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from __future__ import unicode_literals

import contextlib

import distutils.spawn

import os

import sys

import virtualenv

from pre_commit.languages import helpers

from pre_commit.util import clean_path_on_failure

ENVIRONMENT_DIR = 'py_env'

class PythonEnv(helpers.Environment):

@property

def env_prefix(self):

return ". '{{prefix}}{0}activate' &&".format(

virtualenv.path_locations(

ENVIRONMENT_DIR,

)[-1].rstrip(os.sep) + os.sep,

'activate',

)

@contextlib.contextmanager

def in_env(repo_cmd_runner):

yield PythonEnv(repo_cmd_runner)

def norm_version(version):

if os.name == 'nt': # pragma: no cover (windows)

if not distutils.spawn.find_executable(version):

# The default place for python on windows is:

# C:\PythonXX\python.exe

version = r'C:\{0}\python.exe'.format(version.replace('.', ''))

return version

def install_environment(repo_cmd_runner, version='default'):

assert repo_cmd_runner.exists('setup.py')

# Install a virtualenv

with clean_path_on_failure(repo_cmd_runner.path(ENVIRONMENT_DIR)):

venv_cmd = [

sys.executable, '-m', 'virtualenv',

'{{prefix}}{0}'.format(ENVIRONMENT_DIR)

]

if version != 'default':

venv_cmd.extend(['-p', norm_version(version)])

repo_cmd_runner.run(venv_cmd)

with in_env(repo_cmd_runner) as env:

env.run("cd '{prefix}' && pip install .")

def run_hook(repo_cmd_runner, hook, file_args):

with in_env(repo_cmd_runner) as env:

return helpers.run_hook(env, hook, file_args)

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