lib.Distro.select(): Add filter parameter

Add an optional "filter: PackageFilter|None" parameter to .select(),
and if it's not None, call a new version of ._select() with it.

._select() is not abstract anylonger. Its default implementation
filters the results of ._select_by_name(), can be reimplemented by
deriving classes for better performance, but doesn't have to.

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

src/python/jw/pkg/lib/Distro.py

@@ -11,6 +11,7 @@ if TYPE_CHECKING:
 
 import abc, importlib, re
 
+from .PackageFilter import PackageFilter
 from .ExecContext import ExecContext
 from .base import Result, InputMode
 from .Package import Package
@@ -326,8 +327,16 @@ class Distro(abc.ABC):
     async def _select_by_name(self, names: Iterable[str]) -> Iterable[Package]:
         pass
 
-    async def select(self, names: Iterable[str] = []) -> Iterable[Package]:
+    async def _select(self, names: Iterable[str], filter: PackageFilter) -> Iterable[Package]:
-        return await self._select_by_name(names)
+        assert filter, "No filter in _select()"
+        return [p for p in await self._select_by_name(names) if filter.match(p)]
+
+    async def select(self, names: Iterable[str] = [], filter: PackageFilter|None=None) -> Iterable[Package]:
+        if not filter:
+            filter = self.__default_pkg_filter
+        if not filter:
+            return await self._select_by_name(names)
+        return await self._select(names, filter)
 
     # -- install