Merge pull request #332 from SteelyWing/patch-2

Use abs path for cache key

jinja2/environment.py

@@ -757,14 +757,23 @@ def join_path(self, template, parent):
     def _load_template(self, name, globals):
         if self.loader is None:
             raise TypeError('no loader for this environment specified')
+        try:
+            # use abs path for cache key
+            cache_key = self.loader.get_source(self, name)[1]
+        except RuntimeError:
+            # if loader does not implement get_source()
+            cache_key = None
+        # if template is not file, use name for cache key
+        if cache_key is None:
+            cache_key = name
         if self.cache is not None:
-            template = self.cache.get(name)
+            template = self.cache.get(cache_key)
             if template is not None and (not self.auto_reload or \
                                          template.is_up_to_date):
                 return template
         template = self.loader.load(self, name, globals)
         if self.cache is not None:
-            self.cache[name] = template
+            self.cache[cache_key] = template
         return template
 
     @internalcode