debug-product-alt-colours.liquid

{%- assign tag_alt = "BLANK" -%}
{%- for tag in product.tags -%}
  {%- assign tag_prefix = tag | slice: 0, 5 -%}
  {%- if tag_prefix == "_alt_" -%}
    {%- assign tag_alt = tag -%}
    <!-- looking for tag {{ tag_alt }} -->
    {%- break -%}
    {%- else -%}
    <!-- tag {{ tag }} has no "_alt" prefix -->
  {%- endif -%}
    {%- else -%}
    <!-- no product tags found -->
{%- endfor -%}
{%- unless tag_alt == "BLANK" -%}
  {%- assign vendor_handle = product.vendor | handle -%}
  <!-- looking for collection /collections/{{vendor_handle}} -->
  {%- if collections[vendor_handle].products.size > 0 -%}
    {%- assign alt_products_total = 0 -%}
    {%- capture products_output -%}
      {%- paginate collections[vendor_handle].products by 200 -%}
        {%- for alt_product in collections[vendor_handle].products -%}
          {%- if alt_product.tags contains tag_alt -%}
            {%- unless alt_product.id == product.id -%}
            {%- assign alt_products_total = alt_products_total | plus: 1 -%}
            <a href="{{ alt_product.url }}" title="{{ alt_product.title }}"><img src="{{ alt_product.featured_image | img_url: '90x90', crop: 'center', format: 'pjpg' }}" alt="{{ alt_product.title }}"></a>
            {%- else -%}
            <!-- product {{ alt_product.title }} is the current product so we skip -->
            {%- endunless -%}
          {%- else -%}
          <!-- product {{ alt_product.title }} doesn't have the {{ tag_alt }} tag -->
          {%- endif -%}
        {%- else -%}
        <!-- no products in the {{ vendor_handle }} collection -->
        {%- endfor -%}
      {%- endpaginate -%}
    {%- endcapture -%}
  {%- else -%}
  <!-- {{ vendor_handle }} collection has no products or doesn't exist -->
  {%- endif -%}
{%- else -%}
<!-- no tag_alt set -->
{%- endunless -%}
{%- if alt_products_total > 0 -%}
<br><br>
<p><strong>Also Available In:</strong></p>
<div class="product-alt-colours">
{{ products_output }}
</div>
{%- else -%}
<!-- 0 products found -->
{%- endif -%}