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""" This module contains classes - NamedFileInTemporaryDirectory, TemporaryWorkingDirectory.
These classes add extra features such as creating a named file in temporary directory and
creating a context manager for the working directory which is also temporary.
"""
import os as _os
from pathlib import Path
from tempfile import TemporaryDirectory
class NamedFileInTemporaryDirectory(object):
def __init__(self, filename, mode="w+b", bufsize=-1, add_to_syspath=False, **kwds):
"""
Open a file named `filename` in a temporary directory.
This context manager is preferred over `NamedTemporaryFile` in
stdlib `tempfile` when one needs to reopen the file.
Arguments `mode` and `bufsize` are passed to `open`.
Rest of the arguments are passed to `TemporaryDirectory`.
"""
self._tmpdir = TemporaryDirectory(**kwds)
path = Path(self._tmpdir.name) / filename
encoding = None if "b" in mode else "utf-8"
self.file = open(path, mode, bufsize, encoding=encoding)
def cleanup(self):
self.file.close()
self._tmpdir.cleanup()
__del__ = cleanup
def __enter__(self):
return self.file
def __exit__(self, type, value, traceback):
self.cleanup()
class TemporaryWorkingDirectory(TemporaryDirectory):
"""
Creates a temporary directory and sets the cwd to that directory.
Automatically reverts to previous cwd upon cleanup.
Usage example:
with TemporaryWorkingDirectory() as tmpdir:
...
"""
def __enter__(self):
self.old_wd = Path.cwd()
_os.chdir(self.name)
return super(TemporaryWorkingDirectory, self).__enter__()
def __exit__(self, exc, value, tb):
_os.chdir(self.old_wd)
return super(TemporaryWorkingDirectory, self).__exit__(exc, value, tb)
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