web/_layouts/categories.html

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---
layout: page
# All the Categories of posts
# v2.0
# https://github.com/cotes2020/jekyll-theme-chirpy
# © 2017-2019 Cotes Chung
# MIT License
---
{% 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 %}
<div class="card categories">
<!-- top-category -->
<div class="card-header d-flex justify-content-between hide-border-bottom"
id="{{ HEAD_PREFIX }}{{ group_index }}">
<span>
{% if sub_categories_size > 0 %}
<i class="far fa-folder-open fa-fw"></i>
{% else %}
<i class="far fa-folder fa-fw"></i>
{% endif %}
<a href="{{ site.baseurl }}/categories/{{ category_name | slugify | url_encode }}/"
class="ml-1 mr-2">
{{ category_name }}
</a>
<!-- 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 pl-0">
{% 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 | slugify | 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 %}
</div> <!-- .card -->
{% assign group_index = group_index | plus: 1 %}
{% endif %}
{% endfor %}