Highlight current page / app in Django

base.html

<ul class="nav navbar-nav">
    <li{% if app_name == 'pages' %} class="active"{% endif %}>
        <a href="{% url "page_list" %}">{% trans "Pages" %}</a>
    </li>
</ul>

context_processors.py

"""
Import this context processor in settings TEMPLATE_CONTEXT_PROCESSORS
"""

def resolver_context_processor(request):
    return {
        'app_name': request.resolver_match.app_name,
        'namespace': request.resolver_match.namespace,
        'url_name': request.resolver_match.url_name
    }

urls.py

from django.conf.urls import patterns, include, url
from django.contrib import admin

urlpatterns = patterns('',
    url(r'^pages/', include('pages.urls', app_name='pages')),
    url(r'^documents/', include('documents.urls', app_name='documents')),
    url(r'^admin/', include(admin.site.urls)),
)