use "with" to handle files

stanza

@@ -36,10 +36,7 @@ def debug(line):
 debug(pformat(args))
 
 # Set up the file handle, <file> or stdin
-if cmd.filename:
+with open(cmd.filename,'r') if cmd.filename else sys.stdin as handle:
-    handle=open(cmd.filename)
-else:
-    handle=sys.stdin
 	# Go over the handle, line by line
 	for line in handle:
 	    # Start buffering if we hit the start regex