hugo-geekblog/layouts/shortcodes/toc.html

{{ $tocLevels := default (default 6 .Site.Params.GeekblogToC) .Page.Params.GeekblogToC }}

{{ if and $tocLevels .Page.TableOfContents }}
  <div class="gblog-toc gblog-toc__level--{{$tocLevels}}">{{ .Page.TableOfContents }}<hr></div>
{{ end }}