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from __future__ import unicode_literals
import contextlib
import distutils.spawn
import os
import sys
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import UNSET
from pre_commit.envcontext import Var
from pre_commit.languages import helpers
from pre_commit.util import clean_path_on_failure
from pre_commit.xargs import xargs
ENVIRONMENT_DIR = 'py_env'
def bin_dir(venv):
"""On windows there's a different directory for the virtualenv"""
bin_part = 'Scripts' if os.name == 'nt' else 'bin'
return os.path.join(venv, bin_part)
def get_env_patch(venv):
return (
('PYTHONHOME', UNSET),
('VIRTUAL_ENV', venv),
('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
)
@contextlib.contextmanager
def in_env(repo_cmd_runner, language_version):
envdir = repo_cmd_runner.path(
helpers.environment_dir(ENVIRONMENT_DIR, language_version),
)
with envcontext(get_env_patch(envdir)):
yield
def norm_version(version):
if os.name == 'nt': # pragma: no cover (windows)
# Try looking up by name
if distutils.spawn.find_executable(version):
return version
# If it is in the form pythonx.x search in the default
# place on windows
if version.startswith('python'):
return r'C:\{}\python.exe'.format(version.replace('.', ''))
# Otherwise assume it is a path
return os.path.expanduser(version)
def install_environment(
repo_cmd_runner,
version='default',
additional_dependencies=(),
):
additional_dependencies = tuple(additional_dependencies)
directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
# Install a virtualenv
with clean_path_on_failure(repo_cmd_runner.path(directory)):
venv_cmd = [
sys.executable, '-m', 'virtualenv',
'{{prefix}}{}'.format(directory)
]
if version != 'default':
venv_cmd.extend(['-p', norm_version(version)])
else:
venv_cmd.extend(['-p', os.path.realpath(sys.executable)])
repo_cmd_runner.run(venv_cmd, cwd='/')
with in_env(repo_cmd_runner, version):
helpers.run_setup_cmd(
repo_cmd_runner,
('pip', 'install', '.') + additional_dependencies,
)
def run_hook(repo_cmd_runner, hook, file_args):
with in_env(repo_cmd_runner, hook['language_version']):
return xargs(helpers.to_cmd(hook), file_args)