Command line sugar

src/phicli

@@ -2,6 +2,7 @@
 from pprint import pformat as pp
 import sys
 import argparse
+import inspect
 
 import phi.ldap.client
 from phi.config import get_config
@@ -11,21 +12,55 @@ from phi.ldap.user import get_user_by_uid
 
 log = get_logger(__name__)
 
+parser = argparse.ArgumentParser()
+parser.add_argument(
+    '--config', metavar='config.yml', help='custom configuration file')
+subparses = parser.add_subparsers(title='actions', dest='action')
+
+cli_callbacks = {}
+
+
+def cli_register(action_info='', param_infos=[]):
+    def decorator(action):
+        # Get function name and arguments
+        action_name = action.__name__
+        param_names = inspect.getfullargspec(action)[0]
+
+        # Create subparser for specific action
+        subparser = subparses.add_parser(action_name, help=action_info)
+
+        for name, info in zip(param_names, param_infos):
+            subparser.add_argument(dest=name, help=info)
+
+        # Register action
+        cli_callbacks[action_name] = action, param_names
+        return action
+
+    return decorator
+
+
+def cli_run(args):
+    for action_name, (action, param_names) in cli_callbacks.items():
+        if args['action'] == action_name:
+            action(**{pname: args[pname] for pname in param_names})
+
+
+def cli_get_args():
+    namespace = parser.parse_args(sys.argv[1:])
+    args = namespace.__dict__
+    return args
+
+
+@cli_register('dispaly user field', ['user identifier'])
+def showuser(uid):
+    user = get_user_by_uid(client, uid)
+    print('\nuid: {}\n{}\n\n'.format(uid, pp(user)))
+
 
 if __name__ == '__main__':
-    parser = argparse.ArgumentParser()
+    args = cli_get_args()
 
-    parser.add_argument(
+    config_file = args['config']
-        '--config', metavar='config.yml', help='custom configuration file')
-
-    subparses = parser.add_subparsers(title='actions', dest='action')
-
-    parser_showuser = subparses.add_parser(
-        'showuser', help='display user fields')
-    parser_showuser.add_argument(dest='uid', help='user identifier')
-
-    namespace = parser.parse_args(sys.argv[1:])
-    config_file = namespace.config
 
     config_file, config = get_config(config_file)
     setup_logging(config.get('logging', {}))
@@ -38,12 +73,9 @@ if __name__ == '__main__':
     log.info('Opening LDAP client')
     client.open()
 
-    log.info('Arguments: {}'.format(pp(namespace.__dict__)))
+    log.info('Arguments: {}'.format(pp(args)))
 
-    if namespace.action == 'showuser':
+    cli_run(args)
-        uid = namespace.uid
-        user = get_user_by_uid(client, uid)
-        print('\nuid: {}\n{}\n\n'.format(uid, pp(user)))
 
     log.info('Closing LDAP client')
     client.close()