Implement simple deprecated ical feed

Always has events for the next week, starting at 13:37

website/events/feeds.py

+from datetime import datetime, timedelta
+
 from django.urls import reverse
 from django.utils.translation import activate
 from django_ical.views import ICalFeed
@@ -40,3 +42,30 @@ class EventFeed(ICalFeed):
 
     def item_location(self, item):
         return "{} - {}".format(item.location, item.map_location)
+
+
+class DeprecationFeed(ICalFeed):
+    def product_id(self):
+        return '-//thalia.nu//DEPRECATED'
+
+    def items(self):
+        return range(7)
+
+    def item_start_datetime(self, item):
+        today = datetime.now().replace(hour=13, minute=37, second=0)
+        delta = timedelta(days=item)
+        return today + delta
+
+    def item_end_datetime(self, item):
+        today = datetime.now().replace(hour=15, minute=37, second=0)
+        delta = timedelta(days=item)
+        return today + delta
+
+    def item_title(self, item):
+        return (
+            'Oude Thalia Feed, gebruik https://thalia.nu/' +
+            reverse('events:ical-nl')
+        )
+
+    def item_link(self, item):
+        return reverse('events:ical-nl') + '?item={}'.format(item)

website/thaliawebsite/urls.py

@@ -23,6 +23,7 @@ from django.contrib.sitemaps.views import sitemap
 from django.views.generic import TemplateView
 from django.views.i18n import JavaScriptCatalog
 
+from events.feeds import DeprecationFeed
 from utils.views import private_thumbnails
 import members
 
@@ -49,6 +50,7 @@ urlpatterns = [
     url(r'^members/', include('members.urls', namespace='members')),
     url(r'^nyi$', TemplateView.as_view(template_name='status/nyi.html'), name='#'),
     url(r'^events/', include('events.urls', namespace='events')),
+    url(r'^index\.php/events/ical/feed\.ics', DeprecationFeed()),
     url(r'^newsletters/', include('newsletters.urls',
                                   namespace='newsletters')),
     url(r'^association$', TemplateView.as_view(