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from __future__ import annotations

import contextlib

import logging

import os.path

import time

from collections.abc import Generator

from pre_commit import git

from pre_commit.errors import FatalError

from pre_commit.util import CalledProcessError

from pre_commit.util import cmd_output

from pre_commit.util import cmd_output_b

from pre_commit.xargs import xargs

logger = logging.getLogger('pre_commit')

# without forcing submodule.recurse=0, changes in nested submodules will be

# discarded if `submodule.recurse=1` is configured

# we choose this instead of `--no-recurse-submodules` because it works on

# versions of git before that option was added to `git checkout`

_CHECKOUT_CMD = ('git', '-c', 'submodule.recurse=0', 'checkout', '--', '.')

def _git_apply(patch: str) -> None:

args = ('apply', '--whitespace=nowarn', patch)

try:

cmd_output_b('git', *args)

except CalledProcessError:

# Retry with autocrlf=false -- see #570

cmd_output_b('git', '-c', 'core.autocrlf=false', *args)

@contextlib.contextmanager

def _intent_to_add_cleared() -> Generator[None]:

intent_to_add = git.intent_to_add_files()

if intent_to_add:

logger.warning('Unstaged intent-to-add files detected.')

xargs(('git', 'rm', '--cached', '--'), intent_to_add)

try:

yield

finally:

xargs(('git', 'add', '--intent-to-add', '--'), intent_to_add)

else:

yield

@contextlib.contextmanager

def _unstaged_changes_cleared(patch_dir: str) -> Generator[None]:

tree = cmd_output('git', 'write-tree')[1].strip()

diff_cmd = (

'git', 'diff-index', '--ignore-submodules', '--binary',

'--exit-code', '--no-color', '--no-ext-diff', tree, '--',

)

retcode, diff_stdout, diff_stderr = cmd_output_b(*diff_cmd, check=False)

if retcode == 0:

# There weren't any staged files so we don't need to do anything

# special

yield

elif retcode == 1 and not diff_stdout.strip():

# due to behaviour (probably a bug?) in git with crlf endings and

# autocrlf set to either `true` or `input` sometimes git will refuse

# to show a crlf-only diff to us :(

yield

elif retcode == 1 and diff_stdout.strip():

patch_filename = f'patch{int(time.time())}-{os.getpid()}'

patch_filename = os.path.join(patch_dir, patch_filename)

logger.warning('Unstaged files detected.')

logger.info(f'Stashing unstaged files to {patch_filename}.')

# Save the current unstaged changes as a patch

os.makedirs(patch_dir, exist_ok=True)

with open(patch_filename, 'wb') as patch_file:

patch_file.write(diff_stdout)

# prevent recursive post-checkout hooks (#1418)

no_checkout_env = dict(os.environ, _PRE_COMMIT_SKIP_POST_CHECKOUT='1')

try:

cmd_output_b(*_CHECKOUT_CMD, env=no_checkout_env)

yield

finally:

# Try to apply the patch we saved

try:

_git_apply(patch_filename)

except CalledProcessError:

logger.warning(

'Stashed changes conflicted with hook auto-fixes... '

'Rolling back fixes...',

)

# We failed to apply the patch, presumably due to fixes made

# by hooks.

# Roll back the changes made by hooks.

cmd_output_b(*_CHECKOUT_CMD, env=no_checkout_env)

_git_apply(patch_filename)

logger.info(f'Restored changes from {patch_filename}.')

else: # pragma: win32 no cover

# some error occurred while requesting the diff

e = CalledProcessError(retcode, diff_cmd, b'', diff_stderr)

raise FatalError(

f'pre-commit failed to diff -- perhaps due to permissions?\n\n{e}',

)

@contextlib.contextmanager

def staged_files_only(patch_dir: str) -> Generator[None]:

"""Clear any unstaged changes from the git working directory inside this

context.

"""

with _intent_to_add_cleared(), _unstaged_changes_cleared(patch_dir):

yield

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