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

[Philip Kaludercic <philipk@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Cc: me@eshelyaron.com,  73425@debbugs.gnu.org, "Stefan Monnier"
>>  <monnier@iro.umontreal.ca>
>> Date: Mon, 23 Sep 2024 10:48:41 +0000
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > 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).
>> 
>> Right, and we can facilitate this by allowing package specifications to
>> annotate where images are found.
>> 
>> > How do we generate these HTML files from the Texinfo sources?
>> 
>> Basically by executing,
>> 
>> --8<---------------cut here---------------start------------->8---
>> makeinfo --no-split [input-name] -o [output-name] --html --css-ref=[css-url]
>> --8<---------------cut here---------------end--------------->8---
>> 
>> >> 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?
>> 
>> I am not sure, my suspicion is some kind of historical backwards
>> compatibility.  I have CC'ed Stefan who might know more.
>> 
>> > In any case, what I propose is to have the image files right near the
>> > HTML files which reference them.
>> 
>> That would make sense.
>
> OK, so we agree.  I guess what's left is to somehow make sure this all
> does indeed happen?

Yes.  My suggestion is to allow listing additional non-.texi/.org files
under :doc that would be copied out to the web server.  So in Eshel's
case, we could update the specification to be

 (kubed			:url "https://git.sr.ht/~eshel/kubed"
  :doc ("kubed.texi" "images/"))

and the HTTP server could host all files under images/.

>> >> >> 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?
>> 
>> Some kind of --embed flag, that would inline images.  So instead of
>> generating
>> 
>>   <img src="/path/to/image.png" />
>> 
>> makeinfo could produce
>> 
>>   <img src="data:image/png;base64,iVBORw0KGgoAAAANS..."
>
> Ah, apologies for my misunderstanding.  No, such inlining is not
> supported by Texinfo for HTML, AFAIK, they only support external image
> files for HTML.  (DVI and PDF outputs do embed the image, I believe.)

What about the Info viewer in Emacs?

-- 
	Philip Kaludercic on siskin