Neighbor Articles Plugin for Pelican
====================================
This plugin adds ``next_article`` (newer) and ``prev_article`` (older)
variables to the article's context.
Also adds ``next_article_in_category`` and ``prev_article_in_category``.
Usage
-----
.. code-block:: html+jinja
<ul>
{% if article.prev_article %}
<li>
<a href="{{ SITEURL }}/{{ article.prev_article.url}}">
{{ article.prev_article.title }}
</a>
</li>
{% endif %}
{% if article.next_article %}
<li>
<a href="{{ SITEURL }}/{{ article.next_article.url}}">
{{ article.next_article.title }}
</a>
</li>
{% endif %}
</ul>
<ul>
{% if article.prev_article_in_category %}
<li>
<a href="{{ SITEURL }}/{{ article.prev_article_in_category.url}}">
{{ article.prev_article_in_category.title }}
</a>
</li>
{% endif %}
{% if article.next_article %}
<li>
<a href="{{ SITEURL }}/{{ article.next_article_in_category.url}}">
{{ article.next_article_in_category.title }}
</a>
</li>
{% endif %}
</ul>
Usage with the Subcategory plugin
---------------------------------
If you want to get the neigbors within a subcategory it's a little different.
Since an article can belong to more than one subcategory, subcategories are
stored in a list. If you have an article with subcategories like
``Category/Foo/Bar``
it will belong to both subcategory Foo, and Foo/Bar. Subcategory neighbors are
added to an article as ``next_article_in_subcategory#`` and
``prev_article_in_subcategory#`` where ``#`` is the level of subcategory. So using
the example from above, subcategory1 will be Foo, and subcategory2 Foo/Bar.
Therefor the usage with subcategories is:
.. code-block:: html+jinja
<ul>
{% if article.prev_article_subcategory1 %}
<li>
<a href="{{ SITEURL }}/{{ article.prev_article_in_subcategory1.url}}">
{{ article.prev_article_in_subcategory1.title }}
</a>
</li>
{% endif %}
{% if article.next_article %}
<li>
<a href="{{ SITEURL }}/{{ article.next_article_subcategory1.url}}">
{{ article.next_article_subcategory1.title }}
</a>
</li>
{% endif %}
</ul>
<ul>
{% if article.prev_article_in_subcategory2 %}
<li>
<a href="{{ SITEURL }}/{{ article.prev_article_in_subcategory2.url}}">
{{ article.prev_article_in_subcategory2.title }}
</a>
</li>
{% endif %}
{% if article.next_article %}
<li>
<a href="{{ SITEURL }}/{{ article.next_article_in_subcategory2.url}}">
{{ article.next_article_in_subcategory2.title }}
</a>
</li>
{% endif %}
</ul>
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