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from __future__ import annotations
import sys
from types import TracebackType
from typing import Literal, Self
import warnings
class prepended_to_syspath:
"""A context for prepending a directory to sys.path for a second."""
dir: str
added: bool
def __init__(self, dir: str) -> None:
self.dir = dir
self.added = False
def __enter__(self) -> Self:
if self.dir not in sys.path:
sys.path.insert(0, self.dir)
self.added = True
else:
self.added = False
return self
def __exit__(
self,
exc_type: type[BaseException] | None,
exc_val: BaseException | None,
exc_tb: TracebackType | None,
) -> Literal[False]:
if self.added:
try:
sys.path.remove(self.dir)
except ValueError:
pass
# Returning False causes any exceptions to be re-raised.
return False
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