shithub: aubio

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python/lib/aubio/cmd.py: add help subcommand

--- a/python/lib/aubio/cmd.py

+++ b/python/lib/aubio/cmd.py

@@ -22,6 +22,8 @@

     subparsers = parser.add_subparsers(title='commands', dest='command',

             metavar="")

+    parser_add_subcommand_help(subparsers)

+

     parser_add_subcommand_onset(subparsers)

     parser_add_subcommand_pitch(subparsers)

     parser_add_subcommand_beat(subparsers)

@@ -33,6 +35,12 @@

     return parser

+def parser_add_subcommand_help(subparsers):

+    # global help subcommand

+    subparsers.add_parser('help',

+            help='show help message',

+            formatter_class = argparse.ArgumentDefaultsHelpFormatter)

+

 def parser_add_subcommand_onset(subparsers):

     # onset subcommand

     subparser = subparsers.add_parser('onset',

@@ -436,10 +444,13 @@

         sys.exit(0)

     elif 'verbose' in args and args.verbose > 3:

         sys.stderr.write('aubio version ' + aubio.version + '\n')

-    if 'command' not in args or args.command is None:

+    if 'command' not in args or args.command is None or args.command in ['help']:

         # no command given, print help and return 1

         parser.print_help()

-        sys.exit(1)

+        if args.command and args.command in ['help']:

+            sys.exit(0)

+        else:

+            sys.exit(1)

     elif not args.source_uri and not args.source_uri2:

         sys.stderr.write("Error: a source is required\n")

         parser.print_help()