{% macro render_pagination(pagination, pagination_window=2) %}
  {% set current = pagination.page %}
  {% set total = pagination.pages %}
  {% set window_start = [current - pagination_window, 1] | max %}
  {% set window_end = [current + pagination_window, total] | min %}
  <nav aria-label="Page navigation">
    <ol>
      <li>
        {% if pagination.has_prev %}
          <a href="{{ pagination.prev | url }}" aria-label="Previous page">❮</a>
        {% else %}
          <span aria-disabled="true">❮</span>
        {% endif %}
      </li>
      {% if window_start > 1 %}
        <li>
          <a href="{{ pagination.for_page(1) | url }}" aria-label="Page 1">1</a>
        </li>
        {% if window_start > 2 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
      {% endif %}
      {% for page_num in range(window_start, window_end + 1) %}
        <li>
          {% if page_num == current %}
            <a href="{{ pagination.for_page(page_num) | url }}" aria-current="page">{{ page_num }}</a>
          {% else %}
            <a href="{{ pagination.for_page(page_num) | url }}"
               aria-label="Page {{ page_num }}">{{ page_num }}</a>
          {% endif %}
        </li>
      {% endfor %}
      {% if window_end < total %}
        {% if window_end < total - 1 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
        <li>
          <a href="{{ pagination.for_page(total) | url }}"
             aria-label="Page {{ total }}">{{ total }}</a>
        </li>
      {% endif %}
      <li>
        {% if pagination.has_next %}
          <a href="{{ pagination.next | url }}" aria-label="Next page">❯</a>
        {% else %}
          <span aria-disabled="true">❯</span>
        {% endif %}
      </li>
    </ol>
  </nav>
{% endmacro %}

{% macro render_year_archive_navigation(
  current_year_page,
  archive_window=2
  ) %}
  {% set current_year = current_year_page.year %}
  {% set first_year_page = current_year_page.first_year_page %}
  {% set last_year_page = current_year_page.last_year_page %}
  {% set previous_year_page = current_year_page.previous_year_page %}
  {% set next_year_page = current_year_page.next_year_page %}
  {% set first_year = first_year_page.year %}
  {% set last_year = last_year_page.year %}
  {% set window_start = [current_year - archive_window, first_year] | max %}
  {% set window_end = [current_year + archive_window, last_year] | min %}
  <nav aria-label="Year archive navigation">
    <ol>
      <li>
        {% if previous_year_page %}
          <a href="{{ previous_year_page | url }}"
             rel="prev"
             aria-label="Previous year: {{ previous_year_page.year }}">❮</a>
        {% else %}
          <span aria-disabled="true">❮</span>
        {% endif %}
      </li>
      {% if window_start > first_year %}
        <li>
          <a href="{{ first_year_page | url }}" aria-label="Year {{ first_year }}">{{ first_year }}</a>
        </li>
        {% if window_start > first_year + 1 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
      {% endif %}
      {% for year in range(window_start, window_end + 1) %}
        {% set year_page = site.get(
                  '/blog@index-pages/year/{:04d}'.format(year)
                ) %}
        {% if year_page %}
          <li>
            {% if year == current_year %}
              <a href="{{ year_page | url }}" aria-current="page">{{ year }}</a>
            {% else %}
              <a href="{{ year_page | url }}" aria-label="Year {{ year }}">{{ year }}</a>
            {% endif %}
          </li>
        {% endif %}
      {% endfor %}
      {% if window_end < last_year %}
        {% if window_end < last_year - 1 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
        <li>
          <a href="{{ last_year_page | url }}" aria-label="Year {{ last_year }}">{{ last_year }}</a>
        </li>
      {% endif %}
      <li>
        {% if next_year_page %}
          <a href="{{ next_year_page | url }}"
             rel="next"
             aria-label="Next year: {{ next_year_page.year }}">❯</a>
        {% else %}
          <span aria-disabled="true">❯</span>
        {% endif %}
      </li>
    </ol>
  </nav>
{% endmacro %}

{% macro render_month_archive_navigation(
  current_month_page,
  archive_window=2
  ) %}
  {% set year_pages = index_pages('year') | sort(attribute='year') %}
  {% set ns = namespace(
      month_pages=[],
      current_position=none
    ) %}
  {% for year_page in year_pages %}
    {% set ns.month_pages = ns.month_pages + (year_page.subindexes | sort(attribute='month')) %}
  {% endfor %}
  {% for month_page in ns.month_pages %}
    {% if month_page.year == current_month_page.year
      and month_page.month == current_month_page.month %}
      {% set ns.current_position = loop.index0 %}
    {% endif %}
  {% endfor %}
  {% set total = ns.month_pages | length %}
  {% set current_position = ns.current_position %}
  {% set window_start = [current_position - archive_window, 0] | max %}
  {% set window_end = [current_position + archive_window, total - 1] | min %}
  {% set first_month_page = ns.month_pages[0] %}
  {% set last_month_page = ns.month_pages[total - 1] %}
  {% set previous_month_page = none %}
  {% set next_month_page = none %}
  {% if current_position > 0 %}
    {% set previous_month_page = ns.month_pages[current_position - 1] %}
  {% endif %}
  {% if current_position < total - 1 %}
    {% set next_month_page = ns.month_pages[current_position + 1] %}
  {% endif %}
  <nav aria-label="Monthly archive navigation">
    <ol>
      <li>
        {% if previous_month_page %}
          <a href="{{ previous_month_page | url }}"
             rel="prev"
             aria-label="Previous month: {{ previous_month_page.date | dateformat('yyyy-MM') }}">❮</a>
        {% else %}
          <span aria-disabled="true">❮</span>
        {% endif %}
      </li>
      {% if window_start > 0 %}
        <li>
          <a href="{{ first_month_page | url }}"
             aria-label="{{ first_month_page.date | dateformat('yyyy-MM') }}">
            {{ first_month_page.date | dateformat("MMMM y") }}
          </a>
        </li>
        {% if window_start > 1 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
      {% endif %}
      {% for position in range(window_start, window_end + 1) %}
        {% set month_page = ns.month_pages[position] %}
        <li>
          {% if position == current_position %}
            <a href="{{ month_page | url }}" aria-current="page">{{ month_page.date | dateformat("MMMM y") }}</a>
          {% else %}
            <a href="{{ month_page | url }}"
               aria-label="{{ month_page.date | dateformat('yyyy-MM') }}">
              {{ month_page.date | dateformat("MMMM y") }}
            </a>
          {% endif %}
        </li>
      {% endfor %}
      {% if window_end < total - 1 %}
        {% if window_end < total - 2 %}
          <li>
            <span aria-hidden="true">&hellip;</span>
          </li>
        {% endif %}
        <li>
          <a href="{{ last_month_page | url }}"
             aria-label="{{ last_month_page.date | dateformat('yyyy-MM') }}">
            {{ last_month_page.date | dateformat("MMMM y") }}
          </a>
        </li>
      {% endif %}
      <li>
        {% if next_month_page %}
          <a href="{{ next_month_page | url }}"
             rel="next"
             aria-label="Next month: {{ next_month_page.date | dateformat('yyyy-MM') }}">❯</a>
        {% else %}
          <span aria-disabled="true">❯</span>
        {% endif %}
      </li>
    </ol>
  </nav>
{% endmacro %}