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import contextlib

import os

from typing import Generator

from typing import Sequence

from typing import Tuple

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import SubstitutionT

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.prefix import Prefix

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output_b

ENVIRONMENT_DIR = 'conda'

get_default_version = helpers.basic_get_default_version

healthy = helpers.basic_healthy

def get_env_patch(env: str) -> PatchesT:

# On non-windows systems executable live in $CONDA_PREFIX/bin, on Windows

# they can be in $CONDA_PREFIX/bin, $CONDA_PREFIX/Library/bin,

# $CONDA_PREFIX/Scripts and $CONDA_PREFIX. Whereas the latter only

# seems to be used for python.exe.

path: SubstitutionT = (os.path.join(env, 'bin'), os.pathsep, Var('PATH'))

if os.name == 'nt': # pragma: no cover (platform specific)

path = (env, os.pathsep, *path)

path = (os.path.join(env, 'Scripts'), os.pathsep, *path)

path = (os.path.join(env, 'Library', 'bin'), os.pathsep, *path)

return (

('PYTHONHOME', UNSET),

('VIRTUAL_ENV', UNSET),

('CONDA_PREFIX', env),

('PATH', path),

)

@contextlib.contextmanager

def in_env(

prefix: Prefix,

language_version: str,

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

directory = helpers.environment_dir(ENVIRONMENT_DIR, language_version)

envdir = prefix.path(directory)

with envcontext(get_env_patch(envdir)):

yield

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

helpers.assert_version_default('conda', version)

directory = helpers.environment_dir(ENVIRONMENT_DIR, version)

env_dir = prefix.path(directory)

with clean_path_on_failure(env_dir):

cmd_output_b(

'conda', 'env', 'create', '-p', env_dir, '--file',

'environment.yml', cwd=prefix.prefix_dir,

)

if additional_dependencies:

cmd_output_b(

'conda', 'install', '-p', env_dir, *additional_dependencies,

cwd=prefix.prefix_dir,

)

def run_hook(

hook: Hook,

file_args: Sequence[str],

color: bool,

) -> Tuple[int, bytes]:

# TODO: Some rare commands need to be run using `conda run` but mostly we

# can run them withot which is much quicker and produces a better

# output.

# cmd = ('conda', 'run', '-p', env_dir) + hook.cmd

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

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

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