Fixed a circular reference issue

ChangeLog

@@ -80,3 +80,4 @@
     * Added setcontents_async method to base
     * Added `appdirfs` module to abstract per-user application directories
     
+0.5:

fs/__init__.py

@@ -15,7 +15,7 @@ implementations of this interface such as:
 
 """
 
-__version__ = "0.4.0rc"
+__version__ = "0.4.1"
 __author__ = "Will McGugan (will@willmcgugan.com)"
 
 # No longer necessary - WM

fs/commands/runner.py

@@ -82,7 +82,7 @@ class Command(object):
         self.verbosity_level = 0
         self.terminal_colors = not sys.platform.startswith('win') and self.is_terminal()
         if self.is_terminal():
-            w, h = getTerminalSize()
+            w, _h = getTerminalSize()
             self.terminal_width = w
         else:
             self.terminal_width = 80

fs/mountfs.py

@@ -19,7 +19,7 @@ For example, lets say we have two filesystems containing config files and resour
 We can combine these filesystems in to a single filesystem with the following code::
 
     from fs.mountfs import MountFS
-    combined_fs = MountFS
+    combined_fs = MountFS()
     combined_fs.mountdir('config', config_fs)
     combined_fs.mountdir('resources', resources_fs)
 

fs/opener.py

@@ -67,6 +67,7 @@ __all__ = ['OpenerError',
            'HTTPOpener']
 
 from fs.path import pathsplit, join, iswildcard, normpath
+from fs.filelike import FileWrapper
 from os import getcwd
 import os.path
 import re
@@ -117,6 +118,14 @@ def _split_url_path(url):
     url = '%s://%s' % (scheme, netloc)
     return url, path
 
+class _FSClosingFile(FileWrapper):
+    """A file like object that closes its parent FS when closed itself"""
+    def close(self):
+        fs = getattr(self, '_closefs', None)
+        ret = super(_FSClosingFile).close()
+        if fs is not None:
+            fs.close
+        return ret
 
 class OpenerRegistry(object):
      
@@ -255,22 +264,8 @@ class OpenerRegistry(object):
         fs, path = self.parse(fs_url, writeable=writeable)                
         file_object = fs.open(path, mode)
                 
-        from fs.filelike import FileWrapper
-        file_object = FileWrapper(file_object, mode)
-        
-        # If we just return the file, then fs goes out of scope and closes,
-        # which may make the file unusable. To get around this, we store a
-        # reference in the file object to the FS, and patch the file's
-        # close method to also close the FS.
-        
-        close = file_object.close
-        close_fs = fs        
-        def replace_close():            
-            ret = close()
-            close_fs.close()
-            return ret                            
-        file_object.close = replace_close
-                    
+        file_object = _FSClosingFile(file_object, mode)
+        file_object.fs = fs
         return file_object        
     
     def getcontents(self, fs_url):