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from __future__ import unicode_literals

import collections

import io

import json

import logging

import os

import pre_commit.constants as C

from pre_commit import five

from pre_commit.clientlib import load_manifest

from pre_commit.clientlib import LOCAL

from pre_commit.clientlib import MANIFEST_HOOK_DICT

from pre_commit.clientlib import META

from pre_commit.languages.all import languages

from pre_commit.languages.helpers import environment_dir

from pre_commit.prefix import Prefix

from pre_commit.util import parse_version

from pre_commit.util import rmtree

logger = logging.getLogger('pre_commit')

def _state(additional_deps):

return {'additional_dependencies': sorted(additional_deps)}

def _state_filename(prefix, venv):

return prefix.path(venv, '.install_state_v' + C.INSTALLED_STATE_VERSION)

def _read_state(prefix, venv):

filename = _state_filename(prefix, venv)

if not os.path.exists(filename):

return None

else:

with io.open(filename) as f:

return json.load(f)

def _write_state(prefix, venv, state):

state_filename = _state_filename(prefix, venv)

staging = state_filename + 'staging'

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

state_file.write(five.to_text(json.dumps(state)))

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

os.rename(staging, state_filename)

_KEYS = tuple(item.key for item in MANIFEST_HOOK_DICT.items)

class Hook(collections.namedtuple('Hook', ('src', 'prefix') + _KEYS)):

__slots__ = ()

@property

def install_key(self):

return (

self.prefix,

self.language,

self.language_version,

tuple(self.additional_dependencies),

)

def installed(self):

lang = languages[self.language]

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

return (

venv is None or (

(

_read_state(self.prefix, venv) ==

_state(self.additional_dependencies)

) and

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

)

def install(self):

logger.info('Installing environment for {}.'.format(self.src))

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

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

lang = languages[self.language]

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

# There's potentially incomplete cleanup from previous runs

# Clean it up!

if self.prefix.exists(venv):

rmtree(self.prefix.path(venv))

lang.install_environment(

self.prefix, self.language_version, self.additional_dependencies,

)

# Write our state to indicate we're installed

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

def run(self, file_args):

lang = languages[self.language]

return lang.run_hook(self, file_args)

@classmethod

def create(cls, src, prefix, dct):

# TODO: have cfgv do this (?)

extra_keys = set(dct) - set(_KEYS)

if extra_keys:

logger.warning(

'Unexpected keys present on {} => {}: '

'{}'.format(src, dct['id'], ', '.join(sorted(extra_keys))),

)

return cls(src=src, prefix=prefix, **{k: dct[k] for k in _KEYS})

def _hook(*hook_dicts, **kwargs):

root_config = kwargs.pop('root_config')

assert not kwargs, kwargs

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(

'The hook `{}` requires pre-commit version {} but version {} '

'is installed. '

'Perhaps run `pip install --upgrade pre-commit`.'.format(

ret['id'], version, C.VERSION,

)

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']

return ret

def _non_cloned_repository_hooks(repo_config, store, root_config):

def _prefix(language_name, deps):

language = languages[language_name]

# pcre / 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, store, root_config):

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(

'`{}` is not present in repository {}. '

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

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

.format(hook['id'], repo),

)

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, store, root_config):

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, store):

def _need_installed():

seen = set()

ret = []

for hook in hooks:

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

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()

def all_hooks(root_config, store):

return tuple(

hook

for repo in root_config['repos']

for hook in _repository_hooks(repo, store, root_config)

)

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