Breadcrumbs

[Thomas Guettler]

Hi,

I developed this method to create breadcrumbs.

What do you think about it?

 Thomas

# Python
from urlparse import urljoin

# Django
from django import http
from django.core import urlresolvers
from django.core.urlresolvers import reverse
from django.conf import settings
from django.utils.http import urlquote

'''
Simple Breadcrumbs for Django:

The value of request.path gets examined and all views of the'upper' urls
need to have an attribute 'breadcrumbs'. They get added to the list of 
breadcrumbs. The attribute can be a
string or a method. If it is a method it needs to accept two arguments
(args and kwargs) which correspond to the arguments of the view.

Example: request.path == '/users/foo/settings/'

Views:

def settings(request, ...):
    ...
settings.breadcrumbs=u'Settings'

def user(request, username):
    ...
user.breadcrumbs=lambda args, kwargs: args[1]

def users(request):
    ...
users.breadcrumbs='Users'


Breadcrumbs:

Users>>foo>Settings

All except the last breadcrumb will be links the views.

Implemented with resolve(url)
'''
def get_breadcrumbs(request):
    url=request.path
    breadcrumbs=[]
    urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF)
    resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
    while url:
        callback=None
        try:
            callback, callback_args, callback_kwargs = resolver.resolve(url)
        except http.Http404, e:
            pass
        else:
            bc=getattr(callback, 'breadcrumbs', None)
            assert bc!=None, u'Callback %s.%s function breadcrumbs does not 
exist.' % (
                callback.__module__, callback.__name__)
            if not isinstance(bc, basestring):
                bc=bc(callback_args, callback_kwargs)
            if url!=request.path:
                bc=u'<a href="%s">%s</a>' % (
                    urlquote(url), bc)
            breadcrumbs.append(bc)

        # Parent URL heraussuchen.
        url=urljoin(url, '..')
        if url=='/':
            break
    if not breadcrumbs:
        return ''
    breadcrumbs.append('')
    breadcrumbs.reverse()
    return u'<div class="breadcrumbs">%s</div>' % ('&gt;&gt;'.join(breadcrumbs))

def test_all_views():
    u'''
    Unittest: Check if all you views have a breadcrumbs()
    attribute.

    Django views are ignored.
    '''
    urlconf=settings.ROOT_URLCONF
    resolver=urlresolvers.RegexURLResolver(r'^/', urlconf)
    missing=[]
    for function, patterns in resolver.reverse_dict.items():
        if not function:
            continue
        sub_resolver=patterns[0]
        if function.__module__.startswith('django'):
            continue
        name='%s.%s' % (function.__module__, function.__name__)
        if not hasattr(function, 'breadcrumbs'):
            missing.append(name)
        bc=function.breadcrumbs
        if isinstance(bc, basestring):
            try:
                unicode(bc)
            except UnicodeError, exc:
                missing.append('UnicodeError, %s: %s' % (name, exc))
    missing.sort()
    assert not missing, 'Missing breadcumbs function: %s' % (missing)


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