--- trac/web/main.py	Mon Jul 21 01:44:40 2008 -0700
+++ trac/web/main.py	Sat Jul 26 00:50:24 2008 -0700
@@ -345,6 +345,18 @@
             # environment
             path_info = environ.get('PATH_INFO', '').lstrip('/').split('/')
             env_name = path_info.pop(0)
+            
+            if len(path_info) and path_info[0] == 'p':
+                path_info.pop(0) # pop off the p
+                env_parent_dir = os.path.join(env_parent_dir, env_name, 'projects')
+                environ['trac.env_parent_dir'] = env_parent_dir
+                parent_env = env_name
+                if len(path_info):
+                    env_name = path_info.pop(0)
+                else:
+                    env_name = None
+            else:
+                parent_env = None
 
             if not env_name:
                 # No specific environment requested, so render an environment
@@ -356,7 +368,10 @@
             # To make the matching patterns of request handlers work, we append
             # the environment name to the `SCRIPT_NAME` variable, and keep only
             # the remaining path in the `PATH_INFO` variable.
-            environ['SCRIPT_NAME'] = Href(environ['SCRIPT_NAME'])(env_name)
+            if parent_env:
+                environ['SCRIPT_NAME'] = Href(environ['SCRIPT_NAME'])(parent_env, 'p', env_name)
+            else:
+                environ['SCRIPT_NAME'] = Href(environ['SCRIPT_NAME'])(env_name)
             environ['PATH_INFO'] = '/' + '/'.join(path_info)
 
             if env_parent_dir: