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/CmdSelect.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+
+from argparse import Namespace, ArgumentParser
+import re
+
+from ..CmdDistro import CmdDistro
+from .lib.Package import Package
+from .Cmd import Cmd
+from .backend.BeSelect import BeSelect
+
+class CmdSelect(Cmd): # export
+
+    def __init__(self, parent: CmdDistro) -> None:
+        super().__init__(parent, 'select', help="Select packages by filter")
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+        parser.add_argument("filter", help="Package filter string")
+
+    def filter_packages(self, filter: str, packages: list[Package]) -> list[Package]:
+        # -- Poor man's parsing for now
+        url_rx_str = re.sub(r'^\s*url\s*=~\s*', '', filter)
+        if url_rx_str == filter:
+            raise Exception(f'Unsupported filter string "{filter}"')
+        url_rx = re.compile(url_rx_str)
+        return [p for p in packages if re.search(url_rx, p.url) is not None]
+
+    async def _run(self, args: Namespace) -> None:
+        # TODO: Semantics probably change heavily in the future
+        for p in self.filter_packages(args.filter, await self._backend.all_installed_packages):
+            print(p.name)

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()