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from __future__ import annotations

import json

import logging

import os

from typing import Any

from typing import Sequence

import pre_commit.constants as C

from pre_commit.clientlib import load_manifest

from pre_commit.clientlib import LOCAL

from pre_commit.clientlib import META

from pre_commit.hook import Hook

from pre_commit.languages.all import languages

from pre_commit.languages.helpers import environment_dir

from pre_commit.prefix import Prefix

from pre_commit.store import Store

from pre_commit.util import parse_version

from pre_commit.util import rmtree

logger = logging.getLogger('pre_commit')

def _state(additional_deps: Sequence[str]) -> object:

return {'additional_dependencies': sorted(additional_deps)}

def _state_filename(prefix: Prefix, venv: str) -> str:

return prefix.path(venv, f'.install_state_v{C.INSTALLED_STATE_VERSION}')

def _read_state(prefix: Prefix, venv: str) -> object | None:

filename = _state_filename(prefix, venv)

if not os.path.exists(filename):

return None

else:

with open(filename) as f:

return json.load(f)

def _write_state(prefix: Prefix, venv: str, state: object) -> None:

state_filename = _state_filename(prefix, venv)

staging = f'{state_filename}staging'

with open(staging, 'w') as state_file:

state_file.write(json.dumps(state))

# Move the file into place atomically to indicate we've installed

os.replace(staging, state_filename)

def _hook_installed(hook: Hook) -> bool:

lang = languages[hook.language]

venv = environment_dir(lang.ENVIRONMENT_DIR, hook.language_version)

return (

venv is None or (

(

_read_state(hook.prefix, venv) ==

_state(hook.additional_dependencies)

) and

lang.healthy(hook.prefix, hook.language_version)

)

def _hook_install(hook: Hook) -> None:

logger.info(f'Installing environment for {hook.src}.')

logger.info('Once installed this environment will be reused.')

logger.info('This may take a few minutes...')

lang = languages[hook.language]

assert lang.ENVIRONMENT_DIR is not None

venv = environment_dir(lang.ENVIRONMENT_DIR, hook.language_version)

# There's potentially incomplete cleanup from previous runs

# Clean it up!

if hook.prefix.exists(venv):

rmtree(hook.prefix.path(venv))

lang.install_environment(

hook.prefix, hook.language_version, hook.additional_dependencies,

)

if not lang.healthy(hook.prefix, hook.language_version):

raise AssertionError(

f'BUG: expected environment for {hook.language} to be healthy() '

f'immediately after install, please open an issue describing '

f'your environment',

)

# Write our state to indicate we're installed

_write_state(hook.prefix, venv, _state(hook.additional_dependencies))

def _hook(

*hook_dicts: dict[str, Any],

root_config: dict[str, Any],

) -> dict[str, Any]:

ret, rest = dict(hook_dicts[0]), hook_dicts[1:]

for dct in rest:

ret.update(dct)

version = ret['minimum_pre_commit_version']

if parse_version(version) > parse_version(C.VERSION):

logger.error(

f'The hook `{ret["id"]}` requires pre-commit version {version} '

f'but version {C.VERSION} is installed. '

f'Perhaps run `pip install --upgrade pre-commit`.',

)

exit(1)

lang = ret['language']

if ret['language_version'] == C.DEFAULT:

ret['language_version'] = root_config['default_language_version'][lang]

if ret['language_version'] == C.DEFAULT:

ret['language_version'] = languages[lang].get_default_version()

if not ret['stages']:

ret['stages'] = root_config['default_stages']

if languages[lang].ENVIRONMENT_DIR is None:

if ret['language_version'] != C.DEFAULT:

logger.error(

f'The hook `{ret["id"]}` specifies `language_version` but is '

f'using language `{lang}` which does not install an '

f'environment. '

f'Perhaps you meant to use a specific language?',

)

exit(1)

if ret['additional_dependencies']:

logger.error(

f'The hook `{ret["id"]}` specifies `additional_dependencies` '

f'but is using language `{lang}` which does not install an '

f'environment. '

f'Perhaps you meant to use a specific language?',

)

exit(1)

return ret

def _non_cloned_repository_hooks(

repo_config: dict[str, Any],

store: Store,

root_config: dict[str, Any],

) -> tuple[Hook, ...]:

def _prefix(language_name: str, deps: Sequence[str]) -> Prefix:

language = languages[language_name]

# pygrep / script / system / docker_image do not have

# environments so they work out of the current directory

if language.ENVIRONMENT_DIR is None:

return Prefix(os.getcwd())

else:

return Prefix(store.make_local(deps))

return tuple(

Hook.create(

repo_config['repo'],

_prefix(hook['language'], hook['additional_dependencies']),

_hook(hook, root_config=root_config),

)

for hook in repo_config['hooks']

)

def _cloned_repository_hooks(

repo_config: dict[str, Any],

store: Store,

root_config: dict[str, Any],

) -> tuple[Hook, ...]:

repo, rev = repo_config['repo'], repo_config['rev']

manifest_path = os.path.join(store.clone(repo, rev), C.MANIFEST_FILE)

by_id = {hook['id']: hook for hook in load_manifest(manifest_path)}

for hook in repo_config['hooks']:

if hook['id'] not in by_id:

logger.error(

f'`{hook["id"]}` is not present in repository {repo}. '

f'Typo? Perhaps it is introduced in a newer version? '

f'Often `pre-commit autoupdate` fixes this.',

)

exit(1)

hook_dcts = [

_hook(by_id[hook['id']], hook, root_config=root_config)

for hook in repo_config['hooks']

]

return tuple(

Hook.create(

repo_config['repo'],

Prefix(store.clone(repo, rev, hook['additional_dependencies'])),

hook,

)

for hook in hook_dcts

)

def _repository_hooks(

repo_config: dict[str, Any],

store: Store,

root_config: dict[str, Any],

) -> tuple[Hook, ...]:

if repo_config['repo'] in {LOCAL, META}:

return _non_cloned_repository_hooks(repo_config, store, root_config)

else:

return _cloned_repository_hooks(repo_config, store, root_config)

def install_hook_envs(hooks: Sequence[Hook], store: Store) -> None:

def _need_installed() -> list[Hook]:

seen: set[tuple[Prefix, str, str, tuple[str, ...]]] = set()

ret = []

for hook in hooks:

if hook.install_key not in seen and not _hook_installed(hook):

ret.append(hook)

seen.add(hook.install_key)

return ret

if not _need_installed():

return

with store.exclusive_lock():

# Another process may have already completed this work

for hook in _need_installed():

_hook_install(hook)

def all_hooks(root_config: dict[str, Any], store: Store) -> tuple[Hook, ...]:

return tuple(

hook

for repo in root_config['repos']

for hook in _repository_hooks(repo, store, root_config)

)

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PL/B Language Development and Support

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