Support single device manager name in CLI

Author: tpoliaw

src/dodal/cli.py

@@ -45,8 +45,8 @@ def main(ctx: click.Context) -> None:
     "attempt any I/O. Useful as a a dry-run.",
     default=False,
 )
-@click.option("-n", "--name", multiple=True)
-def connect(beamline: str, all: bool, sim_backend: bool, name: tuple[str, ...]) -> None:
+@click.option("-n", "--name")
+def connect(beamline: str, all: bool, sim_backend: bool, name: str | None) -> None:
     """Initialises a beamline module, connects to all devices, reports
     any connection issues."""
 
@@ -71,15 +71,16 @@ def connect(beamline: str, all: bool, sim_backend: bool, name: tuple[str, ...])
     # be lazy.
 
     if name:
-        for manager_name in name:
-            if (manager := getattr(mod, manager_name, None)) and isinstance(
-                manager, DeviceManager
-            ):
-                devices, instance_exceptions, connect_exceptions = (
-                    manager.build_and_connect(
-                        mock=sim_backend,
-                    )
+        if (manager := getattr(mod, name, None)) and isinstance(manager, DeviceManager):
+            devices, instance_exceptions, connect_exceptions = (
+                manager.build_and_connect(
+                    mock=sim_backend,
                 )
+            )
+        else:
+            raise ValueError(
+                f"Name '{name}' could not be found or is not a DeviceManager"
+            )
     else:
         _spoof_path_provider()
         devices, instance_exceptions = make_all_devices(