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import enum
from contextlib import contextmanager
from dataclasses import dataclass
from pathlib import Path, PurePath
from typing import IO, Callable, Generator, Optional, TextIO, Union
DestParmType = Union[Path, PurePath, str, IO[bytes], TextIO]
@dataclass(frozen=True)
class DestRef:
param: DestParmType
path: Path
class DestinationType(str, enum.Enum):
RETURN = enum.auto()
PATH = enum.auto()
PURE_PATH = enum.auto()
STR_PATH = enum.auto()
FILE_URI = enum.auto()
BINARY_IO = enum.auto()
TEXT_IO = enum.auto()
@contextmanager
def make_ref(
self,
tmp_path: Path,
encoding: Optional[str] = None,
path_factory: Callable[[Path, "DestinationType", Optional[str]], Path] = (
lambda tmp_path, type, encoding: tmp_path / f"file-{type.name}-{encoding}"
),
) -> Generator[Optional[DestRef], None, None]:
path = path_factory(tmp_path, self, encoding)
# path = tmp_path / f"file-{self.name}"
if self is DestinationType.RETURN:
yield None
elif self is DestinationType.PATH:
yield DestRef(path, path)
elif self is DestinationType.PURE_PATH:
yield DestRef(PurePath(path), path)
elif self is DestinationType.STR_PATH:
yield DestRef(f"{path}", path)
elif self is DestinationType.FILE_URI:
yield DestRef(path.as_uri(), path)
elif self is DestinationType.BINARY_IO:
with path.open("wb") as bfh:
yield DestRef(bfh, path)
elif self is DestinationType.TEXT_IO:
assert encoding is not None
with path.open("w", encoding=encoding) as fh:
yield DestRef(fh, path)
else:
raise ValueError(f"unsupported type {type!r}")
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