Span = function(el)
  color = el.attributes['c']
  if color ~= nil then
    el.attributes['c'] = nil
    if FORMAT:match 'html' then
      el.attributes['style'] = 'color: ' .. color .. ';'
    elseif FORMAT:match 'latex' then
      table.insert(el.content, 1, pandoc.RawInline('latex', '\\textcolor{'..color..'}{'))
      table.insert(el.content, pandoc.RawInline('latex', '}'))
    end
  end

  background_color = el.attributes['bc']
  if background_color ~= nil then
    el.attributes['bc'] = nil
    if FORMAT:match 'html' then
      el.attributes['style'] = 'background-color: ' .. background_color .. ';'
    elseif FORMAT:match 'latex' then
      table.insert(el.content, 1, pandoc.RawInline('latex', '\\colorbox{'..background_color..'}{'))
      table.insert(el.content, pandoc.RawInline('latex', '}'))
    end
  end
  return el
end

Link = function(el)
  if FORMAT:match 'plain' then
    -- Converting from Markdown to Plain Text loses any link URLs
    -- https://github.com/jgm/pandoc/issues/2399
    return table.insert(el.content, {pandoc.Space(), " <", pandoc.Str(el.target), pandoc.Str ">"})
  else
    background_color = el.attributes['bc']
    if background_color ~= nil then
      el.attributes['bc'] = nil
      if FORMAT:match 'html' then
        el.attributes['style'] = 'background-color: ' .. background_color .. ';'
      elseif FORMAT:match 'latex' then
        table.insert(el.content, 1, pandoc.RawInline('latex', '\\colorbox{'..background_color..'}{'))
        table.insert(el.content, pandoc.RawInline('latex', '}'))
      end
    end
    return el
  end
end

Div = function(el)
  local admonitions =
          { important = "Important"
          , attention = "Attention"
          , information = "Information"
          , problem = "Problème"
          , solution = "Solution"
          }
  if admonitions[el.classes[1]] ~= nil
  then
    if FORMAT:match 'html' then
      ad_type = pandoc.Div(admonitions[el.classes[1]], { class = 'admonition-type' })
      ad_content = pandoc.Div(el.content, { class = 'admonition-content' })
      el.content = { ad_type, ad_content }
      table.insert(el.classes, 1, 'admonition')
    elseif FORMAT:match 'latex' then
      table.insert(el.content, 1, pandoc.RawBlock("latex", "\\begin{quote_" .. el.classes[1] .. "}"))
      table.insert(el.content, pandoc.RawBlock("latex", "\\end{quote_" .. el.classes[1] .. "}"))
    end
  end
  return el
end