{{ $all := slice }}
{{ range (site.GetPage "/docs").Sections.ByWeight }}
  {{ range .RegularPages.ByWeight }}{{ $all = $all | append . }}{{ end }}
  {{ range .Sections.ByWeight }}{{ range .RegularPages.ByWeight }}{{ $all = $all | append . }}{{ end }}{{ end }}
{{ end }}
{{ range (site.GetPage "/docs").RegularPages.ByWeight }}{{ $all = $all | append . }}{{ end }}
{{ $idx := -1 }}
{{ range $i, $p := $all }}{{ if eq $p.RelPermalink $.RelPermalink }}{{ $idx = $i }}{{ end }}{{ end }}
{{ if ge $idx 0 }}
<nav class="prev-next" aria-label="Page navigation">
  {{ if gt $idx 0 }}{{ $p := index $all (sub $idx 1) }}
  <a class="pn pn-prev" href="{{ $p.RelPermalink }}">
    <span class="pn-label">Previous</span>
    <strong class="pn-title">{{ $p.Title }}</strong>
  </a>
  {{ else }}<div class="pn-empty"></div>{{ end }}
  {{ if lt $idx (sub (len $all) 1) }}{{ $n := index $all (add $idx 1) }}
  <a class="pn pn-next" href="{{ $n.RelPermalink }}">
    <span class="pn-label">Next</span>
    <strong class="pn-title">{{ $n.Title }}</strong>
  </a>
  {{ end }}
</nav>
{{ end }}