Template tag to add active class in navigation links

gistfile1.mustache

<!-- Specific path, only when visiting /accounts/ -->
<li class="{% active request "^/accounts/$" %}"><a href="/accounts/">Accounts</a></li>

<!-- Glob path, when visiting /blog/* example /blog/, /blog/post1/, /blog/post2/, /blog/post2/subitem/, ... -->
<li class="{% active request "^/blog/" %}"><a href="/blog/">Blog</a></li>

navigation.py

from django import template
register = template.Library()

@register.simple_tag
def active(request, pattern):
    import re
    if re.search(pattern, request.path):
        return 'active'
    return ''

settings.py

from django.conf.global_settings import TEMPLATE_CONTEXT_PROCESSORS

# Other settings...

TEMPLATE_CONTEXT_PROCESSORS += (
    'django.core.context_processors.request',
)

# Other settings...