Shopify semi-automatic vendor collections

product.liquid

{% assign product_vendor_handle = product.vendor | handle %}

{% if collections[product_vendor_handle].handle == product_vendor_handle %}
  {% assign vendor_url = collections[product_vendor_handle].url %}
{% else %}
  {% assign vendor_url = product.vendor | url_for_vendor %}
{% endif %}

<div id="product-vendor"><span class="product-vendor">{{ product.vendor | link_to: vendor_url }}</span></div>