{#- The documentation's navigation: every section under docs/, by weight, and
    the pages in each, by weight. -#}

{%- macro sidebar(current) -%}
{%- set docs = get_section(path="docs/_index.md") -%}
<nav class="sidebar-nav" aria-label="Documentation">
  {%- for sub_path in docs.subsections %}
  {%- set sub = get_section(path=sub_path) %}
  <div class="nav-group">
    <a class="nav-group-title" href="{{ sub.permalink }}"{% if sub.path == current %} aria-current="page"{% endif %}><span>{{ sub.extra.number }}</span>{{ sub.title }}</a>
    <ul>
      {%- for p in sub.pages %}
      <li><a href="{{ p.permalink }}"{% if p.path == current %} aria-current="page"{% endif %}>{{ p.extra.nav | default(value=p.title) }}</a></li>
      {%- endfor %}
    </ul>
  </div>
  {%- endfor %}
</nav>
{%- endmacro sidebar -%}

{#- The pages before and after this one, in the order of the sidebar. -#}
{%- macro pager(current) -%}
{%- set docs = get_section(path="docs/_index.md") -%}
{%- set_global flat = [] -%}
{%- for sub_path in docs.subsections -%}
  {%- set sub = get_section(path=sub_path) -%}
  {%- for p in sub.pages -%}
    {%- set_global flat = flat | concat(with=p) -%}
  {%- endfor -%}
{%- endfor -%}
{%- set_global at = -1 -%}
{%- for p in flat -%}
  {%- if p.path == current %}{% set_global at = loop.index0 %}{% endif -%}
{%- endfor -%}
{%- if at >= 0 %}
<nav class="pager" aria-label="Pages">
  {%- if at > 0 %}
  {%- set prev = flat | nth(n=at - 1) %}
  <a class="pager-link pager-prev" href="{{ prev.permalink }}">
    <span class="pager-label">Previous</span>
    <span class="pager-title">{{ prev.title }}</span>
  </a>
  {%- else %}<span></span>{% endif %}
  {%- if at + 1 < flat | length %}
  {%- set next = flat | nth(n=at + 1) %}
  <a class="pager-link pager-next" href="{{ next.permalink }}">
    <span class="pager-label">Next</span>
    <span class="pager-title">{{ next.title }}</span>
  </a>
  {%- endif %}
</nav>
{%- endif %}
{%- endmacro pager -%}

{%- macro toc(entries) -%}
{%- if entries | length > 0 %}
<nav class="toc" aria-label="On this page">
  <p class="toc-title">On this page</p>
  <ul>
    {%- for h2 in entries %}
    <li><a href="#{{ h2.id }}" data-toc-link>{{ h2.title }}</a>
      {%- if h2.children | length > 0 %}
      <ul>
        {%- for h3 in h2.children %}
        <li><a href="#{{ h3.id }}" data-toc-link>{{ h3.title }}</a></li>
        {%- endfor %}
      </ul>
      {%- endif %}
    </li>
    {%- endfor %}
  </ul>
</nav>
{%- endif %}
{%- endmacro toc -%}