hugo-tufte/layouts/book/all.html

{{ define "main" }}
<div id="layout">
<article>

{{ partial "brand.html" . }}
{{ partial "content.header.html" . }}

<!-- https://discourse.gohugo.io/t/how-to-build-one-collection-for-all-nested-sections/27950/5 -->
{{ with .Content }}
<section>
{{ . }}
</section>
{{ end }}

<section class="list-page">
{{ $indexScratch := .Scratch }}
{{ range .Sections }}
{{ $indexScratch.Add "sections" (slice . ) }}
{{ end }}

{{- range ($indexScratch.Get "sections").ByTitle -}}
<p><a href="{{ .RelPermalink }}">{{ .Title }}{{- if .Draft -}} :: Draft {{- end -}}</a></p>
<ul>
  {{- range .Pages.ByTitle -}}
  <li><a href="{{ .RelPermalink }}">{{ .Title }}{{- if .Draft -}} :: Draft {{- end -}}</a></li>
  {{- end -}}
</ul>
{{- end -}}
</section>

{{ partial "footer.html" . }}

</article>
</div>
{{ end }}