Re: addition to GREP_COLORS documentation

[Charles Levert]

[ To bug-grep readers:  This was sent to me by private email.  I am
       citing it whole here as I don't believe any of it is secret.  ]

* On Sunday 2005-11-13 at 22:21:29 -0800, Dan Nicolaescu wrote:
> Hi!
> 
> May I suggest an addition to the GREP_COLORS documentation?
> 
> Currently the GREP_COLORS support works just fine on terminals capable
> of displaying 256 colors. It would be nice to have some documentation
> about this. 

This really belongs in each specific terminal's
documentation, such as xterm's ctlseqs.ms.

However, I have added something about this you
might like.  See my latest posts in the
"[patch] selected/context colors" thread of the
bug-grep mailing list.  The current CVS revision
of "grep.texi", which is older, simply used to
refer the reader to the terminal's documentation
about SGR ("\33[m").


> For example something like: 
> The GREP_COLORS support can be used on terminals that support 256
> colors. For example specifying mt=48;5;40;38;5;190 means to display
> the match with as a background the color 40 and as a foreground the
> color 190. 
> 
> I am not sure if there any documentation for the 256 colors used by
> xterm. The script 256colors2.pl in the xterm distribution can be used
> to display all the 256 colors.

In <ftp://invisible-island.net/xterm/xterm-207.tgz>,
file "xterm-207/ctlseqs.ms":

   If 88- or 256-color support is compiled, the following apply.
     \*(Ps = \*3\*8 ; \*5 ; \*(Ps \(-> Set foreground color to the second \*(Ps
     \*(Ps = \*4\*8 ; \*5 ; \*(Ps \(-> Set background color to the second \*(Ps

Use

   groff -Tascii -ms xterm-207/ctlseqs.ms | less -sR
   groff -Tps    -ms xterm-207/ctlseqs.ms | gv -

to view this in its rendered forms.


> IMHO GREP_COLORS on a 256 colors terminal can be used to display some
> very attractive grep results. 
> 
> Thanks
> 
>         --dan