[Groff] Re: colors (was: snprintf)

[Gaius Mulley]

Werner writes:

> The question is whether these commands should be implemented as
> primitives or via the \X interface.

> Comments, please.

I'd favour introducing a new troff escape sequence for glyph colours.
Say \G[glyphcolour,pagecolour] and \G[glyphcolour]
and \GP which returns to the previous colour combination.

We'd then need to add a command to the ditroff repertoire
x G glyphcolour,pagecolour

and, gulp, modify grops and family (someone..)

The preprocessor, tbl might be altered to include a new column command
g,G using same syntax as the w,W minimum width specifier.
Tbl could also have a colour commands in the table descriptions section:

   color(glyphcolour,pagecolour), and maybe a framecolor(glyphcolour)

[w.r.t grohtml tbl would emit html markers]

PIC could be extended to fill using colours. The grey shade option
could be extended to recognise page colour, perhaps using the syntax
mentioned by Werner.

likewise comments please,

Gaius