Fix WorkingSet yielding the same distribution more than once if more than

one path entry points to it.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041182

api_tests.txt

@@ -192,6 +192,7 @@ optional second parameter to ``add()``
 But even if a distribution is found under multiple path entries, it still only
 shows up once when iterating the working set:
 
+    >>> ws.add_entry(ws.entries[0])
     >>> list(ws)
     [Bar 0.9 (http://example.com/something)]
 

pkg_resources.py

@@ -367,16 +367,6 @@ class WorkingSet(object):
 
 
 
-    def __iter__(self):
-        """Yield distributions for non-duplicate projects in the working set
-
-        The yield order is the order in which the items' path entries were
-        added to the working set.
-        """
-        for item in self.entries:
-            for key in self.entry_keys[item]:
-                yield self.by_key[key]
-
     def find(self, req):
         """Find a distribution matching requirement `req`
 
@@ -408,6 +398,29 @@ class WorkingSet(object):
             elif name in entries:
                 yield entries[name]
 
+
+
+
+
+
+
+
+
+
+
+    def __iter__(self):
+        """Yield distributions for non-duplicate projects in the working set
+
+        The yield order is the order in which the items' path entries were
+        added to the working set.
+        """
+        seen = {}
+        for item in self.entries:
+            for key in self.entry_keys[item]:
+                if key not in seen:
+                    seen[key]=1
+                    yield self.by_key[key]
+
     def add(self, dist, entry=None):
         """Add `dist` to working set, associated with `entry`
 
@@ -431,24 +444,11 @@ class WorkingSet(object):
 
         self.by_key[dist.key] = dist
         keys = self.entry_keys[entry]
-
         if dist.key not in keys:
             keys.append(dist.key)
 
         self._added_new(dist)
 
-
-
-
-
-
-
-
-
-
-
-
-
     def resolve(self, requirements, env=None, installer=None):
         """List all distributions needed to (recursively) meet `requirements`