Re: Curses doesn't display octants

[Thomas Dickey]

On Sun, Dec 15, 2024 at 10:51:26AM +0200, Ram Rachum wrote:
> On Sun, Dec 15, 2024 at 1:34 AM Thomas Dickey <dickey@his.com> wrote:
> 
> > On Wed, Dec 11, 2024 at 10:41:01AM +0200, Ram Rachum wrote:
> > > Hello curses maintainers,
> > >
> > > I think that curses may have a bug which causes it to not be able to
> > > display octant characters correctly. Instead it displays blank space:
> > >
> > > [image: 394317958-959e0486-d8ac-4279-9896-bd8eb1ab01d4.png]
> > >
> > > Please see this bug report to CPython:
> > > https://github.com/python/cpython/issues/127795
> >
> > There's not enough information in the bug report.  If your system's
> > runtime (e.g., glibc) does not yet support the wcwidth data for those
> > characters, ncurses will show them as blanks.
> >
> > (the font and terminal used are only one part - some terminals use
> > hardcoded behavior, while ncurses uses the system's locale information).
> >
> > > See especially the message by midichef in that issue that gives more
> > > context and shows that the problem might be with the `ncurses` library.
> >
> > no, that only eliminates the python script from discussion
> >
> > --
> > Thomas E. Dickey <dickey@invisible-island.net>
> > https://invisible-island.net
> 
> 
>   I'd like to get you the information you need for this. Does the below
> help? If not please tell me which commands to run to get you that
> information.
> 
> ➜  ~ dpkg -l | grep -E 'ncurses|glibc'
> ii  libncurses6:amd64               6.4+20240113-1ubuntu2
> amd64        shared libraries for terminal handling
> ii  libncursesw6:amd64              6.4+20240113-1ubuntu2
> amd64        shared libraries for terminal handling (wide character support)
> ii  ncurses-base                    6.4+20240113-1ubuntu2
> all          basic terminal type definitions
> ii  ncurses-bin                     6.4+20240113-1ubuntu2
> amd64        terminal-related programs and man pages
> ii  ncurses-term                    6.4+20240113-1ubuntu2
> all          additional terminal type definitions
> ➜  ~ locale
> LANG=C.UTF-8
> LANGUAGE=
> LC_CTYPE="C.UTF-8"
> LC_NUMERIC="C.UTF-8"
> LC_TIME="C.UTF-8"
> LC_COLLATE="C.UTF-8"
> LC_MONETARY="C.UTF-8"
> LC_MESSAGES="C.UTF-8"
> LC_PAPER="C.UTF-8"
> LC_NAME="C.UTF-8"
> LC_ADDRESS="C.UTF-8"
> LC_TELEPHONE="C.UTF-8"
> LC_MEASUREMENT="C.UTF-8"
> LC_IDENTIFICATION="C.UTF-8"
> LC_ALL=
> ➜  ~ ldd --version
> ldd (Ubuntu GLIBC 2.39-0ubuntu8.3) 2.39

glibc 2.39 has data for Unicode 15.1.0 - 

https://lists.gnu.org/archive/html/info-gnu/2024-01/msg00017.html

The bug report says that the characters were introduced in Unicode 16.0

Terminals may/may not display those characters without locale information
because the font itself provides some -- often inconsistent -- data.

> Copyright (C) 2024 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> Written by Roland McGrath and Ulrich Drepper.
> ➜  ~ getconf GNU_LIBC_VERSION
> glibc 2.39

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net

signature.asc
Description: PGP signature