A Django template tag for pagination

pagination.html

{% load i18n %}
<div class="row">
  <div class="col-xs-12">
    <section class="paginator text-center">
      <nav>
        <ul class="pagination">

          <li>
            {% if page.has_previous %}
              <a href="?page={{ page.previous_page_number }}" aria-label="Previous">
                <span aria-hidden="true"><i class="icon icon-chevron-left"> Anterior</i></span>
              </a>
            {% endif %}
          </li>

          {% for page_num in begin %}
            {% ifequal page.number page_num %}
            <li class="active">
              <a href="?page={{ page_num }}">{{ page_num }}</a>
            </li>
            {% else %}
            <li>
              <a href="?page={{ page_num }}">{{ page_num }}</a>
            </li>
            {% endifequal %}
          {% endfor %}

          {% if middle %}
            <li>
              <a>...</a>
            </li>
            {% for page_num in middle %}
              {% ifequal page.number page_num %}
                <li class="active">
                  <a href="?page={{ page_num }}">{{ page_num }}</a>
                </li>
              {% else %}
                <li>
                  <a href="?page={{ page_num }}">{{ page_num }}</a>
                </li>
              {% endifequal %}
            {% endfor %}
          {% endif %}

          {% if end %} 
            <li>
              <a>...</a>
            </li>
            {% for page_num in end %}
              {% ifequal page.number page_num %}
                <li class="active">
                  <a href="?page={{ page_num }}">{{ page_num }}</a>
                </li>
              {% else %}
                <li>
                  <a href="?page={{ page_num }}">{{ page_num }}</a>
                </li>
              {% endifequal %}
            {% endfor %}
          {% endif %} 

          <li>
            {% if page.has_next %}
              <a href="?page={{ page.next_page_number }}" aria-label="Next">
                <span aria-hidden="true">Siguiente <i class="icon icon-chevron-right"></i></span>
              </a>
            {% endif %}
          </li>

        </ul>
      </nav>
    </section>
  </div>
</div>

pagination.py

from django import template
from django.template import loader

register = template.Library()

@register.inclusion_tag('pagination.html')
def end_pagination(page, begin_pages=2, end_pages=2, before_current_pages=4, after_current_pages=4):
    """
    return google like pagination

    Usage::
        {% load end_tags %}
        {% end_pagination the_obj_to_paginate %}
    
    Example::
        {% end_pagination page_obj %}

    At this case page_obj is the defaul
    object for pages that django provide 

    """
    before = max(page.number - before_current_pages - 1, 0)
    after = page.number + after_current_pages

    begin = page.paginator.page_range[:begin_pages]
    middle = page.paginator.page_range[before:after]
    end = page.paginator.page_range[-end_pages:]
    last_page_number = end[-1]

    def collides(firstlist, secondlist):
        """ 
        Returns true if lists collides (have same entries)

        Example::
        >>> collides([1,2,3,4],[3,4,5,6,7])
        True
        >>> collides([1,2,3,4],[5,6,7])
        False
        """
        return any(item in secondlist for item in firstlist)

    # If middle and end has same entries, then end is what we want
    if collides(middle, end):
        end = range(max(last_page_number - before_current_pages - after_current_pages, 1), last_page_number + 1) #noqa
        middle = []

    # If begin and middle ranges has same entries, then begin is what we want
    if collides(begin, middle):
        begin = range(1, min(before_current_pages + after_current_pages, last_page_number) + 1) #noqa
        middle = []

    # If begin and end has the same entries then begin is what we want
    if collides(begin, end):
        begin = range(1, last_page_number + 1)
        end = []

    return {
            'page': page,
            'begin': begin,
            'middle': middle,
            'end': end
           }