menu_single.html

{% comment %}
  This page creates a single (non-submenu) item. It expects `item` as a variable. 
{% endcomment %}

{% assign menu_active = false %}

{% assign base_folder = page.url | split: '/' %}
{% assign base_folder = base_folder[1] %}

{% assign represents = include.item.active | split: '/' %}
{% assign represents = represents[1] %}

{% if represents %}
    {% if base_folder == represents %}
        {% assign menu_active = true %}
    {% endif %}
{% endif %}

{% if page.url == include.item.url %}
    {% assign menu_active = true %}
{% endif %}

{% unless include.item.menu_hidden %}
  <li
    {% if menu_active %}class="active"{% endif %}
    {% if page.url == include.item.url %}class="active"{% endif %}
  >
    {% if include.item.external %}
        <a href="{{ include.item.url }}" target="_blank">
    {% else %}
        <a href="{{ site.baseurl }}{{ include.item.url }}">
    {% endif %}
    
      {% if include.item.menu_title %}
        {{ include.item.menu_title }}
      {% else %}
        {{ include.item.title }}
      {% endif %}
    </a>
  </li>
{% endunless %}