Minor changes

esds/__main__.py

@@ -2,31 +2,29 @@ import sys, argparse, os
 from .platform import YAMLPlatformFile
 from esds import __version__
 
-def run(arguments):
-    parser = argparse.ArgumentParser(description='Run a simulation')
-    parser.add_argument("platform", help="Run a simulation using a specific platform file")
-    args = parser.parse_args(arguments[1:])
-    if args.platform:
-        simulation=YAMLPlatformFile(args.platform)
-        # Allow importlib (in simulator.run()) to import file from the platform.yaml directory
-        sys.path.insert(0, simulation.location)
-        simulation.run()
-    else:
-        parser.print_help()
+def run(platform):
+    simulation=YAMLPlatformFile(platform)
+    # Allow importlib (in simulator.run()) to import file from the platform.yaml directory
+    sys.path.insert(0, simulation.location)
+    simulation.run()
 
 def main():
-    ##### Parse arguments
+    ##### Main parser
     parser = argparse.ArgumentParser(
         description='ESDS simulator command line interface. Run simulations and perform various simulation tasks.',
         formatter_class=argparse.RawTextHelpFormatter)
-    parser.add_argument("command", help="Execute the specified command.\nAvailable commands are: run", nargs=argparse.REMAINDER)
     parser.add_argument("--version", help="Show esds version", action="store_true")
-    args = parser.parse_args()
+    subparsers = parser.add_subparsers(dest="command", help='Execute the specified command')
 
-    ##### Run commands
+    ##### Run subparser
+    run_parser=subparsers.add_parser("run", description='Run a simulation')
+    run_parser=run_parser.add_argument("platform", help="Platform file")
+
+    ##### Execute commands
+    args = parser.parse_args()
     if args.command:
-        if args.command[0] == "run":
-            run(args.command)
+        if args.command == "run":
+            run(args.platform)
     elif args.version:
         print("ESDS v"+__version__)
     else: