gistfile1.txt

def merge(url):
    full_url=[]
    for i, el in enumerate(url):
        if i%2==0:    
            full_url.append(el)
    full_url = ''.join(full_url)
    return full_url
    
def combineflatten(seq):
    items= tuple(item for item in seq if not isinstance(item, tuple))
    yield items
    for item in seq:
            if isinstance(item, tuple):
                for yielded in combineflatten(item):
                    yield items+yielded
                    
def generate_flat_urls(tree_urls):
    """
    >>> tree_urls = ('', 'list',
    ...     ('edit/', 'edit', ('auto/', 'edit_auto')),
    ...     ('^add/', 'add'),
    ...     ('delete/', 'delete', ('delete/', 'delete_hard'))
    ...     )

    >>> generate_flat_urls(tree_urls)
    [('^$', 'list'), ('^edit/$', 'edit'), ('^edit/auto/$', 'edit_auto'), ('^^add/$', 'add'), ('^delete/$', 'delete'), ('^delete/delete/$', 'delete_hard')]
    """
    return [('^%s$'%merge(el), el[-1]) for el in tuple(combineflatten(tree_urls))]
    
from django.shortcuts import render_to_response

def render_with_auth_check(request, payload, request_context, *args, **kwrags):
    for el in payload.itervalues():
        try:
            has_auth = el.check_auth(request.user)
            if not has_auth:
                raise AuthFailException
        except ValueError:
            pass #Not all objects have check_auth
    return render_to_response(request, payload, request_context, *args, **kwrags)
        
class AuthFailHandlerMiddleware:
    def process_exception(self, request, exception):
        if type(exception) == AuthFailException:
            return render_to_response('accounts/login/', {}, RequestContext(request))
            
def render_jinja_to_response(template_name, payload):
    #This should probably go in settings.py
    from jinja2 import Environment, PackageLoader
    env = Environment(loader=PackageLoader('yourapplication', 'templates'))
    template = env.get_template(template_name)
    response = template.render(**payload)
    return HttpResponse(response)