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import contextlib

import functools

import os

import sys

from typing import Callable

from typing import ContextManager

from typing import Generator

from typing import Optional

from typing import Sequence

from typing import Tuple

import pre_commit.constants as C

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import PatchesT

from pre_commit.envcontext import UNSET

from pre_commit.envcontext import Var

from pre_commit.hook import Hook

from pre_commit.languages import helpers

from pre_commit.parse_shebang import find_executable

from pre_commit.prefix import Prefix

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: str) -> str:

"""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: str) -> PatchesT:

return (

('PYTHONHOME', UNSET),

('VIRTUAL_ENV', venv),

('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),

)

def _find_by_py_launcher(

version: str,

) -> Optional[str]: # pragma: no cover (windows only)

if version.startswith('python'):

num = version[len('python'):]

try:

cmd = ('py', f'-{num}', '-c', 'import sys; print(sys.executable)')

return cmd_output(*cmd)[1].strip()

except CalledProcessError:

pass

return None

def _find_by_sys_executable() -> Optional[str]:

def _norm(path: str) -> Optional[str]:

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

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

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

return exe

return None

# 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

@functools.lru_cache(maxsize=1)

def get_default_version() -> str: # 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 = f'python{sys.version_info[0]}.{sys.version_info[1]}'

if find_executable(exe):

return exe

if _find_by_py_launcher(exe):

return exe

# Give a best-effort try for windows

default_folder_name = exe.replace('.', '')

if os.path.exists(fr'C:\{default_folder_name}\python.exe'):

return exe

# We tried!

return C.DEFAULT

def _sys_executable_matches(version: str) -> bool:

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: str) -> str:

# 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'):

default_folder_name = version.replace('.', '')

return fr'C:\{default_folder_name}\python.exe'

# Otherwise assume it is a path

return os.path.expanduser(version)

def py_interface(

_dir: str,

_make_venv: Callable[[str, str], None],

) -> Tuple[

Callable[[Prefix, str], ContextManager[None]],

Callable[[Prefix, str], bool],

Callable[[Hook, Sequence[str], bool], Tuple[int, bytes]],

Callable[[Prefix, str, Sequence[str]], None],

@contextlib.contextmanager

def in_env(

prefix: Prefix,

language_version: str,

) -> Generator[None, None, None]:

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

with envcontext(get_env_patch(envdir)):

yield

def healthy(prefix: Prefix, language_version: str) -> bool:

envdir = helpers.environment_dir(_dir, language_version)

exe_name = 'python.exe' if sys.platform == 'win32' else 'python'

py_exe = prefix.path(bin_dir(envdir), exe_name)

with in_env(prefix, language_version):

retcode, _, _ = cmd_output_b(

py_exe, '-c', 'import ctypes, datetime, io, os, ssl, weakref',

cwd='/',

retcode=None,

)

return retcode == 0

def run_hook(

hook: Hook,

file_args: Sequence[str],

color: bool,

) -> Tuple[int, bytes]:

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

return helpers.run_xargs(hook, hook.cmd, file_args, color=color)

def install_environment(

prefix: Prefix,

version: str,

additional_dependencies: Sequence[str],

) -> None:

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: str, python: str) -> None:

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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