Re: Lua filter for section numbers in internal references

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

It seems that you can use pandoc-crossref for such case: see the manual here (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...-GbY3e145aRm8w6eVIr4Tmg@public.gmane.org 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 (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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