add machine subcommand

pkgs/clan-cli/clan_cli/machines/list.py

@@ -0,0 +1,25 @@
+import argparse
+import os
+
+from .folders import machines_folder
+from .types import validate_hostname
+
+
+def list_machines() -> list[str]:
+    path = machines_folder()
+    if not path.exists():
+        return []
+    objs: list[str] = []
+    for f in os.listdir(path):
+        if validate_hostname(f):
+            objs.append(f)
+    return objs
+
+
+def list_command(args: argparse.Namespace) -> None:
+    for machine in list_machines():
+        print(machine)
+
+
+def register_list_parser(parser: argparse.ArgumentParser) -> None:
+    parser.set_defaults(func=list_command)