Generic recursive nav markup generator for Shopify, works with non-latin alphabet and to any depth.

recursive_nav_helper.liquid

{% comment %}
Usage: {% include 'recursive-navigation-helper' with 'main-menu' %}
{% endcomment %}

{% comment %} Sanity check to prevent infinite recursion {% endcomment %}
{% assign sanity = sanity | plus: 1 %}

{% if sanity < 10000 %}
{% if linklists[recursive-navigation-helper].links.size > 0 %}

<ul>
{% for link in linklists[recursive-navigation-helper].links %}
    <li{% if link.active %} class="active"{% endif %}>
        <a href="{{ link.url }}">{{ link.title }}</a>
        {% comment %} ADVANCED MODE - uses 'sub' prefix and namespacing: sub-clothes-large {% endcomment %}
        {% if settings.adv_nav %}
            {% comment %} Remove 'main-menu' as we don't use that in our namespacing {% endcomment %}
            {% assign current_menu_handle = recursive-navigation-helper | remove: 'main-menu' %}
            
            {% comment %} Append new handle to extend namespace {% endcomment %}
            {% assign sub_menu_list_handle_stub = current_menu_handle | append: '-' | append: link.title | handleize %}
            
            {% comment %} If handle doesn't begin with 'sub-', prepend it {% endcomment %}
            {% assign split_nav_handle_first = recursive-navigation-helper | split: '-' | first %}
            {% unless split_nav_handle_first == 'sub' %}
                {% assign sub_menu_list_handle_stub = 'sub-' | append: sub_menu_list_handle_stub %}
            {% endunless %}
        {% else %}
            {% assign sub_menu_list_handle_stub = link.title | handleize %}
        {% endif %}
        
        {% comment %} Include new menu - recursive {% endcomment %}
        {% include 'recursive-navigation-helper' with sub_menu_list_handle_stub %}
    </li>
{% endfor %}
</ul>
{% else %}

  {% comment %} Check for foreign-language links {% endcomment %}
  {% assign has_drop_down = false %}
  {% if recursive-navigation-helper == '' %}
      {% for i in (0..8) %}
        {% unless has_drop_down %}
          {% if forloop.first %}
            {% assign temp = 'link-list' %}
          {% else %}
            {% capture temp %}link-list-{{ i }}{% endcapture %}
          {% endif %}
          {% if linklists[temp] and linklists[temp].links.size > 0 and linklists[temp].title == link.title %}
            {% assign has_drop_down = true %}
            {% assign child_list_handle = temp %}
          {% endif %}
        {% endunless %}
      {% endfor %}
  {% endif %}
  {% if has_drop_down %}
    {% include 'recursive-navigation-helper' with child_list_handle %}
  {% endif %}
{% endif %}
{% endif %}