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from __future__ import annotations

import contextlib

import os.path

import shutil

import tempfile

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.prefix import Prefix

from pre_commit.util import win_exe

from pre_commit.yaml import yaml_load

ENVIRONMENT_DIR = 'dartenv'

get_default_version = lang_base.basic_get_default_version

health_check = lang_base.basic_health_check

run_hook = lang_base.basic_run_hook

def get_env_patch(venv: str) -> PatchesT:

return (

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

)

@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

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

lang_base.assert_version_default('dart', version)

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

bin_dir = os.path.join(envdir, 'bin')

def _install_dir(prefix_p: Prefix, pub_cache: str) -> None:

dart_env = {**os.environ, 'PUB_CACHE': pub_cache}

with open(prefix_p.path('pubspec.yaml')) as f:

pubspec_contents = yaml_load(f)

lang_base.setup_cmd(prefix_p, ('dart', 'pub', 'get'), env=dart_env)

for executable in pubspec_contents['executables']:

lang_base.setup_cmd(

prefix_p,

(

'dart', 'compile', 'exe',

'--output', os.path.join(bin_dir, win_exe(executable)),

prefix_p.path('bin', f'{executable}.dart'),

env=dart_env,

)

os.makedirs(bin_dir)

with tempfile.TemporaryDirectory() as tmp:

_install_dir(prefix, tmp)

for dep_s in additional_dependencies:

with tempfile.TemporaryDirectory() as dep_tmp:

dep, _, version = dep_s.partition(':')

if version:

dep_cmd: tuple[str, ...] = (dep, '--version', version)

else:

dep_cmd = (dep,)

lang_base.setup_cmd(

prefix,

('dart', 'pub', 'cache', 'add', *dep_cmd),

env={**os.environ, 'PUB_CACHE': dep_tmp},

)

# try and find the 'pubspec.yaml' that just got added

for root, _, filenames in os.walk(dep_tmp):

if 'pubspec.yaml' in filenames:

with tempfile.TemporaryDirectory() as copied:

pkg = os.path.join(copied, 'pkg')

shutil.copytree(root, pkg)

_install_dir(Prefix(pkg), dep_tmp)

break

else:

raise AssertionError(

f'could not find pubspec.yaml for {dep_s}',

)

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PL/B Language Development and Support

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