Add package details redirect for package replacements

This makes sense if there is only one available replacement. We could
get more sophisticated and show the removed page if there are multiple
replacements available.

Additionally, automatically redirect if there was only one matching
package for a given package update deletion object.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/packages/views/display.py b/packages/views/display.py
index 1ea9ea4..d692231 100644
--- a/packages/views/display.py
+++ b/packages/views/display.py
@@ -51,12 +51,24 @@ def recently_removed_package(request, name, repo, arch, cutoff=CUTOFF):
         match = match.filter(created__gte=when)
     try:
         match = match.latest()
+        elsewhere = match.elsewhere()
+        if len(elsewhere) == 1:
+            return redirect(elsewhere[0])
         return render(request, 'packages/removed.html',
                 {'update': match, }, status=410)
     except Update.DoesNotExist:
         return None
 
 
+def replaced_package(request, name, repo, arch):
+    '''Check our package replacements to see if this is a package we used to
+    have but no longer do.'''
+    match = Package.objects.filter(replaces__name=name, repo=repo, arch=arch)
+    if len(match) == 1:
+        return redirect(match[0], permanent=True)
+    return None
+
+
 def redirect_agnostic(request, name, repo, arch):
     '''For arch='any' packages, we can issue a redirect to them if we have a
     single non-ambiguous option by changing the arch to match any arch-agnostic
@@ -95,7 +107,7 @@ def details(request, name='', repo='', arch=''):
         except Package.DoesNotExist:
             # attempt a variety of fallback options before 404ing
             options = (redirect_agnostic, split_package_details,
-                    recently_removed_package)
+                    recently_removed_package, replaced_package)
             for method in options:
                 ret = method(request, name, repo_obj, arch_obj)
                 if ret: