Lua filter for section numbers in internal references

["be...-GbY3e145aRm8w6eVIr4Tmg@public.gmane.org" <berg-GbY3e145aRm8w6eVIr4Tmg@public.gmane.org>]

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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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