main: Switch to subcommands

- show-deps replaced with 'mopidy deps'
- show-config replaced with 'mopidy config'
- Just running mopidy now displays help, run 'mopidy run' to start server.

mopidy/__main__.py

@@ -31,9 +31,18 @@ def main():
     signal.signal(signal.SIGUSR1, pykka.debug.log_thread_tracebacks)
 
     parser = commands.build_parser()
+    subparser = parser.add_subparsers(title='commands', metavar='COMMAND')
+
+    run_parser = subparser.add_parser('run', help='start mopidy server')
+    run_parser.set_defaults(command='run')
+    config_parser = subparser.add_parser('config', help='show current config')
+    config_parser.set_defaults(command='config')
+    deps_parser = subparser.add_parser('deps', help='show dependencies')
+    deps_parser.set_defaults(command='deps')
+
     args = parser.parse_args(args=mopidy_args)
 
-    if args.show_deps or args.show_config:
+    if args.command in ('config', 'deps'):
         args.verbosity_level -= 1
 
     bootstrap_logging(args)
@@ -61,13 +70,12 @@ def main():
 
         log_extension_info(installed_extensions, enabled_extensions)
 
-        # TODO: move to 'mopidy config' and 'mopidy deps'
-        if args.show_config:
+        if args.command == 'config':
             logger.info('Dumping sanitized user config and exiting.')
             print config_lib.format(
                 config, installed_extensions, config_errors)
             sys.exit(0)
-        if args.show_deps:
+        elif args.command == 'deps':
             logger.info('Dumping debug info about dependencies and exiting.')
             print deps.format_dependency_list()
             sys.exit(0)

mopidy/commands.py

@@ -37,14 +37,6 @@ def build_parser():
         '--save-debug-log',
         action='store_true', dest='save_debug_log',
         help='save debug log to "./mopidy.log"')
-    parser.add_argument(
-        '--show-config',
-        action='store_true', dest='show_config',
-        help='show current config')
-    parser.add_argument(
-        '--show-deps',
-        action='store_true', dest='show_deps',
-        help='show dependencies and their versions')
     parser.add_argument(
         '--config',
         action='store', dest='config_files', type=config_files_type,

tests/help_test.py

@@ -22,6 +22,5 @@ class HelpTest(unittest.TestCase):
         self.assertIn('--quiet', output)
         self.assertIn('--verbose', output)
         self.assertIn('--save-debug-log', output)
-        self.assertIn('--show-config', output)
         self.assertIn('--config', output)
         self.assertIn('--option', output)