fsobject.directory: little optimization in sorting

1. no need to call path.basename.lower() since it's cached in
path.basename_lower.

2. no need to convert a bool to int for arithmetic operations

3. path.is_directory is faster than an isinstance() check

1 files changed, 2 insertions, 2 deletions

diff --git a/ranger/fsobject/directory.py b/ranger/fsobject/directory.py
index 3ef897e0..b0a93893 100644
--- a/ranger/fsobject/directory.py
+++ b/ranger/fsobject/directory.py
@@ -29,11 +29,11 @@ def sort_by_basename(path):
 
 def sort_by_basename_icase(path):
 	"""returns case-insensitive path.basename (for sorting)"""
-	return path.basename.lower()
+	return path.basename_lower
 
 def sort_by_directory(path):
 	"""returns 0 if path is a directory, otherwise 1 (for sorting)"""
-	return 1 - int( isinstance( path, Directory ) )
+	return 1 - path.is_directory
 
 class NoDirectoryGiven(Exception):
 	pass