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from __future__ import unicode_literals

import contextlib

import os

import sys

import pre_commit.constants as C

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.parse_shebang import find_executable

from pre_commit.util import CalledProcessError

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

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'))),

)

def _find_by_py_launcher(version): # pragma: no cover (windows only)

if version.startswith('python'):

try:

return cmd_output(

'py', '-{}'.format(version[len('python'):]),

'-c', 'import sys; print(sys.executable)',

)[1].strip()

except CalledProcessError:

pass

def _find_by_sys_executable():

def _norm(path):

_, exe = os.path.split(path.lower())

exe, _, _ = exe.partition('.exe')

if find_executable(exe) and exe not in {'python', 'pythonw'}:

return exe

# On linux, I see these common sys.executables:

# system `python`: /usr/bin/python -> python2.7

# system `python2`: /usr/bin/python2 -> python2.7

# virtualenv v: v/bin/python (will not return from this loop)

# virtualenv v -ppython2: v/bin/python -> python2

# virtualenv v -ppython2.7: v/bin/python -> python2.7

# virtualenv v -ppypy: v/bin/python -> v/bin/pypy

for path in (sys.executable, os.path.realpath(sys.executable)):

exe = _norm(path)

if exe:

return exe

return None

def _get_default_version(): # pragma: no cover (platform dependent)

# First attempt from `sys.executable` (or the realpath)

exe = _find_by_sys_executable()

if exe:

return exe

# Next try the `pythonX.X` executable

exe = 'python{}.{}'.format(*sys.version_info)

if find_executable(exe):

return exe

if _find_by_py_launcher(exe):

return exe

# Give a best-effort try for windows

if os.path.exists(r'C:\{}\python.exe'.format(exe.replace('.', ''))):

return exe

# We tried!

return C.DEFAULT

def get_default_version():

# TODO: when dropping python2, use `functools.lru_cache(maxsize=1)`

try:

return get_default_version.cached_version

except AttributeError:

get_default_version.cached_version = _get_default_version()

return get_default_version()

def _sys_executable_matches(version):

if version == 'python':

return True

elif not version.startswith('python'):

return False

try:

info = tuple(int(p) for p in version[len('python'):].split('.'))

except ValueError:

return False

return sys.version_info[:len(info)] == info

def norm_version(version):

# first see if our current executable is appropriate

if _sys_executable_matches(version):

return sys.executable

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

version_exec = _find_by_py_launcher(version)

if version_exec:

return version_exec

# Try looking up by name

version_exec = find_executable(version)

if version_exec and version_exec != version:

return version_exec

# 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 py_interface(_dir, _make_venv):

@contextlib.contextmanager

def in_env(prefix, language_version):

envdir = prefix.path(helpers.environment_dir(_dir, language_version))

with envcontext(get_env_patch(envdir)):

yield

def healthy(prefix, language_version):

with in_env(prefix, language_version):

retcode, _, _ = cmd_output_b(

'python', '-c',

'import ctypes, datetime, io, os, ssl, weakref',

retcode=None,

)

return retcode == 0

def run_hook(hook, file_args, color, progress):

with in_env(hook.prefix, hook.language_version):

return helpers.run_xargs(

hook, hook.cmd, file_args, color=color, progress=progress,

)

def install_environment(prefix, version, additional_dependencies):

additional_dependencies = tuple(additional_dependencies)

directory = helpers.environment_dir(_dir, version)

env_dir = prefix.path(directory)

with clean_path_on_failure(env_dir):

if version != C.DEFAULT:

python = norm_version(version)

else:

python = os.path.realpath(sys.executable)

_make_venv(env_dir, python)

with in_env(prefix, version):

helpers.run_setup_cmd(

prefix, ('pip', 'install', '.') + additional_dependencies,

)

return in_env, healthy, run_hook, install_environment

def make_venv(envdir, python):

env = dict(os.environ, VIRTUALENV_NO_DOWNLOAD='1')

cmd = (sys.executable, '-mvirtualenv', envdir, '-p', python)

cmd_output_b(*cmd, env=env, cwd='/')

_interface = py_interface(ENVIRONMENT_DIR, make_venv)

in_env, healthy, run_hook, install_environment = _interface

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