Enable simple entry pagination - each h-feed page has a rel=next pointing to the next page of the feed, but there's no visible link yet

entries/urls.py

@@ -11,20 +11,24 @@ def prefix(route):
     return app_name + ':' + route
 
 
+before = '(?:/before/(?P<before>\d+))?'
+slug = r'/(?P<slug>[^/]+)'
+
 app_name = 'entries'
 urlpatterns = [
     url('^atom$', feeds.AtomHomeEntries(), name='atom'),
     url('^rss$', feeds.RssHomeEntries(), name='rss'),
-    url('^cats/(?P<slug>.+)$', views.cat, name='cat'),
+    url(to_pat('cats', slug, before), views.cat, name='cat'),
 ]
 crumbs.add(prefix('cat'), parent='home:index')
 
+slug = '(?:' + slug + ')?'
+
 for k in kinds.all:
     kind = k.plural
     id = r'/(?P<id>\d+)'
-    slug = r'(?:/(?P<slug>.+))?'
     urlpatterns += (
-        url(to_pat(kind), views.index, name=k.index, kwargs={'kind': k}),
+        url(to_pat(kind, before), views.index, name=k.index, kwargs={'kind': k}),
         url(to_pat(kind, '/atom'), feeds.AtomByKind(k), name=k.atom),
         url(to_pat(kind, '/rss'), feeds.RssByKind(k), name=k.rss),
         url(to_pat(kind, id, slug), views.entry, name=k.entry),

entries/views.py

@@ -1,13 +1,24 @@
 from annoying.decorators import render_to
 from django.shortcuts import get_object_or_404, redirect
+from django.urls import reverse
 from .models import Entry, Cat
 
 
 @render_to('entries/index.html')
-def index(request, kind):
+def index(request, kind, before=None):
     entries = Entry.objects.filter(kind=kind.id)
+    if before:
+        entries = entries.filter(id__lt=before)
+    entries = entries[:10]
+
+    next = None
+    if entries:
+        last = entries.last().id
+        next = reverse('entries:' + kind.index, kwargs={'before': last})
+
     return {
         'entries': entries,
+        'next': next,
         'atom': 'entries:' + kind.atom,
         'rss': 'entries:' + kind.rss,
         'title': kind.plural,
@@ -15,10 +26,22 @@ def index(request, kind):
 
 
 @render_to('entries/index.html')
-def cat(request, slug):
+def cat(request, slug, before=None):
     cat = get_object_or_404(Cat, slug=slug)
+    entries = cat.entries.all()
+    if before:
+        entries = entries.filter(id__lt=before)
+    entries = entries[:10]
+
+    next = None
+    if entries:
+        next = reverse('entries:cat', kwargs={
+            'slug': slug,
+            'before': entries.last().id
+        })
     return {
-        'entries': cat.entries.all(),
+        'entries': entries,
+        'next': next,
         'title': '#' + cat.name,
     }