Pandoc Lua Filter to convert Some Definition Lists to Latex theorem-like Environments and some references to cref tags

definionlist-filter.lua

-- #!/usr/bin/env lua

-- Pandoc filter to add recommendation blocks in Latex and recognise cleveref references (cref)
--
-- Markdown Example:
--
-- Recommendation (Use of Pandoc) {#rec:pandoc}
-- :   Pandoc is a nice editor for several reasons:
--
--     - fast
--     - lua support
--
-- When choosing your toolchain, please consider @rec:pandoc.

function Cite (elt)
  if elt.citations[1].id:match('^rec:') then
    local ids = {}
    for i,citation in ipairs(elt.citations) do
      ids[i] = citation.id
    end

    if FORMAT:match('latex') then
      return pandoc.RawInline('latex', '\\cref{'..table.concat(ids, ',')..'}')
    elseif FORMAT:match('html') then
      -- TODO
    end
  end
end

function DefinitionList (elt)
  local header = elt.content[1][1]
  if header[1].text:match '^Recommendation' then
    local headertext = ''
    for i,s in ipairs(header) do
      headertext = headertext .. (s.text or ' ')
    end
    local caption = headertext:match('%((.-)%)') or ''
    local label   = headertext:match('%{#(.-)%}')
    local labeltag = ''
    if label ~= nil then
      labeltag = '\\label{'..label..'}'
    end

    local content = table.move(elt.content[1], 2, #elt.content[1], 1, {})

    content = content[1][1] -- TODO: dismisses 2nd and later def list items

    if FORMAT:match('latex') then
      table.insert(content, 1, pandoc.RawBlock('latex', '\\begin{recommendation}[' .. caption .. ']' .. labeltag))
      table.insert(content,    pandoc.RawBlock('latex', '\\end{recommendation}'))

      return content
    elseif FORMAT:match('html') then
      -- TODO
    end
  end
end

latex-header.tex

% put this somewhere in the header

% recommendation environment, need to load before cleveref
\usepackage{amsthm}

% cleveref in-document links
\usepackage[
  capitalise,
  nameinlink,
  noabbrev,
]{cleveref}

% recommendation envirnoment must be loaded after cleveref,
% see http://ctan.triasinformatica.nl/macros/latex/contrib/cleveref/cleveref.pdf sec. 14.1
\theoremstyle{definition} % set the style of subsequent theorem-like environments
\newtheorem{recommendation}{Recommendation}