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from __future__ import annotations

import contextlib

import os.path

from collections.abc import Generator

from collections.abc import Sequence

from pre_commit import lang_base

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import Var

from pre_commit.errors import FatalError

from pre_commit.parse_shebang import find_executable

from pre_commit.prefix import Prefix

ENVIRONMENT_DIR = 'coursier'

get_default_version = lang_base.basic_get_default_version

health_check = lang_base.basic_health_check

run_hook = lang_base.basic_run_hook

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

lang_base.assert_version_default('coursier', version)

# Support both possible executable names (either "cs" or "coursier")

cs = find_executable('cs') or find_executable('coursier')

if cs is None:

raise AssertionError(

'pre-commit requires system-installed "cs" or "coursier" '

'executables in the application search path',

)

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

def _install(*opts: str) -> None:

assert cs is not None

lang_base.setup_cmd(prefix, (cs, 'fetch', *opts))

lang_base.setup_cmd(prefix, (cs, 'install', '--dir', envdir, *opts))

with in_env(prefix, version):

channel = prefix.path('.pre-commit-channel')

if os.path.isdir(channel):

for app_descriptor in os.listdir(channel):

_, app_file = os.path.split(app_descriptor)

app, _ = os.path.splitext(app_file)

_install(

'--default-channels=false',

'--channel', channel,

app,

)

elif not additional_dependencies:

raise FatalError(

'expected .pre-commit-channel dir or additional_dependencies',

)

if additional_dependencies:

_install(*additional_dependencies)

def get_env_patch(target_dir: str) -> PatchesT:

return (

('PATH', (target_dir, os.pathsep, Var('PATH'))),

('COURSIER_CACHE', os.path.join(target_dir, '.cs-cache')),

)

@contextlib.contextmanager

def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:

envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

with envcontext(get_env_patch(envdir)):

yield

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