Added help message to all cli commands

src/cpl_cli/command/help_service.py

@@ -1,22 +1,49 @@
+import textwrap
+from typing import Optional
+
 from cpl.console.console import Console
 from cpl.console.foreground_color_enum import ForegroundColorEnum
+from cpl.dependency_injection.service_provider_abc import ServiceProviderABC
+from cpl_cli.command_handler_service import CommandHandler
 from cpl_cli.command_abc import CommandABC
 
 
 class HelpService(CommandABC):
 
-    def __init__(self):
+    def __init__(self, services: ServiceProviderABC, cmd_handler: CommandHandler):
         """
         Service for CLI command help
         """
         CommandABC.__init__(self)
 
+        self._services = services
+        self._commands = cmd_handler.commands
+
+    @property
+    def help_message(self) -> str:
+        return textwrap.dedent("""\
+        """)
+
     def run(self, args: list[str]):
         """
         Entry point of command
         :param args:
         :return:
         """
+        if len(args) > 0:
+            command_name = args[0]
+            command: Optional[CommandABC] = None
+            for cmd in self._commands:
+                if cmd.name == command_name:
+                    command = self._services.get_service(cmd.command)
+
+            if command is None:
+                Console.error(f'Invalid argument: {command_name}')
+
+            Console.write_line(command.help_message)
+
+            return
+
         Console.write_line('Available Commands:')
         commands = [
             ['add (a|a)', 'Adds a project reference to given project.'],