website/_includes/collecttags.html

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{% assign rawtags = "" %}
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{% for page in site.pages %}
{% assign ttags = page.tags | join:'|' | append:'|' %}
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{% assign rawtags = rawtags | append:ttags %}
{% endfor %}
{% assign rawtags = rawtags | split:'|' | sort %}
{% assign site.tags = "" %}
{% for tag in rawtags %}
{% if tag != "" %}
{% if tags == "" %}
{% assign tags = tag | split:'|' %}
{% endif %}
{% unless tags contains tag %}
{% assign tags = tags | join:'|' | append:'|' | append:tag | split:'|' %}
{% endunless %}
{% endif %}
{% endfor %}