From 1e949caad0c17f862d4a045800915824500e7e43 Mon Sep 17 00:00:00 2001
From: Mac Mollison <mollison@cs.unc.edu>
Date: Sat, 13 Mar 2010 17:28:27 -0500
Subject: Add --help output for scripts and detect no args

---
 scripts/visualize.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'scripts/visualize.py')

diff --git a/scripts/visualize.py b/scripts/visualize.py
index 5685d1a..2899b43 100755
--- a/scripts/visualize.py
+++ b/scripts/visualize.py
@@ -26,9 +26,13 @@ from unit_trace import visualizer
 
 # Get trace files from command line arguments
 from optparse import OptionParser
-parser = OptionParser()
+usage = "usage: %prog <one or more trace files>"
+parser = OptionParser(usage=usage)
 (options, traces) = parser.parse_args()
 traces = list(traces)
+if len(traces) < 1:
+    parser.print_help()
+    exit()
 
 ################################################################################
 # Pipeline
-- 
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