Re: Support for XTerm's 256-color extension?

Re: Support for XTerm's 256-color extension?

[Dan Nicolaescu]

stktrc <stktrc@yahoo.com> writes:

  > Has support for XTerm's 256-color extension been implemented?

Yes, I has been, it is working, and available in CVS.

Re: Support for XTerm's 256-color extension?

[Eli Zaretskii]

> From: stktrc <stktrc@yahoo.com>
> Date: 05 May 2004 00:34:35 +0300
> 
> Can't seem to get bold working together with 256-colors inside Emacs
> though.

Does it work with the 8-color xterm?

Emacs decides whether text attributes, such as bold, can be used
together with color by looking at the termcap/terminfo entry for the
terminal.  The "NC" capability there tells Emacs which combinations
are allowed; see the definition of `enum no_color_bit' near line 285
of term.c in the Emacs source tree for more details.

What is the value of "NC" for the 256-color xterm on your system?

Re: Support for XTerm's 256-color extension?

[Eli Zaretskii]

> From: stktrc <stktrc@yahoo.com>
> Date: 05 May 2004 21:43:49 +0300
> 
> > What is the value of "NC" for the 256-color xterm on your system?
> 
> I found out it was 32 (disable bold), which was the cause for not
> getting bold, i.e., you were on the right track.
> 
> Looking at the definition of xterm-256color in the terminfo file in
> xterm-187, there is ncv#32.  There is a comment before the definition
> that seems to provide some information on why ncv is 32, but I do not
> understand it fully.  See below.
> 
> #
> # OPT_PC_MODE should be settable with OSC, and the init for this
> # should turn it off; then ncv could be 0.
> # This uses RGB values 0..1000
> xterm-256color|xterm with 256 colors,
>         ccc,
>         colors#256,
>         ncv#32,
> [rest, not as interesting, left out]
> 
> I made a custom terminfo entry that extends xterm-256color with ncv#0,
> so that bold now works.
> 
> Should this really be necessary?

It shouldn't, but I'm guessing that whoever wrote that entry had
his/her reasons.

I'm CC'ing T. Dickey in the hope that he could help us understand this
issue.

Re: Support for XTerm's 256-color extension?

[Thomas Dickey]

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On Thu, May 06, 2004 at 08:39:45AM +0200, Eli Zaretskii wrote:
> > From: stktrc <stktrc@yahoo.com>
> > Date: 05 May 2004 21:43:49 +0300
> > 
> > > What is the value of "NC" for the 256-color xterm on your system?
> > 
> > I found out it was 32 (disable bold), which was the cause for not
> > getting bold, i.e., you were on the right track.
> > 
> > Looking at the definition of xterm-256color in the terminfo file in
> > xterm-187, there is ncv#32.  There is a comment before the definition
> > that seems to provide some information on why ncv is 32, but I do not
> > understand it fully.  See below.
> > 
> > #
> > # OPT_PC_MODE should be settable with OSC, and the init for this
> > # should turn it off; then ncv could be 0.
> > # This uses RGB values 0..1000
> > xterm-256color|xterm with 256 colors,
> >         ccc,
> >         colors#256,
> >         ncv#32,
> > [rest, not as interesting, left out]
> > 
> > I made a custom terminfo entry that extends xterm-256color with ncv#0,
> > so that bold now works.
> > 
> > Should this really be necessary?
> 
> It shouldn't, but I'm guessing that whoever wrote that entry had
> his/her reasons.
> 
> I'm CC'ing T. Dickey in the hope that he could help us understand this
> issue.

OPT_PC_MODE refers to the optional mapping of bold as brighter colors.
If he doesn't want/need that, then it doesn't matter.

-- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

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