Fixed libbe.command.diff + ugly BugDir.duplicate_bugdir implementation

duplicate_bugdir() works, but for the vcs backends, it could require
shelling out for _every_ file read.  This could, and probably will, be
horribly slow.  Still it works ;).

I'm not sure what a better implementation would be.  The old
implementation checked out the entire earlier state into a temporary
directory
  pros: single shell out, simple upgrade implementation
  cons: wouldn't work well for HTTP backens

I think a good solution would run along the lines of the currently
commented out code in duplicate_bugdir(), where a
  VersionedStorage.changed_since(revision)
call would give you a list of changed files.  diff could work off of
that directly, without the need to generate a whole duplicate bugdir.
I'm stuck on how to handle upgrades though...

Also removed trailing whitespace from all python files.

1 files changed, 2 insertions, 2 deletions

diff --git a/libbe/command/base.py b/libbe/command/base.py
index 9f50632..6a49413 100644
--- a/libbe/command/base.py
+++ b/libbe/command/base.py
@@ -263,7 +263,7 @@ class Command (object):
         self.stdout = codecs.getwriter(output_encoding)(sys.stdout)
         self.stdout.encoding = output_encoding
 
-    def help(self, *args):       
+    def help(self, *args):
         return '\n\n'.join([self._usage(),
                             self._option_help(),
                             self._long_help().rstrip('\n')])
@@ -345,7 +345,7 @@ class Command (object):
     def _get_storage(self):
         """
         Callback for use by commands that need it.
-        
+
         Note that with the current implementation,
         _get_unconnected_storage() will not work after this method
         runs, but that shouldn't be an issue for any command I can