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import contextlib

import functools

import os.path

import sys

import traceback

from typing import Generator

import pre_commit.constants as C

from pre_commit import output

from pre_commit.store import Store

from pre_commit.util import force_bytes

class FatalError(RuntimeError):

pass

def _log_and_exit(msg: str, exc: BaseException, formatted: str) -> None:

error_msg = f'{msg}: {type(exc).__name__}: '.encode() + force_bytes(exc)

output.write_line_b(error_msg)

storedir = Store().directory

log_path = os.path.join(storedir, 'pre-commit.log')

with contextlib.ExitStack() as ctx:

if os.access(storedir, os.W_OK):

output.write_line(f'Check the log at {log_path}')

log = ctx.enter_context(open(log_path, 'wb'))

else: # pragma: win32 no cover

output.write_line(f'Failed to write to log at {log_path}')

log = sys.stdout.buffer

_log_line = functools.partial(output.write_line, stream=log)

_log_line_b = functools.partial(output.write_line_b, stream=log)

_log_line('### version information')

_log_line()

_log_line('```')

_log_line(f'pre-commit version: {C.VERSION}')

_log_line('sys.version:')

for line in sys.version.splitlines():

_log_line(f' {line}')

_log_line(f'sys.executable: {sys.executable}')

_log_line(f'os.name: {os.name}')

_log_line(f'sys.platform: {sys.platform}')

_log_line('```')

_log_line()

_log_line('### error information')

_log_line()

_log_line('```')

_log_line_b(error_msg)

_log_line('```')

_log_line()

_log_line('```')

_log_line(formatted)

_log_line('```')

raise SystemExit(1)

@contextlib.contextmanager

def error_handler() -> Generator[None, None, None]:

try:

yield

except (Exception, KeyboardInterrupt) as e:

if isinstance(e, FatalError):

msg = 'An error has occurred'

elif isinstance(e, KeyboardInterrupt):

msg = 'Interrupted (^C)'

else:

msg = 'An unexpected error has occurred'

_log_and_exit(msg, e, traceback.format_exc())

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