feat: Allow styling of RSS feed

src/fellchensammlung/feeds.py

@@ -1,10 +1,31 @@
 from django.contrib.syndication.views import Feed
+from django.utils.feedgenerator import Rss201rev2Feed
 
 from django.urls import reverse
+from django.utils.xmlutils import SimplerXMLGenerator
+
 from .models import AdoptionNotice
 
 
+class FormattedFeed(Rss201rev2Feed):
+    """
+
+    """
+    content_type = "text/xml; charset=utf-8"
+    def write(self, outfile, encoding):
+        handler = SimplerXMLGenerator(outfile, encoding, short_empty_elements=True)
+        handler.startDocument()
+        handler._write('<?xml-stylesheet href="/static/rss.xsl" type="text/xsl"?>')
+        handler.startElement("rss", self.rss_attributes())
+        handler.startElement("channel", self.root_attributes())
+        self.add_root_elements(handler)
+        self.write_items(handler)
+        self.endChannelElement(handler)
+        handler.endElement("rss")
+
+
 class LatestAdoptionNoticesFeed(Feed):
+    feed_type = FormattedFeed
     title = "Notfellchen"
     link = "/rss/"
     description = "Updates zu neuen Vermittlungen."
@@ -17,4 +38,3 @@ class LatestAdoptionNoticesFeed(Feed):
 
     def item_description(self, item):
         return item.description
-