class Playbook::Markdown::HTMLBlockCode

def header(title, level)
  if level == 7
    @headers ||= []
    permalink = title.gsub(/\W+/, "-")
    if @headers.include?(permalink)
      permalink += "_1"
      loop do
        break unless @headers.include?(permalink)
        permalink.gsub!(/_(\d+)$/, "_#{Regexp.last_match(1).to_i + 1}")
      end
    end
    @headers << permalink
    %(\n<a name="#{permalink}" class="markdown-header-anchor anchor" href="##{permalink}"><span class="fa fa-link anchor-icon"></span></a><h#{level} id=\"#{permalink}\">#{title}</h#{level}>\n)
  else
    %(\n<h#{level}>#{title}</h#{level}>\n)
  end
end