/14
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/14
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/15
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/15
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/16
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Paul Eggert, 2017/04/16
- bug#26396: 25.1; char-displayable-p on a latin1 tty, Eli Zaretskii, 2017/04/17