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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.util import clean_path_on_failure

from pre_commit.xargs import xargs

ENVIRONMENT_DIR = 'node_env'

def get_env_patch(venv): # pragma: windows no cover

return (

('NODE_VIRTUAL_ENV', venv),

('NPM_CONFIG_PREFIX', venv),

('npm_config_prefix', venv),

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

('PATH', (os.path.join(venv, 'bin'), os.pathsep, Var('PATH'))),

)

@contextlib.contextmanager

def in_env(repo_cmd_runner, language_version): # pragma: windows no cover

envdir = repo_cmd_runner.path(

helpers.environment_dir(ENVIRONMENT_DIR, language_version),

)

with envcontext(get_env_patch(envdir)):

yield

def install_environment(

repo_cmd_runner,

version='default',

additional_dependencies=(),

): # pragma: windows no cover

additional_dependencies = tuple(additional_dependencies)

assert repo_cmd_runner.exists('package.json')

directory = helpers.environment_dir(ENVIRONMENT_DIR, version)

env_dir = repo_cmd_runner.path(directory)

with clean_path_on_failure(env_dir):

cmd = [

sys.executable, '-m', 'nodeenv', '--prebuilt',

'{{prefix}}{}'.format(directory),

]

if version != 'default':

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

repo_cmd_runner.run(cmd)

with in_env(repo_cmd_runner, version):

helpers.run_setup_cmd(

repo_cmd_runner,

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

)

def run_hook(repo_cmd_runner, hook, file_args): # pragma: windows no cover

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

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

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