Enable listing of devices without list-devices subcommand

Author: maresb

src/labelle/cli/cli.py

@@ -88,10 +88,6 @@ def get_device_manager() -> DeviceManager:
     return device_manager
 
 
-app = typer.Typer()
-
-
-@app.command(hidden=True)
 def list_devices() -> NoReturn:
     device_manager = get_device_manager()
     console = Console()
@@ -105,6 +101,9 @@ def list_devices() -> NoReturn:
     raise typer.Exit()
 
 
+app = typer.Typer()
+
+
 @app.callback(invoke_without_command=True)
 def default(
     ctx: typer.Context,
@@ -123,7 +122,8 @@ def default(
             "--device",
             help=(
                 "Select a particular device by filtering for a given substring "
-                "in the device's manufacturer, product or serial number"
+                "in the device's manufacturer, product or serial number. "
+                'Use "--device list" to list all available devices.'
             ),
             rich_help_panel="Device Configuration",
         ),
@@ -378,6 +378,9 @@ def default(
         # Neither --verbose flag nor the environment variable is set.
         set_not_verbose()
 
+    if device_pattern == ["list"]:
+        list_devices()
+
     # Raise informative errors with old dymoprint arguments
     if preview:
         raise typer.BadParameter(