class PandocRenderer extends require "sitegen.renderers.markdown"
  unescape_cosmo = @unescape_cosmo
  escape_cosmo = @escape_cosmo

  command: "pandoc"

  render: (page, md_source) =>
    md_source = page\pipe "renderer.markdown.pre_render", md_source
    md_source, escapes = escape_cosmo md_source

    markup_filename = os.tmpname!
    input_handle = io.popen @command .. " > " .. markup_filename, "w"
    input_handle\write md_source
    input_handle\close!

    output_handle = io.open markup_filename, "r"
    result = output_handle\read "*a"
    output_handle\close!

    html_source = assert result
    html_source = unescape_cosmo html_source, escapes

    super page, html_source