topics.html

---
layout: page
title: Topics
order: 1
---

{% comment %}
Extract raw tags
{% endcomment %}
{% assign rawtags = "" %}
{% for post in site.posts %}
  {% assign ttags = post.tags | join:'|' | append:'|' %}
  {% assign rawtags = rawtags | append:ttags %}
{% endfor %}
{% assign rawtags = rawtags | split:'|' | sort_natural %}

{% comment %}
Remove dulpicated tags and invalid tags like blank tag
{% endcomment %}
{% assign 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 %}

{% for tag in tags %}
  <h2 id="{{ tag | slugify }}">{{ tag }}</h2>
  <ul>
  {% for post in site.posts %}
    {% if post.tags contains tag %}
    <li>
      <a href="{{ post.url }}">{{ post.title }}</a>
      <small>{{ post.date | date_to_string }}</small>
    </li>
    {% endif %}
  {% endfor %}
  </ul>
{% endfor %}