# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 1398458131 25200
# Node ID f0f8100968429a31948eb74f53b8dd22b7c7e820
# Parent  7078ce067367f1eed24a269a327f34d5defd528b
revsetbenchmark: add a usage message when no arguments are passed

This increase the odd someone who didn't wrote will it find out how to use this
script.

diff -r 7078ce067367 -r f0f810096842 contrib/revsetbenchmarks.py
--- a/contrib/revsetbenchmarks.py	Tue Apr 29 19:15:36 2014 -0700
+++ b/contrib/revsetbenchmarks.py	Fri Apr 25 13:35:31 2014 -0700
@@ -66,6 +66,10 @@
 
 
 
+if len(sys.argv) < 2:
+    print >> sys.stderr, 'usage: %s <revs> [file]' % sys.argv[0]
+    sys.exit(255)
+
 target_rev = sys.argv[1]
 
 revsetsfile = sys.stdin