a really crap set of template filters for django pagination rather than subclassing and mod'ing it

crappy_page_filters.py

"""
Usage info:

Slap this file in a templatetags subdirectory off one of your apps:

In a template:

{% load crappy_page_filters %}

Then... given a situation like you were dealing with Haystack (and Twitter Boostrap style CSS)
you could do something like this in your template to provide page number links and info:

<div class="pagination">
<ul>
    <li class="prev {% if not page.has_previous %}disabled{% endif %}"><a href="?q={{ query }}&amp;page={% if page.has_previous %}{{ page.previous_page_number }}{% else %}{{ page.number }}{% endif %}">&laquo; Previous</a></li>
    {% for p in page.paginator.page_range|crappy_pages:page.number %}
        <li class="{% if p == page.number %}active{% endif %} {% if "..." in p %}disabled{% endif %}"><a href="?q={{ query }}&amp;page={{ p|crappy_pages_link:page.number }}">{{ p|crappy_pages_elli|safe }}</a></li>
    {% endfor %}
    <li class="next {% if not page.has_next %}disabled{% endif %}"><a href="?q={{ query }}&amp;page={% if page.has_next %}{{ page.next_page_number }}{% else %}{{ page.number }}{% endif %}">Next &raquo;</a></li>
</ul>
</div>

Here the page context variable is a specific paginator page... Haystack style.

Not sure why I did this other than I didn't want to take in someone else's but yet I was in a hurry...

"""

from django import template

register = template.Library()


@register.filter
def crappy_pages(value,current_page,max_pages=8):
    """
    4 scenarios:
      1 - the number of pages is less than the max... just return the range untouched
      2 - the current page is within the max number, so we're going to return the range starting at page 1 and add ...
      3 - the current page is not within max_pages of the beginning, but within max_pages of the end so prepend ...
      4 - the current page is in the middle of a bunch of page numbers...
    """
    if value is not None:
        page_range = value[:]
    else:
        page_range = []
    if len(page_range) > max_pages:
        if current_page - max_pages < 0:
            new_range = page_range[0:max_pages]
            new_range.extend(['...',page_range[-1]])
        elif current_page + max_pages > len(page_range):
            new_range = ['1','1...']
            new_range.extend(page_range[-max_pages:])
        else:
            new_range = ['1','1...']
            new_range.extend(page_range[ (current_page - (max_pages / 2)):(current_page + (max_pages / 2))])
            new_range.extend(['...',page_range[-1]])
        return new_range
    else:
        return page_range

@register.filter
def crappy_pages_elli(value):
    if value == '...' or value == '1...':
        return '&hellip;'
    return value

@register.filter
def crappy_pages_link(value,default=''):
    if value == '...':
        return default
    elif value == '1...':
        return default
    else:
        return value