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