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Re: generic color support for `texinfo.tex`

From: Patrice Dumas
Subject: Re: generic color support for `texinfo.tex`
Date: Mon, 20 Dec 2021 19:54:43 +0100

On Mon, Dec 20, 2021 at 05:17:46PM +0100, Jean Abou Samra wrote:
> Le 20/12/2021 à 17:01, Patrice Dumas a écrit :
> > On Wed, Nov 24, 2021 at 03:17:22PM +0000, Werner LEMBERG wrote:
> > > Hello Gavin,
> > > 
> > > 
> > > For the LilyPond documentation we are going to use `pygments` to do
> > > automatic colour highlighting of LilyPond snippets.  We also want to
> > > support this feature in the PDF manuals.  To do so I ask you to apply
> > > something like the following patch to make `@setcolor` work in
> > > `@example` environments, too.
> > I don't know if it is relevant or not, but, for HTML, there is an init
> > file, tp/init/highligh_syntax.pm that uses source-highlight to highlight
> > @example blocks based on the language argument.
> Thanks for the heads-up, I didn't know about that.
> Unfortunately, it will not work for us, for several
> reasons: first, we are still using texi2html, not
> makeinfo (and even the decade-old texi2html 1.82!),

That's indeed an issue...

> and second, the highlighting is done by Pygments,
> not by source-highlight. 

If it is possible to do something similar with Pygments than with 
it could easily be used as a replacement.  I do not know Pygments, some
functionalities from source-highlight that could be absent from Pygments
are a way to select fragments to be highlighted, as done with
source-highlight --line-range option, and also something that could be
unavailable could be something similar with source-highlight
--range-separator option which is also used to be able to easily get the
highlighted fragments.  However if those two functionalities are
present, it should probably be pretty easy to be able to use Pygments


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