#!/usr/bin/python3
#
# Copyright (c) 2012 Mikkel Schubert <MikkelSch@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
import os

from pathlib import Path
from typing import Union

from .fileutils import fspath


class SetWorkingDirectory:
    """Sets the current working directory upon entry to that specified,
    in the constructor upon entry, and reverts to the previously used
    directory upon exiting a with statement."""

    def __init__(self, path: Union[str, Path]):
        self._old_cwd = None
        self._new_cwd = fspath(path)

    def __enter__(self):
        self._old_cwd = os.getcwd()
        os.chdir(self._new_cwd)

    def __exit__(self, _type, _value, _traceback):
        os.chdir(self._old_cwd)
