bug#73425: 31.0.50; Support images in HTML versions of ELPA package manuals

[Eli Zaretskii <eliz@gnu.org>]

> From: Philip Kaludercic <philipk@posteo.net>
> Cc: me@eshelyaron.com,  73425@debbugs.gnu.org
> Date: Sun, 22 Sep 2024 18:23:38 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> What we need is some kind of an indication in the package specification,
> >> what files should be copied out for the manual to access, as otherwise
> >> the images would only be hidden in the package tarball, that a web
> >> browser cannot access (AFAIK).
> >
> > "Copied" where and why?  Aren't the HTML docs generated in the
> > package's tree, like the Info docs?
> 
> No, these are the files we generate for a package under
> https://elpa.gnu.org/packages:
> 
>   -rw-r--r--  1 phi phi 368640 Mar 22  2024 compat-29.1.4.5.tar
>   -rw-r--r--  1 phi phi  11183 Mar 22  2024 compat.html
>   -rw-r--r--  1 phi phi    997 Mar 22  2024 compat-readme.txt
>   -rw-r--r--  1 phi phi   1230 Mar 22  2024 compat.svg
>   lrwxrwxrwx  1 phi phi     19 Mar 22  2024 compat.tar -> compat-29.1.4.5.tar
>   -rw-r--r--  1 phi phi   1016 Mar 22  2024 compat.xml

Then the image files should be in the same directory (or in its
images/ subdirectory, but that would need to be coordinated with the
package developers).

How do we generate these HTML files from the Texinfo sources?

> plus the manual under https://elpa.gnu.org/packages/doc/[package name]

So we have the HTML docs in two places?  Why two?  And why do I see
both https://elpa.gnu.org/packages/doc/compat.html and
https://elpa.gnu.org/packages/doc/compat/compat.html?

In any case, what I propose is to have the image files right near the
HTML files which reference them.

> >> Do you know if TeXinfo has an option to inline images?  If the
> >> "makeinfo" command could somehow generate data: urls when exporting
> >> images, then this could be very easily solved.
> >
> > This is already supported, for a long time, both in Info and HTML
> > formats (and in other formats as well; see the node "Image Syntax" in
> > the Texinfo manual.
> 
> I did take a look at that node, but I couldn't find anything that would
> help me.

??? What are you looking for that is not there?