hugo pko dev docs toc example

gistfile1.txt

  {{ $startLevel := .Site.Params.tocStartLevel | default 2 }}
  {{ $endLevel := .Site.Params.tocEndLevel | default 3 }}
  {{ $tagRe := printf "h[%d-%d]" $startLevel $endLevel }}
  {{ $tocRe := printf "<%s.*?>(.|\n])+?</%s>" $tagRe $tagRe }}
  {{ $headers := findRE $tocRe .Content   }}
  <nav id="TableOfContents">
    <ul>
      <li class="nav-h0"><a href="#page-top">{{.Title}}</a></li>
      {{ range $headers }}
        {{ $tagname := substr . 1 2 }}
        {{ $header := . | plainify | htmlUnescape }}
        <li class="toc-{{$tagname}}">
          <a href='#{{ $header | anchorize }}'>{{ $header }}</a>
        </li>
      {{ end }}
    </ul>
  </nav>