From: Eli Zaretskii <eliz@gnu.org>
To: Visuwesh <visuweshm@gmail.com>
Cc: luangruo@yahoo.com, adam@alphapapa.net, 55623@debbugs.gnu.org
Subject: bug#55623: 29.0.50; Mention that (face-foreground 'default) can return "unspecified-fg"
Date: Wed, 25 May 2022 20:07:24 +0300 [thread overview]
Message-ID: <83tu9dpmlv.fsf@gnu.org> (raw)
In-Reply-To: <878rqpbqxm.fsf@gmail.com> (message from Visuwesh on Wed, 25 May 2022 20:27:41 +0530)
> From: Visuwesh <visuweshm@gmail.com>
> Cc: luangruo@yahoo.com, 55623@debbugs.gnu.org, adam@alphapapa.net
> Date: Wed, 25 May 2022 20:27:41 +0530
>
> > They aren't documented on purpose: documenting them would be messy and
> > at best will confuse anyone who isn't familiar with the internals of
> > color support on TTY frames. They are in effect internal
> > implementation details which unfortunately leak outside of the
> > internals.
> >
>
> I agree but I think anyone who is fairly familiar with terminal
> emulators can understand that you cannot find the terminal emulator's
> colourscheme (for a lack of a better word) in a terminal-agnostic way.
> Thus, I believe there won't be too much confusion if we added such a
> text.
Which "such text" did you have in mind? The problem here is to come
up with a useful text, which explains something without raising a lot
more questions.
> > What would you like to be documented about these special values, and
> > why?
>
> I would like it if some words along the lines of...
>
> The 'default' face is always fully specified except in special cases
> of TTY frames where :foreground and :background attributes may be
> the strings "unspecified-fg" and "unspecified-bg" respectively.
Without explaining the reason for these strange "color names", how can
this be useful to anyone?
> As for the why: In the bug report I alluded to in the OP, ement.el
> relied on the completeness of the default-face specification to get the
> colour of the face which is then used to calculate a different colour
> (similar to the rainbow coloured nicknames you often see in irc
> clients). This special case of the TTY frame would be handled correctly
> if it was spelt out somewhere. (It isn't now since the value returned is
> a surprise.)
In such rare cases, it is much easier to explain the issue to a person
who needs to deal with it (or thinks he/she needs to) than come up
with a description useful enough to be in the manual.
They are just "special color names", that's all.
next prev parent reply other threads:[~2022-05-25 17:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 5:39 bug#55623: 29.0.50; Mention that (face-foreground 'default) can return "unspecified-fg" Visuwesh
2022-05-25 7:17 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-25 7:53 ` Visuwesh
2022-05-25 13:18 ` Eli Zaretskii
2022-05-25 14:57 ` Visuwesh
2022-05-25 17:07 ` Eli Zaretskii [this message]
2022-05-25 17:22 ` Visuwesh
2022-05-25 17:37 ` Eli Zaretskii
2022-05-27 5:44 ` Adam Porter
2022-05-27 6:34 ` Eli Zaretskii
2022-05-27 7:27 ` Adam Porter
2022-06-28 21:37 ` Stefan Kangas
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