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from __future__ import unicode_literals

import contextlib

import os

import sys

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import Var

from pre_commit.languages import helpers

from pre_commit.languages.python import bin_dir

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.xargs import xargs

ENVIRONMENT_DIR = 'node_env'

get_default_version = helpers.basic_get_default_version

healthy = helpers.basic_healthy

def _envdir(prefix, version):

directory = helpers.environment_dir(ENVIRONMENT_DIR, version)

return prefix.path(directory)

def get_env_patch(venv):

if sys.platform == 'cygwin': # pragma: no cover

_, win_venv, _ = cmd_output('cygpath', '-w', venv)

install_prefix = r'{}\bin'.format(win_venv.strip())

elif sys.platform == 'win32': # pragma: no cover

install_prefix = bin_dir(venv)

else:

install_prefix = venv

return (

('NODE_VIRTUAL_ENV', venv),

('NPM_CONFIG_PREFIX', install_prefix),

('npm_config_prefix', install_prefix),

('NODE_PATH', os.path.join(venv, 'lib', 'node_modules')),

('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),

)

@contextlib.contextmanager

def in_env(prefix, language_version):

with envcontext(get_env_patch(_envdir(prefix, language_version))):

yield

def install_environment(prefix, version, additional_dependencies):

additional_dependencies = tuple(additional_dependencies)

assert prefix.exists('package.json')

envdir = _envdir(prefix, version)

# https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx?f=255&MSPPError=-2147217396#maxpath

if sys.platform == 'win32': # pragma: no cover

envdir = '\\\\?\\' + os.path.normpath(envdir)

with clean_path_on_failure(envdir):

cmd = [

sys.executable, '-mnodeenv', '--prebuilt', '--clean-src', envdir,

]

if version != 'default':

cmd.extend(['-n', version])

cmd_output(*cmd)

with in_env(prefix, version):

helpers.run_setup_cmd(

prefix,

('npm', 'install', '-g', '.') + additional_dependencies,

)

def run_hook(prefix, hook, file_args):

with in_env(prefix, hook['language_version']):

return xargs(helpers.to_cmd(hook), file_args)

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