Re: converting links to footnotes... including page number in footnote??

[Bastien DUMONT <bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org>]

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Please find attached a basic implementation. As in the attached sample HMTL file, I suppose that the targets are marked with ids on spans and that you link to it via empty <a> elements. If you have a LaTeX installation, simply do `pandoc -L links-with-page-number.lua -o test.pdf test.html` to see the result.

Le Saturday 26 November 2022 à 05:21:25AM, user account a écrit :
> 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 [1]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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[-- Attachment #2: links-with-page-number.lua --]
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function Link(link)
  local target = link.target
  if string.sub(target, 1, 1) == '#' then
    local label = string.sub(target, 2)
    link.content=pandoc.RawInline('latex', 'p.~\\pageref{' .. label .. '}')
  end
  return link
end

function Span(span)
  local id = span.identifier
  if span.identifier then
    return { pandoc.RawInline('latex', '\\label{' .. id .. '}'), span }
  end
end

[-- Attachment #3: test.html --]
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