darryn/Shopify tag filter groups

## Shopify tag filter groups
  {% if template contains 'collection' and collection.all_tags.size > 1 %}

  <!-- A recursive loop to catch and filter out the different tag categories -->
  {% assign c = 0 %}
  {% for t in collection.all_tags %}
  {% capture cat %}{{ cat }}{% capture temp_cat %}{% if t contains '_' %}{% assign cat_grp = t | split: '_' %}{{ cat_grp.first }}{% endif %}{% endcapture %}{% unless cat contains temp_cat %}{% if t contains '_' %}{% assign new_cat_grp = t | split: '_' %}{{ new_cat_grp.first }}{% endif %}{% unless forloop.last %}+{% endunless %}{% assign c = c | plus: 1 %}{% endunless %}{% endcapture %}
  {% endfor %}

  <!-- create array of tag categories -->
  {% assign cat_array = cat | split: '+' %}

  <!-- loop through tag categories -->
  {% for i in cat_array %}
  <!-- ignore if tag category is empty -->
  {% unless i == '' %}
  <h5>Filter by {{ i }}</h5>
  <ul class="nav">
    <!-- loop through collection tags -->
	  {% for t in collection.all_tags %}
	  <!-- if tag contains the category title -->
	  {% if t contains i %}
	  <!-- strip out tag category prefix and add/remove link for tag filtering -->
	  {% if current_tags contains t %}
	  <li>{{ t | remove: i | remove: '_' | append: '&nbsp;x' | link_to_remove_tag: t }}</li>
	  {% else %}
	  <li>{{ t | remove: i | remove: '_' | link_to_add_tag: t }}</li>
	  {% endif %}
	  {% endif %}
	  {% endfor %}
  </ul>
  {% endunless %}
  {% endfor %}

  {% endif %}
	{% if template contains 'collection' and collection.all_tags.size > 1 %}

	<!-- A recursive loop to catch and filter out the different tag categories -->
	{% assign c = 0 %}
	{% for t in collection.all_tags %}
	{% capture cat %}{{ cat }}{% capture temp_cat %}{% if t contains '_' %}{% assign cat_grp = t \| split: '_' %}{{ cat_grp.first }}{% endif %}{% endcapture %}{% unless cat contains temp_cat %}{% if t contains '_' %}{% assign new_cat_grp = t \| split: '_' %}{{ new_cat_grp.first }}{% endif %}{% unless forloop.last %}+{% endunless %}{% assign c = c \| plus: 1 %}{% endunless %}{% endcapture %}
	{% endfor %}

	<!-- create array of tag categories -->
	{% assign cat_array = cat \| split: '+' %}

	<!-- loop through tag categories -->
	{% for i in cat_array %}
	<!-- ignore if tag category is empty -->
	{% unless i == '' %}
	<h5>Filter by {{ i }}</h5>
	<ul class="nav">
	<!-- loop through collection tags -->
	{% for t in collection.all_tags %}
	<!-- if tag contains the category title -->
	{% if t contains i %}
	<!-- strip out tag category prefix and add/remove link for tag filtering -->
	{% if current_tags contains t %}
	<li>{{ t \| remove: i \| remove: '_' \| append: ' x' \| link_to_remove_tag: t }}</li>
	{% else %}
	<li>{{ t \| remove: i \| remove: '_' \| link_to_add_tag: t }}</li>
	{% endif %}
	{% endif %}
	{% endfor %}
	</ul>
	{% endunless %}
	{% endfor %}

	{% endif %}