File gl-mr470-introduce-feed-filtering.patch of Package python-HyperKitty

diff --git a/hyperkitty/feed.py b/hyperkitty/feed.py
index 8242662c2158be7b34527cf933565588892ce25f..a9bd9ae546aa51f717b07b6c270b769e9e8c775f 100644
--- a/hyperkitty/feed.py
+++ b/hyperkitty/feed.py
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License along with
 # HyperKitty.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Author: Stasiek Michalski <stasiek@michalski.cc>
+# Author: Jacob Michalskie <jacob@michalskie.cc>
 #
 import re
 
@@ -43,20 +43,32 @@ def sanitize(x):
 class MailingListFeed(Feed):
 
     def get_object(self, request, mlist_fqdn):
-        return get_object_or_404(MailingList, name=mlist_fqdn)
+        return {'mlist': get_object_or_404(MailingList, name=mlist_fqdn),
+                'params': request.GET}
 
     def title(self, obj):
-        return sanitize(obj.display_name)
+        return sanitize(obj['mlist'].display_name)
 
     def link(self, obj):
-        return reverse("hk_list_overview", kwargs={"mlist_fqdn": obj.name})
+        return reverse("hk_list_overview",
+                       kwargs={"mlist_fqdn": obj['mlist'].name})
 
     def description(self, obj):
-        return sanitize(obj.description)
+        return sanitize(obj['mlist'].description)
 
     def items(self, obj):
         len = getattr(settings, 'HYPERKITTY_MLIST_FEED_LENGTH', 30)
-        return Email.objects.filter(mailinglist=obj).order_by('-date')[:len]
+        emails = Email.objects.filter(mailinglist=obj['mlist'])
+        if 'subject' in obj['params']:
+            emails = emails.filter(subject__regex=obj['params']['subject'])
+        if 'sender' in obj['params']:
+            emails = emails.filter(sender_name__regex=obj['params']['email'])
+        if 'threads' in obj['params']:
+            emails = emails.filter(thread_depth=0)
+        if 'limit' in obj['params']:
+            if int(obj['params']['limit']) < len:
+                len = int(obj['params']['limit'])
+        return emails.order_by('-date')[:len]
 
     def item_title(self, item):
         return sanitize(item.subject)