categories.html

---
layout: page 
title:  Categories 
---

{% comment %}
=======================
The following part extracts all the categories from your posts and sort categories, so that you do not need to manually collect your categories to a place.
=======================
{% endcomment %}
{% assign rawcategories = "" %}
{% for post in site.posts %}
	{% assign tcategories = post.categories | join:'|' | append:'|' %}
	{% assign rawcategories = rawcategories | append:tcategories %}
{% endfor %}
{% assign rawcategories = rawcategories | split:'|' | sort %}

{% comment %}
=======================
The following part removes dulpicated categories and invalid categories like blank category.
=======================
{% endcomment %}
{% assign categories = "" %}
{% for category in rawcategories %}
	{% if category != "" %}
		{% if categories == "" %}
			{% assign categories = category | split:'|' %}
		{% endif %}
		{% unless categories contains category %}
			{% assign categories = categories | join:'|' | append:'|' | append:category | split:'|' %}
		{% endunless %}
	{% endif %}
{% endfor %}
{% comment %}
=======================
The purpose of this snippet is to list all your posts posted with a certain category.
=======================
{% endcomment %}
{% for category in categories %}
	<h2 id="{{ category | slugify }}">{{ category }}</h2>
	<ul>
	 {% for post in site.posts %}
		 {% if post.categories contains category %}
		 <li>
		 <h3 style="display:inline">
		 <a href="{{ post.url }}">
		 {{ post.title }}
                 </a>
                 </h3>
                 <small>{{ post.date | date_to_string }}</small>
		 </li>
		 {% endif %}
	 {% endfor %}
	</ul>
{% endfor %}