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Re: RFC: comint.el - comint-highlight-prompt and unreadable colors

From: Dan Nicolaescu
Subject: Re: RFC: comint.el - comint-highlight-prompt and unreadable colors
Date: 2007年3月26日 09:24:37 -0700 
Miles Bader <address@hidden> writes:
 > Jari Aalto <address@hidden> writes:
 > > Have a look at these:
 > >
 > > 1) On Windows, terminal Putty, which is very popular free SSH terminal.
 > >
 > > http://cante.net/~jaalto/tmp/bug/emacs/m-x-shell-color--win32-putty.jpg
 > ...
 > > 2) On windows, displaying a rxvt terminal back to the Cygwin X11 server
 > > from a Unix host using "-bg black -fg snow"
 > >
 > > 
http://cante.net/~jaalto/tmp/bug/emacs/m-x-shell-color--rxvt-cygwin-X11.jpg
 > 
 > In both cases it looks like Emacs doesn't realize that it's on a
 > dark-background terminal, and is using light-background mode (which
 > indeed defaults to a darkish blue for comint prompts).
 > 
 > This is a common problem, because Emacs generally _cannot_ tell the
 > background color on a terminal, so it has to guess; I don't know about
 > windows, but on X11 it defaults to assuming dark-background on terminals
 > unless the TERM environment variable is "xterm". If TERM = "xterm",
 > Emacs assumes a light background.
 > 
 > Since rxvt sets TERM to "xterms", that's almost certainly what's
 > happening in the 2nd case. On windows, I don't know, but it's probably
 > a similar problem.
If the term is rxvt, then it's not a good idea to set TERM to xterms.
With "xterms" no term/*.el terminal initialization file is run!
rxvt sets the variable COLORFGBG to show the default foreground and
background. Based on COLORFGBG that term/rxvt.el can determine the
default background color, and correctly decide if the background is
light or dark.
Unfortunately other terminals do not have such a feature...
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