Re: Lua filter for section numbers in internal references

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

Have you looked at this? https://pandoc.org/lua-filters.html#type-div

Le Wednesday 22 December 2021 à 04:12:29AM, be...-GbY3e145aRm8w6eVIr4Tmg@public.gmane.org a écrit :
> Thanks for your ideas. I had considered pandoc-crossref also but didn't want to
> introduce a new dependency without a real need. If it can be accomplished using
> a simple and small Lua filter, I would prefer this.
> 
> I also observed that the native output creates a normal string. However, using
> Pandoc's make_section function, the references are delivered as DIVs with a
> number attribute. This is easy to process. I just need access to the text
> string inside the square brackets. So, how to access the text within a DIV? I
> think this is the thing I need to know ...
> 
> On Wednesday, December 22, 2021 at 12:13:38 PM UTC+1 Bastien Dumont wrote:
> 
>     It seems that you can use pandoc-crossref for such case: see the manual
>     here ([1]https://github.com/lierdakil/pandoc-crossref/blob/master/docs/
>     index.md).
> 
>     To answer the technical part of the question, `pandoc -t native <<< 'See
>     the [Quick introduction].'` shows that "[Quick introduction]" is parsed as
>     a normal string. You can create a span instead by adding a class: [Quick
>     introduction]{.sectionref}. But even then, it will be simplier to parse its
>     content if it is limited to one string (like "Quick-introduction").
> 
>     Le Wednesday 22 December 2021 à 01:16:01AM, be...@typoscriptics.de a écrit
>     :
>     > Hi,
>     >
>     > I am trying to make a Lua filter that will replace the normal link text
>     in
>     > internal links with section numbers. I want to use internal links in my
>     > markdown document like this:
>     >
>     > See the [Quick introduction].
>     >
>     > So, the links are given by the full title of the respective section they
>     refer
>     > to. I found a recipe at stackoverflow ([2]https://stackoverflow.com/
>     questions/
>     > 54128461/how-to-use-latex-section-numbers-in-pandoc-cross-reference)
>     which does
>     > this if the link is given like this:
>     >
>     > See the [](#quick-introduction)
>     >
>     > This is the Lua code:
>     >
>     > local make_sections = (require 'pandoc.utils').make_sections
>     > local section_numbers = {}
>     >
>     > function populate_section_numbers (doc)
>     > function populate (elements)
>     > for _, el in pairs(elements) do
>     > if el.t == 'Div' and el.attributes.number then
>     > section_numbers['#' .. el.attr.identifier] = el.attributes.number
>     > populate(el.content)
>     > end
>     > end
>     > end
>     > populate(make_sections(true, nil, doc.blocks))
>     > end
>     >
>     > function resolve_section_ref (link)
>     > if #link.content > 0 or link.target:sub(1, 1) ~= '#' then
>     > return nil
>     > end
>     > local section_number = pandoc.Str(section_numbers[link.target])
>     > return pandoc.Link({section_number}, link.target, link.title, link.attr)
>     > end
>     >
>     > return {
>     > {Pandoc = populate_section_numbers},
>     > {Link = resolve_section_ref}
>     > }
>     >
>     >
>     >
>     > While I do understand what it does, I cannot find out how to change it to
>     my
>     > case. How can I retrieve the part written in [] instead of the attributes
>     when
>     > scanning the document for those internal links? Or is the not even
>     possible?
>     >
>     > Any idea is appreciated.
>     >
>     >
>     > Torsten
>     >
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> References:
> 
> [1] https://github.com/lierdakil/pandoc-crossref/blob/master/docs/index.md
> [2] https://stackoverflow.com/questions/
> [3] https://groups.google.com/d/msgid/
> [4] http://40googlegroups.com/
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