Added logic to add CLI commands from external packages

src/cpl_cli/cli.py

@@ -1,6 +1,7 @@
 import sys
 import traceback
 
+from cpl_cli.error import Error
 from cpl_core.application.application_abc import ApplicationABC
 from cpl_core.configuration.configuration_abc import ConfigurationABC
 from cpl_core.console.console import Console
@@ -26,7 +27,16 @@ class CLI(ApplicationABC):
         :return:
         """
         try:
-            self._configuration.parse_console_arguments(self._services)
+            result = self._configuration.parse_console_arguments(self._services)
+            if result:
+                return
+
+            if len(self._configuration.additional_arguments) == 0:
+                Error.error('Expected command')
+                return
+
+            unexpected_arguments = ', '.join(self._configuration.additional_arguments)
+            Error.error(f'Unexpected argument(s): {unexpected_arguments}')
         except KeyboardInterrupt:
             Console.write_line()
             sys.exit()