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"""TemporaryDirectory class, copied from Python 3.2.

This is copied from the stdlib and will be standard in Python 3.2 and onwards.

"""

from __future__ import print_function

import os as _os

import warnings as _warnings

import sys as _sys

# This code should only be used in Python versions < 3.2, since after that we

# can rely on the stdlib itself.

try:

from tempfile import TemporaryDirectory

except ImportError:

from tempfile import mkdtemp, template

class TemporaryDirectory(object):

"""Create and return a temporary directory. This has the same

behavior as mkdtemp but can be used as a context manager. For

example:

with TemporaryDirectory() as tmpdir:

...

Upon exiting the context, the directory and everthing contained

in it are removed.

"""

def __init__(self, suffix="", prefix=template, dir=None):

self.name = mkdtemp(suffix, prefix, dir)

self._closed = False

def __enter__(self):

return self.name

def cleanup(self, _warn=False):

if self.name and not self._closed:

try:

self._rmtree(self.name)

except (TypeError, AttributeError) as ex:

# Issue #10188: Emit a warning on stderr

# if the directory could not be cleaned

# up due to missing globals

if "None" not in str(ex):

raise

print("ERROR: {!r} while cleaning up {!r}".format(ex, self,),

file=_sys.stderr)

return

self._closed = True

if _warn:

self._warn("Implicitly cleaning up {!r}".format(self),

Warning)

def __exit__(self, exc, value, tb):

self.cleanup()

def __del__(self):

# Issue a ResourceWarning if implicit cleanup needed

self.cleanup(_warn=True)

# XXX (ncoghlan): The following code attempts to make

# this class tolerant of the module nulling out process

# that happens during CPython interpreter shutdown

# Alas, it doesn't actually manage it. See issue #10188

_listdir = staticmethod(_os.listdir)

_path_join = staticmethod(_os.path.join)

_isdir = staticmethod(_os.path.isdir)

_remove = staticmethod(_os.remove)

_rmdir = staticmethod(_os.rmdir)

_os_error = _os.error

_warn = _warnings.warn

def _rmtree(self, path):

# Essentially a stripped down version of shutil.rmtree. We can't

# use globals because they may be None'ed out at shutdown.

for name in self._listdir(path):

fullname = self._path_join(path, name)

try:

isdir = self._isdir(fullname)

except self._os_error:

isdir = False

if isdir:

self._rmtree(fullname)

else:

try:

self._remove(fullname)

except self._os_error:

pass

try:

self._rmdir(path)

except self._os_error:

pass

class NamedFileInTemporaryDirectory(object):

def __init__(self, filename, mode='w+b', bufsize=-1, **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 = _os.path.join(self._tmpdir.name, filename)

self.file = open(path, mode, bufsize)

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 = _os.getcwd()

_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)