Fixed flags for optional arguments.

generate.py

@@ -73,9 +73,9 @@ def main():
 
     parser = argparse.ArgumentParser(description='Generate experiment data.')
     parser.add_argument('description', type=str, nargs='+', help='file containing the taskset description.')
-    parser.add_argument('header', type=str, nargs='?', default='./template/config.h', help='path to optional custom header file.')
-    parser.add_argument('makefile', type=str, nargs='?', default='./template/Makefile', help='path to optional custom makefile.')
-    parser.add_argument('cpp', type=str, nargs='?', default='./template/experiment.cpp', help='path to optional custom c++ implementation.')
+    parser.add_argument('--header', type=str, nargs='?', default='./template/config.h', help='path to optional custom header file.')
+    parser.add_argument('--makefile', type=str, nargs='?', default='./template/Makefile', help='path to optional custom makefile.')
+    parser.add_argument('--cpp', type=str, nargs='?', default='./template/experiment.cpp', help='path to optional custom c++ implementation.')
 
     args = parser.parse_args()
     cwd = os.getcwd()