From 947067637053fd519f4a3608bd228c2399d047df Mon Sep 17 00:00:00 2001
From: Erik Stein <erik@classlibrary.net>
Date: Mon, 24 Dec 2018 10:39:40 +0100
Subject: [PATCH] dispatch_slug_path.

---
 CHANGES                     |  1 +
 shared/utils/url_helpers.py | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 shared/utils/url_helpers.py

diff --git a/CHANGES b/CHANGES
index 26e974c..4a46d3d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,4 @@
+- Added dispatch_slug_path.
 0.2.17 2018-12-17
 - PageTitlesMixin: Slimdown name for get_short_title.
 - Daytime utils.
diff --git a/shared/utils/url_helpers.py b/shared/utils/url_helpers.py
new file mode 100644
index 0000000..ad4b438
--- /dev/null
+++ b/shared/utils/url_helpers.py
@@ -0,0 +1,33 @@
+from django.http import Http404
+
+
+def dispatch_slug_path(*views):
+    """
+    Dispatch full path slug in iterating through a set of views.
+    Http404 exceptions raised by a view lead to trying the next view
+    in the list.
+
+    This allows to plug different slug systems to the same root URL.
+
+    Usages::
+
+        # in urls.py
+        path('<slug:slug_path>/', dispatch_slug_path(
+            views.CategoryDetailView.as_view(),
+            views.ArticleDetailView.as_view())),
+        )
+    """
+    def wrapper(request, slug_path):
+        args = []
+        kwargs = {'slug_path': slug_path}
+
+        not_found_exception = Http404
+        for view in views:
+            try:
+                return view(request, *args, **kwargs)
+            except Http404 as e:
+                not_found_exception = e  # assign to use it outside of except block
+                continue
+        raise not_found_exception
+
+    return wrapper