docs/_includes/topbar.html

{% assign p = '/toc-menu.json' %}
{% capture tocm_string %}{% readj p %}{% endcapture %}
{% jsonball tocm from var tocm_string %}

{% capture pagesiteurl %}{{ site.url }}{{ page.url }}{% endcapture %}

<ul id="mainmenu"><!-- INSERT LINKS -->
            
{% for x in tocm %}
  {% capture ifactive %}
    {% if pagesiteurl == x.file %}toc-active
      {% else %}{% if x.children %}{% for x2 in x.children %}
        {% if pagesiteurl == x2.file %}toc-active
          {% else %}{% if x2.children %}{% for x3 in x2.children %}
            {% if pagesiteurl == x3.file %}toc-active
              {% else %}{% if x3.children %}{% for x4 in x3.children %}
                {% if pagesiteurl == x4.file %}toc-active{% endif %}
              {% endfor %}{% endif %}
            {% endif %}
          {% endfor %}{% endif %}
        {% endif %}
      {% endfor %}{% endif %}
    {% endif %}
  {% endcapture %}
  {% capture ifactive %}{{ ifactive | trim }}{% endcapture %}
  <li class="{{ifactive}}"><a href="{{ x.file }}">{{x.title}}</a></li>
{% endfor %}

</ul>