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# emacs: -*- mode: python-mode; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
#
#   See COPYING file distributed along with the NiBabel package for the
#   copyright and license terms.
#
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
''' Contexts for *with* statement providing temporary directories
'''
from __future__ import with_statement
import os
import shutil
from tempfile import template, mkdtemp


class TemporaryDirectory(object):
    """Create and return a temporary directory.  This has the same
    behavior as mkdtemp but can be used as a context manager.

    Upon exiting the context, the directory and everthing contained
    in it are removed.

    Examples
    --------
    >>> import os
    >>> with TemporaryDirectory() as tmpdir:
    ...     fname = os.path.join(tmpdir, 'example_file.txt')
    ...     with open(fname, 'wt') as fobj:
    ...         _ = fobj.write('a string\\n')
    >>> os.path.exists(tmpdir)
    False
    """
    def __init__(self, suffix="", prefix=template, dir=None, chdir=False):
        self.name = mkdtemp(suffix, prefix, dir)
        self._closed = False

    def __enter__(self):
        return self.name

    def cleanup(self):
        if not self._closed:
            shutil.rmtree(self.name)
            self._closed = True

    def __exit__(self, exc, value, tb):
        self.cleanup()
        return False


class InTemporaryDirectory(TemporaryDirectory):
    ''' Create, return, and change directory to a temporary directory

    Examples
    --------
    >>> import os
    >>> my_cwd = os.getcwd()
    >>> with InTemporaryDirectory() as tmpdir:
    ...     _ = open('test.txt', 'wt').write('some text')
    ...     assert os.path.isfile('test.txt')
    ...     assert os.path.isfile(os.path.join(tmpdir, 'test.txt'))
    >>> os.path.exists(tmpdir)
    False
    >>> os.getcwd() == my_cwd
    True
    '''
    def __enter__(self):
        self._pwd = os.getcwd()
        os.chdir(self.name)
        return super(InTemporaryDirectory, self).__enter__()

    def __exit__(self, exc, value, tb):
        os.chdir(self._pwd)
        return super(InTemporaryDirectory, self).__exit__(exc, value, tb)