{{/*  inspired by https://github.com/alex-shpak/hugo-book/blob/master/layouts/partials/docs/menu-filetree.html  */}}
{{ $section := default "/" .Site.Params.BookSection  }}
{{ if eq $section "*" }}
  {{ $section = "/" }} {{/* Backward compatibility */}}
{{ end }}

{{ with .Site.GetPage $section }}
  {{ template "folder-children" (dict "Section" . "CurrentPage" $) }}
{{ end }}

{{ define "folder-children" }}{{/* (dict "Section" .Section "CurrentPage" .CurrentPage) */}}
  <ul>
    {{ range (where .Section.Pages "Params.hidden" "ne" true) }}
      {{ if .IsSection }}
        <li class="folder">
          <div class="wrapper">
            <div class="a-wrapper">
              <div class="arrow"></div>
            </div>
            <a href="{{ .Page.RelPermalink }}" class="title">
              {{- partial "title" .Page -}}
            </a>
          </div>
          {{ template "folder-children" (dict "Section" . "CurrentPage" $.CurrentPage) }}
        </li>
      {{ else if and .IsPage }}
        <li>
          {{ template "children-link" (dict "Page" . "CurrentPage" $.CurrentPage) }}
        </li>
      {{ end }}
    {{ end }}
  </ul>
{{ end }}

{{ define "children-link" }}{{/* (dict "Page" .Page "CurrentPage" .CurrentPage) */}}
  {{ $current := eq .CurrentPage .Page }}
    <a href="{{ .Page.RelPermalink }}" class="page-link">
      {{- partial "title" .Page -}}
    </a>
{{ end }}