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 see the updated filter attached!

Le Sunday 27 November 2022 à 08:24:43AM, user account a écrit :
> Ok, gotcha! Could you point me to an example of how that page number could be
> printed somewhere?
> 
> My goal is this, HTML:
> <p>Here's text with <a href="/some-blog-post">anchor text</a>.</p>
> 
> Becomes a paragraph in the pdf document:
> Here's text with anchor text[1].
> 
> And then in the footer, is a footnote:
> 1) See <scripted caption> one page #7.
> 
> ...where page 7 is the where the /some-blog-post is now located in this pdf.
> 
> Does that make sense?
> 
> On Sunday, November 27, 2022 at 10:50:14 AM UTC-5 Bastien Dumont wrote:
> 
>     My filter only shows how one can inject raw code to get references by page
>     number in LaTeX. Without any example, I don't really understand what you
>     say about footnotes and so on, but the basic mechanism is here, now you can
>     adapt the filter to your needs.
> 
>     Le Sunday 27 November 2022 à 06:13:53AM, user account a écrit :
>     > oh a 'filters' subdir! Thanks. So now the pdf gets created w/o error, but
>     there
>     > are not footnotes.
>     >
>     > neither of these:
>     > pandoc -L links-with-page-number.lua -o test.pdf test.html
>     > pandoc -V links-as-notes -L links-with-page-number.lua -o test.pdf
>     > test.html
>     > ...creates pdf w/ footnotes, so there's no footnote to contain the page
>     number
>     > of the linked-to page.
>     >
>     > Something undesireable does happen though... I changed the paragraph with
>     the
>     > link to:
>     > <p>Here is a link to <a href="#thetarget">important words about the
>     target</a>.
>     > </p>
>     > ...and the "important words about the target" get removed altogether.
>     Those
>     > should not be removed, just the <a> tags around them should be removed.
>     >
>     > Thanks for the help so far. I'm excited to see a lua filter in action for
>     my
>     > first time. Very curious about the api... I presume pandoc is looking for
>     > functions with particular names like Link and Span? Would you mind
>     > confirming... this [1]https://pandoc.org/lua-filters.html#type-link is
>     the proper
>     > spot in the docs for referencing Link in this context... right?
>     >
>     > I imagine this working example produce footnotes w/ page numbers for you
>     in
>     > your environment...? Any idea what I could inspect to try to get it
>     working in
>     > mine?
>     > On Sunday, November 27, 2022 at 3:57:02 AM UTC-5 Bastien Dumont wrote:
>     >
>     > Place the file under `~/.local/share/pandoc/filters`. You don't need the
>     > executable flag.
>     >
>     > Le Saturday 26 November 2022 à 02:30:58PM, user account a écrit :
>     > > Thanks I wish that worked. I don't know what I'm doing wrong, here's
>     what
>     > I've
>     > > got…
>     > >
>     > > `pandoc --version` says user data dir is `~/.local/share/pandoc` so I
>     > placed
>     > > this file there as `~/.local/share/pandoc/links-with-page-number.lua`
>     and
>     > did
>     > > (just in case) `chmod +x` on it.
>     > >
>     > > `pandoc -o test.pdf test.html` produces a 2page pdf as expected with no
>     > > footnotes.
>     > >
>     > > `pandoc -L links-with-page-number.lua -o test.pdf test.html` fails to
>     > produce
>     > > pdf file with:
>     > > ```
>     > > Error running filter links-with-page-number.lua:
>     > > links-with-page-number.lua: openBinaryFile: does not exist (No such
>     file
>     > or
>     > > directory)
>     > > ```
>     > >
>     > > There's no typo in my script name or command invocation. Using ~
>     /.pandoc
>     > > instead of ~/.local/share/pandoc doesn't make any difference, still get
>     > that
>     > > same error.
>     > >
>     > > Any ideas?
>     > >
>     > > On Saturday, November 26, 2022 at 12:34:15 PM UTC-5 Bastien Dumont
>     wrote:
>     > >
>     > > 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][1][1]https://
>     > [2]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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>     > > > > [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>     > > > > [2] [4][4][4][5]https://groups.google.com/d/msgid/pandoc-discuss/
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>     > > > References:
>     > > >
>     > > > [1] [8][8][9]https://pandoc.org/
>     > > > [2] [9][9][10]https://groups.google.com/d/msgid/
>     > > > [3] [10][10][11]http://40googlegroups.com/
>     > > > [4] [11][11][12]https://groups.google.com/d/msgid/pandoc-discuss/
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>     > >
>     > > References:
>     > >
>     > > [1] [17][18]https://pandoc.org/
>     > > [2] [18][19]https://groups.google.com/
>     > > [3] [19][20]http://40googlegroups.com/
>     > > [4] [20][21]https://groups.google.com/d/msgid/pandoc-discuss/
>     > > [5] [21][22]http://40googlegroups.com/?utm_medium=email&
>     > > [6] [22][23]https://groups.google.com/d/msgid/
>     > > [7] [23][24]http://40googlegroups.com/
>     > > [8] [24][25]https://pandoc.org/
>     > > [9] [25][26]https://groups.google.com/d/msgid/
>     > > [10] [26][27]http://40googlegroups.com/
>     > > [11] [27][28]https://groups.google.com/d/msgid/pandoc-discuss/
>     > a93afb43-c939-40c1-868f-1db8eded17d8n%[29]40googlegroups.com?utm_medium=
>     email&
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>     > > [12] [28][30]https://groups.google.com/d/msgid/pandoc-discuss/
>     > 2aec84ad-a750-48f2-a0c2-ad7572dcca11n%[31]40googlegroups.com?utm_medium=
>     email&
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>     > > [13] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>     > > [14] [29][32]https://groups.google.com/d/msgid/pandoc-discuss/
>     > 480d0274-2324-43d7-9f74-1bbfc08fcbd0n%[33]40googlegroups.com?utm_medium=
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>     > References:
>     >
>     > [1] [36]https://pandoc.org/
>     > [2] [37]http://groups.google.com/
>     > [3] [38]http://40googlegroups.com/
>     > [4] [39]https://groups.google.com/d/msgid/pandoc-discuss/
>     > [5] [40]http://40googlegroups.com/?utm_medium=
>     > [6] [41]https://groups.google.com/
>     > [7] [42]http://40googlegroups.com/
>     > [8] [43]https://pandoc.org/
>     > [9] [44]https://groups.google.com/d/msgid/
>     > [10] [45]http://40googlegroups.com/
>     > [11] [46]https://groups.google.com/d/msgid/pandoc-discuss/
>     > [12] [47]http://40googlegroups.com/?utm_medium=email&
>     > [13] [48]https://groups.google.com/d/msgid/pandoc-discuss/
>     > [14] [49]http://40googlegroups.com/?utm_medium=email&
>     > [15] [50]https://groups.google.com/d/msgid/
>     > [16] [51]http://40googlegroups.com/
>     > [17] [52]https://pandoc.org/
>     > [18] [53]https://groups.google.com/
>     > [19] [54]http://40googlegroups.com/
>     > [20] [55]https://groups.google.com/d/msgid/pandoc-discuss/
>     > [21] [56]http://40googlegroups.com/?utm_medium=email&
>     > [22] [57]https://groups.google.com/d/msgid/
>     > [23] [58]http://40googlegroups.com/
>     > [24] [59]https://pandoc.org/
>     > [25] [60]https://groups.google.com/d/msgid/
>     > [26] [61]http://40googlegroups.com/
>     > [27] [62]https://groups.google.com/d/msgid/pandoc-discuss/
>     a93afb43-c939-40c1-868f-1db8eded17d8n%40googlegroups.com?utm_medium=email&
>     utm_source=footer
>     > [28] [63]https://groups.google.com/d/msgid/pandoc-discuss/
>     2aec84ad-a750-48f2-a0c2-ad7572dcca11n%40googlegroups.com?utm_medium=email&
>     utm_source=footer
>     > [29] [64]https://groups.google.com/d/msgid/pandoc-discuss/
>     480d0274-2324-43d7-9f74-1bbfc08fcbd0n%40googlegroups.com?utm_medium=email&
>     utm_source=footer
>     > [30] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>     > [31] [65]https://groups.google.com/d/msgid/pandoc-discuss/
>     e969f1ca-c6bf-4a5e-b53f-86aa0a444db2n%40googlegroups.com?utm_medium=email&
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> References:
> 
> [1] https://pandoc.org/lua-filters.html#type-link
> [2] http://pandoc.org/
> [3] http://groups.google.com/
> [4] http://40googlegroups.com/
> [5] https://groups.google.com/d/msgid/pandoc-discuss/
> [6] http://40googlegroups.com/
> [7] http://groups.google.com/
> [8] http://40googlegroups.com/
> [9] https://pandoc.org/
> [10] https://groups.google.com/d/msgid/
> [11] http://40googlegroups.com/
> [12] https://groups.google.com/d/msgid/pandoc-discuss/
> [13] http://40googlegroups.com/?utm_medium=
> [14] https://groups.google.com/d/msgid/pandoc-discuss/
> [15] http://40googlegroups.com/?utm_medium=
> [16] http://groups.google.com/d/msgid/
> [17] http://40googlegroups.com/
> [18] https://pandoc.org/
> [19] https://groups.google.com/
> [20] http://40googlegroups.com/
> [21] https://groups.google.com/d/msgid/pandoc-discuss/
> [22] http://40googlegroups.com/?utm_medium=email&
> [23] https://groups.google.com/d/msgid/
> [24] http://40googlegroups.com/
> [25] https://pandoc.org/
> [26] https://groups.google.com/d/msgid/
> [27] http://40googlegroups.com/
> [28] https://groups.google.com/d/msgid/pandoc-discuss/
> [29] http://40googlegroups.com/?utm_medium=email&
> [30] https://groups.google.com/d/msgid/pandoc-discuss/
> [31] http://40googlegroups.com/?utm_medium=email&
> [32] https://groups.google.com/d/msgid/pandoc-discuss/
> [33] http://40googlegroups.com/?utm_medium=email&
> [34] https://groups.google.com/d/msgid/
> [35] http://40googlegroups.com/
> [36] https://pandoc.org/
> [37] http://groups.google.com/
> [38] http://40googlegroups.com/
> [39] https://groups.google.com/d/msgid/pandoc-discuss/
> [40] http://40googlegroups.com/?utm_medium=
> [41] https://groups.google.com/
> [42] http://40googlegroups.com/
> [43] https://pandoc.org/
> [44] https://groups.google.com/d/msgid/
> [45] http://40googlegroups.com/
> [46] https://groups.google.com/d/msgid/pandoc-discuss/
> [47] http://40googlegroups.com/?utm_medium=email&
> [48] https://groups.google.com/d/msgid/pandoc-discuss/
> [49] http://40googlegroups.com/?utm_medium=email&
> [50] https://groups.google.com/d/msgid/
> [51] http://40googlegroups.com/
> [52] https://pandoc.org/
> [53] https://groups.google.com/
> [54] http://40googlegroups.com/
> [55] https://groups.google.com/d/msgid/pandoc-discuss/
> [56] http://40googlegroups.com/?utm_medium=email&
> [57] https://groups.google.com/d/msgid/
> [58] http://40googlegroups.com/
> [59] https://pandoc.org/
> [60] https://groups.google.com/d/msgid/
> [61] http://40googlegroups.com/
> [62] https://groups.google.com/d/msgid/pandoc-discuss/a93afb43-c939-40c1-868f-1db8eded17d8n%40googlegroups.com?utm_medium=email&utm_source=footer
> [63] https://groups.google.com/d/msgid/pandoc-discuss/2aec84ad-a750-48f2-a0c2-ad7572dcca11n%40googlegroups.com?utm_medium=email&utm_source=footer
> [64] https://groups.google.com/d/msgid/pandoc-discuss/480d0274-2324-43d7-9f74-1bbfc08fcbd0n%40googlegroups.com?utm_medium=email&utm_source=footer
> [65] https://groups.google.com/d/msgid/pandoc-discuss/e969f1ca-c6bf-4a5e-b53f-86aa0a444db2n%40googlegroups.com?utm_medium=email&utm_source=footer
> [66] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> [67] https://groups.google.com/d/msgid/pandoc-discuss/858c5a07-89a0-4daa-803f-e0d9d50ca9c6n%40googlegroups.com?utm_medium=email&utm_source=footer

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[-- Attachment #2: links-with-page-number.lua --]
[-- Type: text/plain, Size: 584 bytes --]

function Link(link)
  local target = link.target
  if string.sub(target, 1, 1) == '#' then
    local label = string.sub(target, 2)
    local ref_by_page = pandoc.RawInline('latex', 'page \\#\\pageref{' .. label .. '}')
    local note_content = pandoc.Para({pandoc.Str('See on '), ref_by_page, pandoc.Str('.')})
    local footnote = pandoc.Note(note_content)
    link.content:insert(footnote)
    return link.content
  end
end

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