class Vernier::Output::FileListing

def html_output(output, relevant_files)
  output << "<pre>"
  output << "  SELF     FILE\n"
  relevant_files.sort_by {|k, v| -v.values.map(&:self).sum }.each do |filename, file_contents|
    tmpl = "<details style=\"display:inline-block;vertical-align:top;\"><summary>%s</summary>"
    output << sprintf("% 5.1f%%   #{tmpl}\n", file_contents.values.map(&:self).sum * 100 / total.to_f, filename)
    format_file_html(output, filename, relevant_files)
    output << "</details>\n"
  end
  output << "</pre>"
end