bulma/docs/_includes/docs/components/pagination.html

{% assign current_link_id = page.breadcrumb | last %}

{% assign current_category_index = page.breadcrumb | size | minus: 2 %}
{% assign current_category_id = page.breadcrumb[current_category_index] %}

{% assign same_category_ids = site.data.links.categories[current_category_id] %}
{% assign category_size = same_category_ids | size %}
{% assign last_index = category_size | minus: 1 %}

{% for category_id in site.data.links.pagination_category_ids %}
  {% if category_id == current_category_id %}
    {% assign prev_category_index = forloop.index0 | minus: 1 %}
    {% assign next_category_index = forloop.index0 | plus: 1 %}
  {% endif %}
{% endfor %}

{% for link_id in same_category_ids %}
  {% if link_id == current_link_id %}
    {% assign prev_index = forloop.index0 | minus: 1 %}
    {% assign next_index = forloop.index0 | plus: 1 %}
  {% endif %}
{% endfor %}

<!-- Previous link -->
<!-- If first index in list -->
{% if prev_index == -1 %}
  {% assign prev_category_id = site.data.links.pagination_category_ids[prev_category_index] %}
  {% assign prev_category_links = site.data.links.categories[prev_category_id] %}
  {% assign prev_category_size = prev_category_links | size %}
  {% assign prev_last_index = prev_category_size | minus: 1 %}
  {% assign prev_link_id = prev_category_links[prev_last_index] %}
{% else %}
  {% assign prev_category_id = current_category_id %}
  {% assign prev_link_id = same_category_ids[prev_index] %}
{% endif %}

<!-- Next link -->
<!-- If last index in list -->
{% if next_index == category_size %}
  {% assign next_category_id = site.data.links.pagination_category_ids[next_category_index] %}
  {% assign next_category_ = site.data.links.categories[next_category_id] %}
  {% assign next_link_id = next_category_[0] %}
{% else %}
  {% assign next_category_id = current_category_id %}
  {% assign next_link_id = same_category_ids[next_index] %}
{% endif %}

{% assign prev_theme = prev_category_id %}
{% assign next_theme = next_category_id %}

{% assign library_category_ids = 'columns,components,elements,form,layout' | split: ',' %}

{% if library_category_ids contains prev_category_id %}
  {% assign prev_theme = 'library' %}
{% endif %}

{% if library_category_ids contains next_category_id %}
  {% assign next_theme = 'library' %}
{% endif %}

{% unless page.hide_pagination %}
  {% if prev_link_id or next_link_id %}
    <nav class="bd-docs-pagination bd-pagination-links">
      {% if prev_link_id %}
        {% assign prev_link = site.data.links.by_id[prev_link_id] %}
        <a
          class="bd-pagination-button bd-pagination-prev bd-theme-{{ prev_theme }}"
          href="{{ site.url }}{{ prev_link.path }}"
          title="{{ prev_link.name }}"
        >
          <i>←</i>
          <span>
            <em>{{ prev_category_id }}:</em>
            <strong>{{ prev_link.name }}</strong>
          </span>
        </a>
      {% endif %}

      {% if next_link_id %}
        {% assign next_link = site.data.links.by_id[next_link_id] %}
        <a
          class="bd-pagination-button bd-pagination-next bd-theme-{{ next_theme }}"
          href="{{ site.url }}{{ next_link.path }}"
          title="{{ next_link.name }}"
        >
          <span>
            <em>{{ next_category_id }}:</em>
            <strong>{{ next_link.name }}</strong>
          </span>
          <i>→</i>
        </a>
      {% endif %}
    </nav>
  {% endif %}
{% endunless %}