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from __future__ import unicode_literals

import contextlib

import errno

import functools

import os

import os.path

import shutil

import stat

import subprocess

import tarfile

import tempfile

import pkg_resources

from pre_commit import five

@contextlib.contextmanager

def cwd(path):

original_cwd = os.getcwd()

os.chdir(path)

try:

yield

finally:

os.chdir(original_cwd)

def memoize_by_cwd(func):

"""Memoize a function call based on os.getcwd()."""

@functools.wraps(func)

def wrapper(*args):

cwd = os.getcwd()

key = (cwd,) + args

try:

return wrapper._cache[key]

except KeyError:

ret = wrapper._cache[key] = func(*args)

return ret

wrapper._cache = {}

return wrapper

@contextlib.contextmanager

def clean_path_on_failure(path):

"""Cleans up the directory on an exceptional failure."""

try:

yield

except BaseException:

if os.path.exists(path):

rmtree(path)

raise

@contextlib.contextmanager

def noop_context():

yield

def shell_escape(arg):

return "'" + arg.replace("'", "'\"'\"'".strip()) + "'"

@contextlib.contextmanager

def tarfile_open(*args, **kwargs):

"""Compatibility layer because python2.6"""

tf = tarfile.open(*args, **kwargs)

try:

yield tf

finally:

tf.close()

@contextlib.contextmanager

def tmpdir():

"""Contextmanager to create a temporary directory. It will be cleaned up

afterwards.

"""

tempdir = tempfile.mkdtemp()

try:

yield tempdir

finally:

rmtree(tempdir)

def resource_filename(filename):

return pkg_resources.resource_filename(

'pre_commit',

os.path.join('resources', filename),

)

class CalledProcessError(RuntimeError):

def __init__(self, returncode, cmd, expected_returncode, output=None):

super(CalledProcessError, self).__init__(

returncode, cmd, expected_returncode, output,

)

self.returncode = returncode

self.cmd = cmd

self.expected_returncode = expected_returncode

self.output = output

def __str__(self):

output = []

for text in self.output:

if text:

output.append('\n ' + text.replace('\n', '\n '))

else:

output.append('(none)')

return (

'Command: {0!r}\n'

'Return code: {1}\n'

'Expected return code: {2}\n'

'Output: {3}\n'

'Errors: {4}\n'.format(

self.cmd,

self.returncode,

self.expected_returncode,

*output

)

def cmd_output(*cmd, **kwargs):

retcode = kwargs.pop('retcode', 0)

stdin = kwargs.pop('stdin', None)

encoding = kwargs.pop('encoding', 'UTF-8')

__popen = kwargs.pop('__popen', subprocess.Popen)

popen_kwargs = {

'stdin': subprocess.PIPE,

'stdout': subprocess.PIPE,

'stderr': subprocess.PIPE,

}

if stdin is not None:

stdin = stdin.encode('UTF-8')

# py2/py3 on windows are more strict about the types here

cmd = [five.n(arg) for arg in cmd]

kwargs['env'] = dict(

(five.n(key), five.n(value))

for key, value in kwargs.pop('env', {}).items()

) or None

popen_kwargs.update(kwargs)

proc = __popen(cmd, **popen_kwargs)

stdout, stderr = proc.communicate(stdin)

if encoding is not None and stdout is not None:

stdout = stdout.decode(encoding)

if encoding is not None and stderr is not None:

stderr = stderr.decode(encoding)

returncode = proc.returncode

if retcode is not None and retcode != returncode:

raise CalledProcessError(

returncode, cmd, retcode, output=(stdout, stderr),

)

return proc.returncode, stdout, stderr

def rmtree(path):

"""On windows, rmtree fails for readonly dirs."""

def handle_remove_readonly(func, path, exc): # pragma: no cover (windows)

excvalue = exc[1]

if func in (os.rmdir, os.remove) and excvalue.errno == errno.EACCES:

os.chmod(path, stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)

func(path)

else:

raise

shutil.rmtree(path, ignore_errors=False, onerror=handle_remove_readonly)

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