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from __future__ import unicode_literals

import io

import json

import logging

import os

import shutil

from collections import defaultdict

import pkg_resources

from cached_property import cached_property

import pre_commit.constants as C

from pre_commit import five

from pre_commit import git

from pre_commit.clientlib import is_local_repo

from pre_commit.clientlib import MANIFEST_HOOK_DICT

from pre_commit.languages.all import languages

from pre_commit.languages.helpers import environment_dir

from pre_commit.manifest import Manifest

from pre_commit.prefixed_command_runner import PrefixedCommandRunner

from pre_commit.schema import apply_defaults

from pre_commit.schema import validate

logger = logging.getLogger('pre_commit')

def _state(additional_deps):

return {'additional_dependencies': sorted(additional_deps)}

def _state_filename(cmd_runner, venv):

return cmd_runner.path(

venv, '.install_state_v' + C.INSTALLED_STATE_VERSION,

)

def _read_installed_state(cmd_runner, venv):

filename = _state_filename(cmd_runner, venv)

if not os.path.exists(filename):

return None

else:

return json.loads(io.open(filename).read())

def _write_installed_state(cmd_runner, venv, state):

state_filename = _state_filename(cmd_runner, 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)

def _installed(cmd_runner, language_name, language_version, additional_deps):

language = languages[language_name]

venv = environment_dir(language.ENVIRONMENT_DIR, language_version)

return (

venv is None or

_read_installed_state(cmd_runner, venv) == _state(additional_deps)

)

def _install_all(venvs, repo_url):

"""Tuple of (cmd_runner, language, version, deps)"""

need_installed = tuple(

(cmd_runner, language_name, version, deps)

for cmd_runner, language_name, version, deps in venvs

if not _installed(cmd_runner, language_name, version, deps)

)

if need_installed:

logger.info(

'Installing environment for {}.'.format(repo_url),

)

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

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

for cmd_runner, language_name, version, deps in need_installed:

language = languages[language_name]

venv = environment_dir(language.ENVIRONMENT_DIR, version)

# There's potentially incomplete cleanup from previous runs

# Clean it up!

if cmd_runner.exists(venv):

shutil.rmtree(cmd_runner.path(venv))

language.install_environment(cmd_runner, version, deps)

# Write our state to indicate we're installed

state = _state(deps)

_write_installed_state(cmd_runner, venv, state)

def _validate_minimum_version(hook):

hook_version = pkg_resources.parse_version(

hook['minimum_pre_commit_version'],

)

if hook_version > C.VERSION_PARSED:

logger.error(

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

'version {} is installed. '

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

hook['id'], hook_version, C.VERSION_PARSED,

)

exit(1)

return hook

class Repository(object):

def __init__(self, repo_config, store):

self.repo_config = repo_config

self.store = store

self.__installed = False

@classmethod

def create(cls, config, store):

if is_local_repo(config):

return LocalRepository(config, store)

else:

return cls(config, store)

@cached_property

def _repo_path(self):

return self.store.clone(

self.repo_config['repo'], self.repo_config['sha'],

)

@cached_property

def _cmd_runner(self):

return PrefixedCommandRunner(self._repo_path)

def _cmd_runner_from_deps(self, language_name, deps):

return self._cmd_runner

@cached_property

def manifest(self):

return Manifest(self._repo_path, self.repo_config['repo'])

@cached_property

def hooks(self):

for hook in self.repo_config['hooks']:

if hook['id'] not in self.manifest.hooks:

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'], self.repo_config['repo'],

)

exit(1)

_validate_minimum_version(self.manifest.hooks[hook['id']])

return tuple(

(hook['id'], dict(self.manifest.hooks[hook['id']], **hook))

for hook in self.repo_config['hooks']

)

@cached_property

def _venvs(self):

deps_dict = defaultdict(_UniqueList)

for _, hook in self.hooks:

deps_dict[(hook['language'], hook['language_version'])].update(

hook['additional_dependencies'],

)

ret = []

for (language, version), deps in deps_dict.items():

ret.append((self._cmd_runner, language, version, deps))

return tuple(ret)

def require_installed(self):

if not self.__installed:

_install_all(self._venvs, self.repo_config['repo'])

self.__installed = True

def run_hook(self, hook, file_args):

"""Run a hook.

:param dict hook:

:param tuple file_args: all the files to run the hook on

"""

self.require_installed()

language_name = hook['language']

deps = hook['additional_dependencies']

cmd_runner = self._cmd_runner_from_deps(language_name, deps)

return languages[language_name].run_hook(cmd_runner, hook, file_args)

class LocalRepository(Repository):

def _cmd_runner_from_deps(self, language_name, deps):

"""local repositories have a cmd runner per hook"""

language = languages[language_name]

# pcre / script / system do not have environments so they work out

# of the current directory

if language.ENVIRONMENT_DIR is None:

return PrefixedCommandRunner(git.get_root())

else:

return PrefixedCommandRunner(self.store.make_local(deps))

@cached_property

def manifest(self):

raise NotImplementedError

@cached_property

def hooks(self):

return tuple(

(

hook['id'],

_validate_minimum_version(

apply_defaults(

validate(hook, MANIFEST_HOOK_DICT),

MANIFEST_HOOK_DICT,

)

for hook in self.repo_config['hooks']

)

@cached_property

def _venvs(self):

ret = []

for _, hook in self.hooks:

language = hook['language']

version = hook['language_version']

deps = hook['additional_dependencies']

ret.append((

self._cmd_runner_from_deps(language, deps),

language, version, deps,

))

return tuple(ret)

class _UniqueList(list):

def __init__(self):

self._set = set()

def update(self, obj):

for item in obj:

if item not in self._set:

self._set.add(item)

self.append(item)

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