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import contextlib

import functools

import os

import sys

from typing import Generator

from typing import Sequence

from typing import Tuple

import pre_commit.constants as C

from pre_commit import parse_shebang

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import UNSET

from pre_commit.envcontext import Var

from pre_commit.hook import Hook

from pre_commit.languages import helpers

from pre_commit.languages.python import bin_dir

from pre_commit.prefix import Prefix

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

ENVIRONMENT_DIR = 'node_env'

healthy = helpers.basic_healthy

@functools.lru_cache(maxsize=1)

def get_default_version() -> str:

# nodeenv does not yet support `-n system` on windows

if sys.platform == 'win32':

return C.DEFAULT

# if node is already installed, we can save a bunch of setup time by

# using the installed version

elif all(parse_shebang.find_executable(exe) for exe in ('node', 'npm')):

return 'system'

else:

return C.DEFAULT

def _envdir(prefix: Prefix, version: str) -> str:

directory = helpers.environment_dir(ENVIRONMENT_DIR, version)

return prefix.path(directory)

def get_env_patch(venv: str) -> PatchesT:

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

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

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

lib_dir = 'lib'

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

install_prefix = bin_dir(venv)

lib_dir = 'Scripts'

else: # pragma: win32 no cover

install_prefix = venv

lib_dir = 'lib'

return (

('NODE_VIRTUAL_ENV', venv),

('NPM_CONFIG_PREFIX', install_prefix),

('npm_config_prefix', install_prefix),

('NPM_CONFIG_USERCONFIG', UNSET),

('npm_config_userconfig', UNSET),

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

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

)

@contextlib.contextmanager

def in_env(

prefix: Prefix,

language_version: str,

) -> Generator[None, None, None]:

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

yield

def install_environment(

prefix: Prefix, version: str, additional_dependencies: Sequence[str],

) -> None:

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 = fr'\\?\{os.path.normpath(envdir)}'

with clean_path_on_failure(envdir):

cmd = [

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

]

if version != C.DEFAULT:

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

cmd_output_b(*cmd)

with in_env(prefix, version):

# https://npm.community/t/npm-install-g-git-vs-git-clone-cd-npm-install-g/5449

# install as if we installed from git

helpers.run_setup_cmd(prefix, ('npm', 'install'))

helpers.run_setup_cmd(

prefix,

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

)

def run_hook(

hook: Hook,

file_args: Sequence[str],

color: bool,

) -> Tuple[int, bytes]:

with in_env(hook.prefix, hook.language_version):

return helpers.run_xargs(hook, hook.cmd, file_args, color=color)

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