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<!-- Put configured sections list to .Scratch -->
{{ template "book-get-root-section" . }}
<ul>
{{ range .Scratch.Get "BookSections" }}
{{ template "book-section" (dict "Section" . "CurrentPage" $.Permalink) }}
{{ end }}
</ul>
<!-- Single section of menu (recursive) -->
{{ define "book-section" }}
<li {{ if .Section.Params.booktopsection }}class="book-nav-section"{{ end }}>
{{ with .Section}}
{{- if .Content -}}
<a href="{{ .RelPermalink }}">{{- template "title" . -}}</a>
{{- else -}}
{{- template "title" . -}}
{{- end -}}
{{ end }}
<ul>
{{ range .Section.Sections }}
{{ template "book-section" (dict "Section" . "CurrentPage" $.CurrentPage) }}
{{ end }}
{{ range .Section.Pages }}
<li>
<a href="{{ .RelPermalink }}" class="{{ if eq $.CurrentPage .Permalink }}active{{ end }}">
{{- template "title" . -}}
</a>
</li>
{{ end }}
</ul>
</li>
{{ end }}
{{ define "book-get-root-section" }}
<!-- Complex logic to guess page title without .Title specified -->
{{ $bookSection := default "docs" .Site.Params.BookSection }}
{{ if eq $bookSection "*" }}
{{ .Scratch.Set "BookSections" .Site.Sections }}
{{ else }}
{{ $bookSections := where .Site.Sections "Section" $bookSection }}
{{ .Scratch.Set "BookSections" $bookSections }}
{{ if eq (len $bookSections) 1 }}
{{ $singleSection := index $bookSections 0 }}
{{ .Scratch.Set "BookSections" $singleSection.Sections }}
{{ end }}
{{ end }}
{{ end }}
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