Neighbor Articles: A Plugin for Pelican

Neighbors is a Pelican plugin that adds Next/Previous links to articles.

Installation

This plugin can be installed via:

python -m pip install pelican-neighbors

Usage

This plugin adds a couple of new variables to the article's context:

• next_article (newer)
• prev_article (older)
• next_article_in_category
• prev_article_in_category
• next_article_in_subcategory#
• prev_article_in_subcategory#

Here is an example on how to add article navigation in your Jinja article.html template:

<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_in_category %}
        <li>
            <a href="{{ SITEURL }}/{{ article.next_article_in_category.url}}">
                {{ article.next_article_in_category.title }}
            </a>
        </li>
    {% endif %}
</ul>

More Categories plugin support

You can use the Neighbors plugin with the More Categories plugin.

Since an article can belong to more than one subcategory, subcategories are stored in a list. If you have an article with subcategories like foo/bar/baz, it will belong to both subcategory bar and bar/baz.

Subcategory neighbors are added to an article as next_article_in_subcategory# and prev_article_in_subcategory#, where # is the level of subcategory.

Using the example above:

• subcategory0 is foo
• subcategory1 will be foo/bar
• subcategory2 will be foo/bar/baz

Subcategory plugin support

You can use the Neighbors plugin in conjunction with the Subcategory plugin.

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 will be Foo/Bar.

Template Examples

The usage with subcategories from either the Subcategory plugin or the More Categories plugin is:

<ul>
    {% if article.prev_article_in_subcategory1 %}
        <li>
            <a href="{{ SITEURL }}/{{ article.prev_article_in_subcategory1.url}}">
                {{ article.prev_article_in_subcategory1.title }}
            </a>
        </li>
    {% endif %}
    {% if article.next_article_in_subcategory1 %}
        <li>
            <a href="{{ SITEURL }}/{{ article.next_article_in_subcategory1.url}}">
                {{ article.next_article_in_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_in_subcategory2 %}
        <li>
            <a href="{{ SITEURL }}/{{ article.next_article_in_subcategory2.url}}">
                {{ article.next_article_in_subcategory2.title }}
            </a>
        </li>
    {% endif %}
</ul>

Limitations

If an article has multiple categories, only the first category is considered.

Contributing

Contributions are welcome and much appreciated. Every little bit helps. You can contribute by improving the documentation, adding missing features, and fixing bugs. You can also help out by reviewing and commenting on existing issues.

To start contributing to this plugin, review the Contributing to Pelican documentation, beginning with the Contributing Code section.