Thanks! Yeah injecting html in the intermediary document doesn't sound very 
promising either (again, because the pages have to be built first before 
footnotes updated with page #s) so maybe I'll abandon weasyprint in this 
case, if this would be easy to do with a *Tex pdf engine. In that case... 
how would one go about this? Would a lua filter be more capable with a 
different pdf engine or would a different mechanism be used?

On Saturday, November 26, 2022 at 5:28:31 AM UTC-5 Bastien Dumont wrote:

> The problem is that Pandoc does not produce the PDF document: it produces 
> the intermediary HTML document that is processed by weasyprint to produce 
> the PDF. So you cannot get page numbers in a Lua filter.
>
> However, you can inject raw HTML code in the intermediary file (or in your 
> CSS) that will make weasyprint print the page numbers. The question is 
> whether such HTML code exists. It certainly would be possible to do this if 
> you converted to PDF via LaTeX, ConTeXt or groff, but I don't know if it is 
> possible via weasyprint.
>
> Le Friday 25 November 2022 à 04:33:05PM, user account a écrit :
> > Using pandoc with weasyprint pdf engine to turn the markdown files from 
> a blog
> > (static site generator does the html conversion) into a pdf for print.
> > 
> > Would it be possible, perhaps with a custom lua filter or some other 
> mechanism,
> > to add the page number of the linked-to page? The page numbers won't be 
> known
> > until pandoc has already created the document, and I don't know where in 
> 'the
> > pipeline' the lua filter intervenes compared to when the pages exist...? 
> And
> > If the pages exist with their numbers earlier enough, is there an object 
> or
> > something from which lua can get the page number?
> > 
> > I haven't found anything about page numbers in https://pandoc.org/
> > lua-filters.html#module-pandoc.utils ...am I looking in the wrong place? 
> Can
> > anyone tell me anything about this?
> > 
> > It's an intimidating rabbit hole for me, particularly because I see no 
> mention
> > of "page number" there in the docs, which makes it seem kinda hopeless
> > actually. But maybe one of you know the way and could point me in that
> > direction?
> > 
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