_includes/doctoc.html

{% comment %}
Notes:
* Other doc attributes: relative_path, url
* Directories don't matter at all. You don't have to use them.
* File names don't matter either, except the alphabetical order between them.
{% endcomment %}
      
{% assign doc_data = 'docs_' | append: site.active_lang %}
{% assign page_data = site.data[doc_data].by_title[page.title] %}
{% capture titles %} {{ page.title }}|{{ page_data.breadcrumbs[0].title}}|{{page_data.breadcrumbs[1].title}}{% endcapture %}
{% capture titles_array %} {{ titles | split: "|" }} {% endcapture %}
<aside class="sidebar">
  <div class="docsidebar">
    <div class="docsidebarwrapper">
      <ul style="display: block;">
      {% for doc0 in site.data[doc_data].hierarchy %}
        {% if doc0.children.size == 0 %}
          <li class="toctree-l1{% if page.title == doc0.title %} current{% endif %}"><a class="reference internal" href="{{ site.baseurl }}{{ doc0.url }}">{{ doc0.title }}</a></li>
        {% else %}
          <li class="toctree-l1{% if page.title == doc0.title %} current{% endif %}{%if titles_array contains doc0.title %} current_section {% endif %}"><a href="javascript: void(0);">{{ doc0.title }}</a></li>
          <ul {% if titles_array contains doc0.title %}class="current_section"{% else %}style="display: none"{% endif %}>
          {% for doc1 in doc0.children %}
            {% if doc1.children.size == 0 %}
              <li class="toctree-l2{% if page.title == doc1.title %} current{% endif %}"><a class="reference internal" href="{{ site.baseurl }}{{ doc1.url }}">{{ doc1.title }}</a></li>
            {% else %}
              <li class="toctree-l2{% if page.title == doc1.title %} current{% endif %}"><a href="javascript: void(0);">{{ doc1.title }}</a></li>
              <ul style="{% if titles_array contains doc1.title%}{%else%}display: none{% endif %}">
              {% for doc2 in doc1.children %}
                <li class="toctree-l3{% if page.title == doc2.title %} current{% endif %}"><a class="reference internal" href="{{ site.baseurl }}{{ doc2.url }}">{{ doc2.title }}</a></li>
              {% endfor %}
            </ul>
            {% endif %}
          {% endfor %}
          </ul>
        {% endif %}
      {% endfor %}
      </ul>

    </div>
  </div>
</aside>