lib.base: Add module

Add lib.base to provide basic definitions.

For now, move the definiions of Result, Input and InputMode from
ExecContext into lib.base. Having to import them from the ExecContect
module is too heavy-handed for those simple types.

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

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

@@ -4,34 +4,14 @@ from __future__ import annotations
 
 import abc, re, sys
 from enum import Enum, auto
-from typing import NamedTuple, TypeAlias, TYPE_CHECKING
+from typing import NamedTuple, TYPE_CHECKING
 
 if TYPE_CHECKING:
     from typing import Self, Type
     from types import TracebackType
 
 from .log import *
-
-class InputMode(Enum):
-    Interactive = auto()
-    NonInteractive = auto()
-    OptInteractive = auto()
-    Auto = auto()
-
-Input: TypeAlias = InputMode | bytes | str
-
-class Result(NamedTuple):
-
-    stdout: str|None
-    stderr: str|None
-    status: int|None
-
-    def decode(self, encoding='UTF-8', errors='replace') -> Result:
-        return Result(
-            self.stdout.decode(encoding, errors=errors) if self.stdout is not None else None,
-            self.stderr.decode(encoding, errors=errors) if self.stderr is not None else None,
-            self.status
-        )
+from .base import Input, InputMode, Result
 
 class ExecContext(abc.ABC):