that is breadcrumbs liquid code
{%- unless template == 'index' or template == 'cart' -%}
<a href="/" title="Home">Home</a>
{% case template %}
{% when 'article' %}
{% for link in linklists.main-menu.links %}
{%- if link.url == blog.url -%}
<span aria-hidden="true">›</span> <!--Breadcrumb Delimeter -->
{{link.title | link_to: link.url}}
{% break %}
{%- endif -%}
{% endfor %}
<span aria-hidden="true">›</span>
<a href="{{ article.url }}" aria-current="page">{{ article.title }}</a>
{%- when "product" -%}
{%- capture product_url_string -%}
{%- for collection in product.collections -%}
{{collection.url }}|
{%- endfor -%}
{%- endcapture -%}
{%- assign object_url_string = product_url_string | append: product.url -%}
{%- assign object_urls = object_url_string | split: '|' -%}
{%- capture linklist_titles_str -%}{%- for linklist in linklists -%}{{ linklist.title | handleize }}|{%- endfor -%}{%- endcapture -%}
{%- assign str_size = linklist_titles_str | size | minus: 1 -%}
{%- assign linklist_titles_str = linklist_titles_str | slice: 0, str_size -%}
{%- assign linklist_titles = linklist_titles_str | split: '|' -%}
{%- assign level = 1 -%}
{%- for link in linklists.main-menu.links -%}
{%- assign link_handle = link.title | handle -%}
{%- assign link_titles = link_titles | append: link.title | append: '|' -%}
{%- assign link_urls = link_urls | append: link.url | append: '|' -%}
{%- assign link_levels = link_levels | append: level | append: '|' -%}
{%- assign link_parents = link_parents | append: 'main-menu' | append: '|' -%}
{%- assign link_handles = link_handles | append: link_handle | append: '|' -%}
<!--Checks to see if there is a linklist for current link_handle so we can do an inner loop (2nd level deep)-->
{%- if linklist_titles contains link_handle -%}
{%comment%} GET CHILDREN {%endcomment%}
{%- for clink in linklists[link_handle].links -%}
{%- if forloop.first == true -%}
{%- assign level = level | plus: 1 -%}
{%- endif -%}
{% assign clink_handle = clink.title | handle %}
{%- assign link_titles = link_titles | append: clink.title | append: '|' -%}
{%- assign link_urls = link_urls | append: clink.url | append: '|' -%}
{%- assign link_levels = link_levels | append: level | append: '|' -%}
{%- assign link_parents = link_parents | append: link_handle | append: '|' -%}
{%- assign handle = link.title | handleize -%}
{%- assign link_handles = link_handles | append: clink_handle | append: '|' -%}
<!--Checks to see if there is a linklist for current child link_handle so we can do an inner inner loop (3rd level deep)-->
{%- if linklist_titles contains clink_handle -%}
{%comment%} GET GRANDCHILDREN {%endcomment%}
{%- for gclink in linklists[clink_handle].links -%}
{%- if forloop.first == true -%}
{%- assign level = level | plus: 1 -%}
{%- endif -%}
{% assign gclink_handle = gclink.title | handle %}
{%- assign link_titles = link_titles | append: gclink.title | append: '|' -%}
{%- assign link_urls = link_urls | append: gclink.url | append: '|' -%}
{%- assign link_levels = link_levels | append: level | append: '|' -%}
{%- assign link_parents = link_parents | append: gclink_handle | append: '|' -%}
{%- assign link_handles = link_handles | append: gclink_handle | append: '|' -%}
<!--Checks to see if there is a linklist for current grand child link_handle so we can do an inner inner inner loop (4th level deep)-->
{%- comment -%}It's done at this point{%- endcomment -%}
{%- if forloop.last == true -%}
{%- assign level = level | minus: 1 -%}
{%- endif -%}
{%- endfor -%}
{%comment%} END GRANDCHILDREN {%endcomment%}
{%- endif -%}
{%- if forloop.last == true -%}
{%- assign level = level | minus: 1 -%}
{%- endif -%}
{%- endfor -%}
{%comment%} END CHILDREN {%endcomment%}
{%- endif -%}
{%- endfor -%}
{%- comment -%} CONVERT TO ARRAYS {%- endcomment -%}
{%- assign str_size = link_levels | size | minus: 1 -%}
{%- assign llevels = link_levels | slice: 0, str_size | split: '|' -%}
{%- assign str_size = link_titles | size | minus: 1 -%}
{%- assign ltitles = link_titles | slice: 0, str_size | split: '|' -%}
{%- assign str_size = link_handles | size | minus: 1 -%}
{%- assign lhandles = link_handles | slice: 0, str_size | split: '|' -%}
{%- assign str_size = link_parents | size | minus: 1 -%}
{%- assign lparents = link_parents | slice: 0, str_size | split: '|' -%}
{%- assign str_size = link_urls | size | minus: 1 -%}
{%- assign lurls = link_urls | slice: 0, str_size | split: '|' -%}
{%- comment -%} GET THE DEEPEST LEVEL WE FOUND {%- endcomment -%}
{%- assign depth = '3' -%} <!--This is the deepest you can go in Shopify-->
{%- assign bc3_parent_list_handle = '' %}
{%- comment -%}Example output for {{ llevels }} this could be: 11122211 {%- endcomment -%}
{%- comment -%} LEVEL 3: THREE DOWN FROM THE TOP {%- endcomment -%}
{%- comment -%} Do we have a link to this product or its collection on the deepest level? {%- endcomment -%}
{%- for url in lurls -%}
<!--Checks if the current url is a value in the urls stored in liquid of all the pages you have visited and if that url matches the current depth of 3-->
{%- if object_urls contains url and llevels[forloop.index0] == depth -%}
{%- unless url == product.url or url == collection.url -%}
{%- capture bc3 -%}{{ ltitles[forloop.index0] | link_to: url, ltitles[forloop.index0] }}{%- endcapture -%}
{%- endunless -%}
{%- assign bc3_parent_list_handle = lparents[forloop.index0] -%}
{%- assign bc3_list_handle = lhandles[forloop.index0] -%}
{% break %}
{%- endif -%}
{%- endfor -%}
{%- comment -%} LEVEL 2: TWO DOWN FROM THE TOP
Next level. If we found something, we can save a lot of processing. Otherwise,
we need to scan everything on this level
{%- endcomment -%}
{%- assign depth = '2' -%}
{%- assign bc2_parent_list_handle = '' %}
{%- comment -%} IF we didn't find anything on the deepest level, we start from scratch one level up {%- endcomment -%}
{%- if bc3_parent_list_handle == '' -%}
{%- for url in lurls -%}
{%- if llevels[forloop.index0] == depth -%}
{%- if object_urls contains url -%}
{%- unless url == product.url or url == collection.url -%}
{%- capture bc2 -%}{{ ltitles[forloop.index0] | link_to: url, ltitles[forloop.index0] }}{%- endcapture -%}
{% endunless %}
{%- assign bc2_parent_list_handle = lparents[forloop.index0] -%}
{%- break -%}
{%- endif -%}
{%- endif -%}
{%- endfor -%}
{%- comment -%} ELSE we have a parent handle. We need its array index to find its other data {%- endcomment -%}
{%- else -%}
{%- for list_handle in lhandles -%}
{%- if list_handle == bc3_parent_list_handle -%}
{% assign bc2_list_handle = list_handle %}
{%- assign bc2_parent_list_handle = lparents[forloop.index0] -%}
{%- assign bc2_list_title = ltitles[forloop.index0] -%}
{%- comment -%} we have the handle of bc2's parent, so now we get the parent links, find where title matches parent title, then we have the collection URL {%- endcomment -%}
{%- for bc2_sibling_link in linklists[bc2_parent_list_handle].links -%}
{%- assign bc2_sibling_title_handleized = bc2_sibling_link.title | handle -%}
{% if bc2_sibling_title_handleized == bc2_list_handle %}
{%- capture bc2 -%}{{ bc2_sibling_link.title | link_to: bc2_sibling_link.url, bc2_sibling_link.title }}{%- endcapture -%}
{% break %}
{%- endif -%}
{%- endfor -%}
{% break %}
{%- endif -%}
{%- endfor -%}
{%- endif -%}
{%- comment -%} LEVEL 1: MAIN ITEMS BELOW MAIN MENU (I.E. TOP NAV BAR) {%- endcomment -%}
{%- assign depth = depth | minus: 1 | append: '' -%}
{%- assign bc1_parent_list_handle = '' %}
{%- if bc2_parent_list_handle == '' -%}
{%- comment -%} IF found nothing on deepest level or middle level, we start from scratch on top level {%- endcomment -%}
{% for url in lurls %}
{%- if object_urls contains url and llevels[forloop.index0] == depth -%}
{%- unless url == product.url or url == collection.url -%}
{%- capture bc1 -%}{{ ltitles[forloop.index0] | link_to: url, ltitles[forloop.index0] }}{%- endcapture -%}
{% endunless %}
{%- assign bc1_parent_list_handle = lparents[forloop.index0] -%}
{%- break -%}
{%- endif -%}
{%- endfor -%}
{%- comment -%}
ELSE we have a parent handle. We need its array index to find its other data
{%- endcomment -%}
{%- else -%}
{%- for list_handle in lhandles -%}
{%- if bc2_parent_list_handle == list_handle -%}
{% assign bc1_list_handle = list_handle %}
{%- assign bc1_parent_list_handle = lparents[forloop.index0] -%}
{%- assign bc1_title = ltitles[forloop.index0] -%}
{%- comment -%}
We HAVE PARENT, so now we GET THE SIBLING links, find where title
matches parent title, then we have the collection URL
{%- endcomment -%}
{%- for bc1_sibling_link in linklists[bc1_parent_list_handle].links -%}
{%- assign bc1_sibling_title_handleized = bc1_sibling_link.title | handle -%}
{% if bc1_sibling_title_handleized == bc1_list_handle %}
{%- capture bc1 -%}{{ bc1_sibling_link.title | link_to: bc1_sibling_link.url, bc1_sibling_link.title }}{%- endcapture -%}
{% break %}
{%- endif -%}
{%- endfor -%}
{%- endif -%}
{%- endfor -%}
{%- endif -%}
{%- if bc1 -%}
<span aria-hidden="true">›</span> <!--Breadcrumb Delimeter -->
{{ bc1 }}
{%- endif -%}
{%- if bc2 -%}
<span aria-hidden="true">›</span>
{{ bc2 }}
{%- endif -%}
{%- if bc3 -%}
<span aria-hidden="true">›</span>
{{ bc3 }}
{%- endif -%}
<span aria-hidden="true">›</span>
<span>{{ product.title }}</span>
{%- else -%}
{% for link in linklists.main-menu.links %}
{% if link.child_active or link.active %}
› <!--Breadcrumb delimeter-->
<a href="{{ link.url }}">
{{ link.title | escape }}
</a>
{% for clink in link.links %}
{% if clink.child_active or clink.active %}
›
<a href="{{ clink.url }}">
{{ clink.title | escape }}
</a>
{% for gclink in clink.links %}
{% if gclink.child_active or gclink.active %}
›
<a href="{{ gclink.url }}">
{{ gclink.title | escape }}
</a>
{% endif %}
{%- endfor -%}
{% endif %}
{%- endfor -%}
{% endif %}
{%- endfor -%}
{% endcase %}
