[Shopify] Three level collection navigation using tags

gistfile1.liquid

<ul>
  {% comment %}A linklist should be created called "Collections" containing each of the "top" level collections{% endcomment %}
  {% for link in linklists.collections.links %}
    {% assign col = link.object %}
    <li class="{% if col.handle == collection.handle %}active{% endif %}">
      <a href="{{ link.url }}"><span>{{ link.title }}</span></a>
      {% if col.all_tags.size > 0 %}
      <ul>
      {% assign tag_index = 0 %}
      {% assign current_tag = "" %}
      {% for tag in col.tags %}  

      {% comment %}Return the full tag and split it into parts {% endcomment %}
      {% assign tag_title = tag | split: ' - ' %} 

      {% comment %}We need to get the current index to check the next tag {% endcomment %}
      {% assign tag_index = forloop.index %}
      {% assign next_tag = col.tags[tag_index] | split: ' - ' %}

      {% comment %}We can check if the tag contains the collection title, and if a "sub collection" tag exists within this tag {% endcomment %}				
      {% assign tag_handle = tag | handle %} 
      {% if tag_handle contains col.handle and tag_title.size > 1 %}
        {% unless tag_title[1] == current_tag %}
        <li><a href="{{ link.url }}/{{ tag | handle }}">{{ tag_title[1] }}</a>
        {% if next_tag[1] == tag_title[1] %}<ul>{% else %}</li>{% endif %}                	 
        {% endunless %}

        {% comment %}If the tag was split into more than two parts, we know a third level exists {% endcomment %}        	
        {% if tag_title.size > 2 and tag_title[1] == current_tag %}

          <li><a href="{{ link.url }}/{{ tag | handle }}">{{ tag_title[2] }}</a></li>

        {% if current_tag != next_tag[1] %}</ul></li>{% endif %}

      {% endif %}

      {% assign current_tag = tag_title[1] %}
      {% endif %}
      {% endfor %}
      </ul>
      {% endif %}
    </li>
  {% endfor %}
</ul>