class Kramdown::Converter::Toc

def convert(el)
  if el.type == :header && in_toc?(el)
    attr = el.attr.dup
    attr['id'] = generate_id(el.options[:raw_text]) if @options[:auto_ids] && !attr['id']
    add_to_toc(el, attr['id'], @toc) if attr['id']
  else
    el.children.each {|child| convert(child)}
  end
  @toc
end