Refactor how the routing for different kinds of entry works - this will make implementing webmentions easier, hopefully?

entries/urls.py

@@ -1,4 +1,5 @@
 from django.conf.urls import url
+from django.urls import reverse
 from . import kinds
 from .views import feeds, lists, perma
 from lemoncurry import breadcrumbs as crumbs
@@ -12,29 +13,39 @@ def prefix(route):
     return app_name + ':' + route
 
 
-page = '(?:/page/(?P<page>\d+))?'
+id = r'/(?P<id>\d+)'
+kind = r'(?P<kind>{0})'.format('|'.join(k.plural for k in kinds.all))
+page = r'(?:/page/(?P<page>\d+))?'
 slug = r'/(?P<slug>[^/]+)'
 
+slug_opt = '(?:' + slug + ')?'
+
 app_name = 'entries'
-urlpatterns = [
+urlpatterns = (
     url('^atom$', feeds.AtomHomeEntries(), name='atom'),
     url('^rss$', feeds.RssHomeEntries(), name='rss'),
     url(to_pat('cats', slug, page), lists.by_cat, name='cat'),
-]
+    url(to_pat(kind, page), lists.by_kind, name='index'),
+    url(to_pat(kind, '/atom'), feeds.AtomByKind(), name='atom_by_kind'),
+    url(to_pat(kind, '/rss'), feeds.RssByKind(), name='rss_by_kind'),
+    url(to_pat(kind, id, slug_opt, '/amp'), perma.entry_amp, name='entry_amp'),
+    url(to_pat(kind, id, slug_opt), perma.entry, name='entry'),
+)
+
+
+class IndexCrumb(crumbs.Crumb):
+    def __init__(self):
+        super().__init__(prefix('index'), parent='home:index')
+
+    @property
+    def label(self):
+        return self.match.kwargs['kind']
+
+    @property
+    def url(self):
+        return reverse(prefix('index'), kwargs={'kind': self.label})
+
+
 crumbs.add(prefix('cat'), parent='home:index')
-
-slug = '(?:' + slug + ')?'
-
-for k in kinds.all:
-    kind = k.plural
-    id = r'/(?P<id>\d+)'
-    urlpatterns += (
-        url(to_pat(kind, page), lists.by_kind, 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, '/amp'), perma.entry_amp, name=k.entry_amp),
-        url(to_pat(kind, id, slug), perma.entry, name=k.entry),
-    )
-
-    crumbs.add(prefix(k.index), label=k.plural, parent='home:index')
-    crumbs.add(prefix(k.entry), parent=prefix(k.index))
+crumbs.add(IndexCrumb())
+crumbs.add(prefix('entry'), parent=prefix('index'))