minetestblog.github.io/_includes/post/related.html

<aside class="related">

<h2>Related posts</h2>
<ul class="related-posts">

{% assign maxRelated = 4 %}
{% assign minCommonTags =  2 %}
{% assign maxRelatedCounter = 0 %}

  {% for post in site.posts %}

    {% assign sameTagCount = 0 %}
    {% assign commonTags = '' %}

    {% for tag in post.tags %}
      {% if post.url != page.url %}
        {% if page.tags contains tag %}
          {% assign sameTagCount = sameTagCount | plus: 1 %}
          {% capture tagmarkup %}
          <span class="label label-default">#{{ tag }}</span>
          {% endcapture %}
          {% assign commonTags = commonTags | append: tagmarkup %}
        {% endif %}
      {% endif %}
    {% endfor %}

    {% if sameTagCount >= minCommonTags %}

    {% include page/post-list-item.html %}

      {% assign maxRelatedCounter = maxRelatedCounter | plus: 1 %}
      {% if maxRelatedCounter >= maxRelated %}
        {% break %}
      {% endif %}
    {% endif %}

  {% endfor %}

</aside>

{% comment %}
{{ commonTags }}
{% endcomment %}