jw.pkg.cmds.distro: Add directory

Add the subdirectory structure for the distro subcommand.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/distro/Cmd.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+
+import os, importlib
+
+from ..Cmd import Cmd as Base
+from ..CmdDistro import CmdDistro
+
+class Cmd(Base): # export
+
+    def __init__(self, parent: CmdDistro, name: str, help: str) -> None:
+        super().__init__(parent, name, help)
+        self.__backend = None
+
+    @property
+    def distro_id(self) -> str:
+        return self.parent.distro_id
+
+    @property
+    def interactive(self) -> bool:
+        return self.parent.interactive
+
+    @property
+    def _backend(self):
+        if self.__backend is None:
+            class_name = self.__class__.__name__[3:] # Get rid of "Cmd"
+            backend_id = self.parent.distro_id.lower().replace('-', '_')
+            match backend_id:
+                case 'ubuntu' | 'raspbian':
+                    backend_id = 'debian'
+                case 'centos':
+                    backend_id = 'redhat'
+                case 'opensuse_tumbleweed':
+                    backend_id = 'suse'
+            module_name = (
+                os.path.splitext(__name__)[0]
+                + '.backend.'
+                + backend_id
+                + '.'
+                + class_name
+            )
+            module = importlib.import_module(module_name)
+            cls = getattr(module, class_name)
+            self.__backend = cls(self)
+        return self.__backend