jw.pkg.cmds.distro.CmdSelect: Add command

Add the sub-command select to jw-pkg.py distro, along with an
Implementation for OpenSUSE.

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

src/python/jw/pkg/cmds/distro/backend/BeSelect.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+import abc
+from typing import Iterable
+
+from .Backend import Backend as Base
+
+if TYPE_CHECKING:
+    from ..CmdSelect import CmdSelect as Parent
+    from .Package import Package
+
+class BeSelect(Base):
+
+    def __init__(self, parent: Parent):
+        super().__init__(parent)
+
+    @property
+    async def all_installed_packages(self) -> Iterable[Package]:
+        return await self._all_installed_packages()
+
+    @abc.abstractmethod
+    async def _all_installed_packages(self) -> Iterable[Package]:
+        pass

src/python/jw/pkg/cmds/distro/backend/suse/Select.py

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+
+from typing import Iterable
+from argparse import Namespace
+
+from ...lib.Package import Package
+from ...lib.rpm import all_installed_packages
+from ...Cmd import Cmd
+from ..BeSelect import BeSelect as Base
+
+class Select(Base):
+
+    def __init__(self, parent: Cmd):
+        super().__init__(parent)
+
+    async def _all_installed_packages(self) -> Iterable[Package]:
+        return await all_installed_packages()