X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/b148ca4096bd2154e3c9b2d9f1cda7ef31c346db..321d33f3b2ffa277913e3c3277a417ecd17e53f2:/contrib/penfield/utils.py

diff --git a/contrib/penfield/utils.py b/contrib/penfield/utils.py
index 89d01a7..0386d38 100644
--- a/contrib/penfield/utils.py
+++ b/contrib/penfield/utils.py
@@ -1,66 +1,99 @@
-from django.core.paginator import Paginator, EmptyPage
+from django.utils.feedgenerator import Atom1Feed, Rss201rev2Feed
+from django.conf.urls.defaults import url, patterns
+from django.contrib.sites.models import Site
+from django.core.urlresolvers import reverse
+from django.http import HttpResponse
+from philo.utils import paginate
 
 
-class PaginationProxy(object):
-	def __init__(self, paginator=None, page=None, objects=None):
-		self.paginator = paginator
-		self.page = page
-		self.objects = objects
+class FeedMultiViewMixin(object):
+	"""
+	This mixin provides common methods for adding feeds to multiviews. In order to use this mixin,
+	the multiview must define feed_title (probably as properties that return values
+	on related objects.) feed_description may also be defined; it defaults to an empty string.
+	"""
+	feed_suffix = 'feed'
+	feeds_enabled = True
+	atom_feed = Atom1Feed
+	rss_feed = Rss201rev2Feed
+	feed_title = None
+	feed_description = None
+	list_var = 'objects'
 	
-	@property
-	def page_range(self):
-		if not self.paginator:
-			return None
-		
-		return self.paginator.page_range
+	def page_view(self, func, page):
+		"""
+		Wraps an object-fetching function and renders the results as a page.
+		"""
+		def inner(request, extra_context=None, **kwargs):
+			objects, extra_context = func(request=request, extra_context=extra_context, **kwargs)
+
+			context = self.get_context()
+			context.update(extra_context or {})
+
+			if 'page' in kwargs or 'page' in request.GET or (hasattr(self, 'per_page') and self.per_page):
+				page_num = kwargs.get('page', request.GET.get('page', 1))
+				paginator, paginated_page, objects = paginate(objects, self.per_page, page_num)
+				context.update({'paginator': paginator, 'paginated_page': paginated_page, self.list_var: objects})
+			else:
+				context.update({self.list_var: objects})
+
+			return page.render_to_response(request, extra_context=context)
+
+		return inner
 	
-	@property
-	def num_pages(self):
-		if not self.paginator:
-			return None
-		
-		return self.paginator.num_pages
+	def feed_view(self, func, reverse_name):
+		"""
+		Wraps an object-fetching function and renders the results as a rss or atom feed.
+		"""
+		def inner(request, extra_context=None, **kwargs):
+			objects, extra_context = func(request=request, extra_context=extra_context, **kwargs)
 	
-	@property
-	def page_number(self):
-		if not self.page:
-			return None
-		
-		return self.page.number
+			if 'HTTP_ACCEPT' in request.META and 'rss' in request.META['HTTP_ACCEPT'] and 'atom' not in request.META['HTTP_ACCEPT']:
+				feed_type = 'rss'
+			else:
+				feed_type = 'atom'
+			
+			current_site = Site.objects.get_current()
+			#Could this be done with request.path instead somehow?
+			feed_kwargs = {
+				'link': 'http://%s/%s/%s/' % (current_site.domain, request.node.get_absolute_url().strip('/'), reverse(reverse_name, urlconf=self, kwargs=kwargs).strip('/'))
+			}
+			feed = self.get_feed(feed_type, extra_context, feed_kwargs)
+			
+			for obj in objects:
+				kwargs = {
+					'link': 'http://%s/%s/%s/' % (current_site.domain, request.node.get_absolute_url().strip('/'), self.get_subpath(obj).strip('/'))
+				}
+				self.add_item(feed, obj, kwargs=kwargs)
 	
-	# Why doesn't this work?
-	#def __bool__(self):
-	#	return bool(self.paginator)
-
+			response = HttpResponse(mimetype=feed.mime_type)
+			feed.write(response, 'utf-8')
+			return response
 
-def paginate(objects, per_page=None, page_number=1):
-	"""
-	Given a list of objects, return a (page, obj_list) tuple.
-	"""
-	try:
-		per_page = int(per_page)
-	except (TypeError, ValueError):
-		# Then either it wasn't set or it was set to an invalid value
-		return PaginationProxy(objects=objects)
+		return inner
 	
-	# There also shouldn't be pagination if the list is too short. Try count()
-	# first - good chance it's a queryset, where count is more efficient.
-	try:
-		if objects.count() <= per_page:
-			return PaginationProxy(objects=objects)
-	except AttributeError:
-		if len(objects) <= per_page:
-			return PaginationProxy(objects=objects)
-	
-	paginator = Paginator(objects, per_page)
-	try:
-		page_number = int(page_number)
-	except:
-		page_number = 1
+	def get_feed(self, feed_type, extra_context, kwargs=None):
+		defaults = {
+			'description': ''
+		}
+		defaults.update(kwargs or {})
+		
+		if feed_type == 'rss':
+			return self.rss_feed(**defaults)
+		
+		if 'description' in defaults and defaults['description'] and 'subtitle' not in defaults:
+			defaults['subtitle'] = defaults['description']
+		
+		return self.atom_feed(**defaults)
 	
-	try:
-		page = paginator.page(page_number)
-	except EmptyPage:
-		page = None
+	def feed_patterns(self, object_fetcher, page, base_name):
+		feed_name = '%s_feed' % base_name
+		urlpatterns = patterns('',
+			url(r'^%s/$' % self.feed_suffix, self.feed_view(object_fetcher, feed_name), name=feed_name),
+			url(r'^$', self.page_view(object_fetcher, page), name=base_name)
+		)
+		return urlpatterns
 	
-	return PaginationProxy(paginator, page, objects)
\ No newline at end of file
+	def add_item(self, feed, obj, kwargs=None):
+		defaults = kwargs or {}
+		feed.add_item(**defaults)
\ No newline at end of file