diff -r 165b5d65e1cb -r 8680c2333546 demo.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demo.py	Mon Feb 16 21:17:43 2015 +0100
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+from demos.base import setup
+import sys
+import os
+import re
+
+
+def list_demos():
+    return sorted(fname for fname in os.listdir('demos')
+                  if re.match(r'[0-9]+_.*\.py', fname))
+
+
+def print_usage(names):
+    print("Usage: %s <name>\n" % sys.argv[0])
+    print("Where <name> is one of (or part of):")
+    print('\n'.join(['    '+name for name in names]))
+
+
+if __name__ == '__main__':
+    setup()
+    names = list_demos()
+
+    if len(sys.argv) != 2:
+        print_usage(names)
+        sys.exit(0)
+
+    arg = sys.argv[1]
+    name = None
+    for name in names:
+        if arg in name:
+            break
+    else:
+        print("Demo '%s' not found." % arg)
+        sys.exit(1)
+
+    print("Executing %s..." % name)
+    with open('demos/' + name, 'r') as f:
+        exec(f.read())