From 6b7b9ed47ccda8ebc7266d766448bab6afabccae Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Sun, 3 Feb 2013 19:21:10 +0200
Subject: [PATCH] Better command line help.

---
 builder.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builder.py b/builder.py
index 0d6b7e5cc..d25e72863 100755
--- a/builder.py
+++ b/builder.py
@@ -79,7 +79,8 @@ class BuilderApp():
 if __name__ == '__main__':
     (options, args) = parser.parse_args(sys.argv)
     if len(args) == 1 or len(args) > 3:
-        print('Invalid number of arguments')
+        print('%s <source directory> <build directory>' % sys.argv[0])
+        print('If you omit either directory, the current directory is substituted.')
         sys.exit(1)
     dir1 = args[1]
     if len(args) > 2: