web/tabs/categories.md

title	type
Categories	categories

{% assign HEAD_PREFIX = "h_" %} {% assign LIST_PREFIX = "l_" %}

{% assign group_index = 0 %}

{% assign sort_categories = site.categories | sort %}

{% for category in sort_categories %} {% assign category_name = category | first %} {% assign posts_of_category = category | last %} {% assign first_post = posts_of_category | first %}

{% if category_name == first_post.categories[0] %} {% assign sub_categories = "" | split: "" %}

{% for post in posts_of_category %}
  {% assign second_category = post.categories[1] %}
  {% if second_category %}
    {% unless sub_categories contains second_category %}
      {% assign sub_categories = sub_categories | push: second_category %}
    {% endunless %}
  {% endif %}
{% endfor %}

{% assign sub_categories = sub_categories | sort %}
{% assign sub_categories_size = sub_categories | size %}

{% if sub_categories_size > 0 %} {% else %} {% endif %} {{ category_name }}

    <!-- content count -->
    {% assign top_posts_size = site.categories[category_name] | size %}
    <span class="text-muted small font-weight-light">
      {% if sub_categories_size > 0 %}
        {{ sub_categories_size }}
        {% if sub_categories_size > 1 %}categories{% else %}category{% endif %},
      {% endif %}
        {{ top_posts_size }}
        post{% if top_posts_size > 1 %}s{% endif %}
    </span>
  </span>

  <!-- arrow -->
  {% if sub_categories_size > 0%}
  <a href="#{{ LIST_PREFIX }}{{ group_index }}" data-toggle="collapse" 
    aria-expanded="true" aria-label="{{ HEAD_PREFIX }}{{ group_index }}-trigger" 
    class="category-trigger hide-border-bottom">
    <i class="fas fa-fw fa-angle-down"></i>
  </a>
  {% else %}
  <span data-toggle="collapse" class="category-trigger hide-border-bottom disabled">
    <i class="fas fa-fw fa-angle-right"></i>
  </span>
  {% endif %}

</div> <!-- .card-header -->

<!-- Sub-categories -->
{% if sub_categories_size > 0 %}
<div id="{{ LIST_PREFIX }}{{ group_index }}" class="collapse show" aria-expanded="true">
  <ul class="list-group">
    {% for sub_category in sub_categories %}
    <li class="list-group-item">
      <i class="far fa-folder fa-fw"></i>
      <a href="{{ site.baseurl }}/categories/{{ sub_category | replace: ' ', '-' | downcase | url_encode }}/"
        class="ml-1 mr-2">{{ sub_category }}</a>
      {% assign posts_size = site.categories[sub_category] | size %}
      <span class="text-muted small font-weight-light">{{ posts_size }}
        post{% if posts_size > 1 %}s{% endif %}
      </span>
    </li>
    {% endfor %}
  </ul>
</div>
{% endif %}

{% assign group_index = group_index | plus: 1 %}

{% endif %} {% endfor %}