Getting a sorted list of tags in Jekyll with no plugins

gistfile1.txt

{% capture tags %}{% for tag in site.tags %}{{ tag[0] }}|{% endfor %}{% endcapture %}
{% assign sortedtags = tags | split:'|' | sort %}

{% for tag in sortedtags %}
  <a name="{{ tag }}"></a>
  <h2>{{ tag }}</h2>
  <ul>
    {% for post in site.tags[tag] %}
      <li><a href="{{ post.url }}">{{ post.title }}</a></li>
    {% endfor %}
  </ul>
{% endfor %}

This is a slightly modified version of Christian Specht's hack. My tags contained spaces, so splitting on space would break one tag into many and not work correctly. The code above generates the tags without any extra spaces and uses the pipe (|) character as a delimiter instead.