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import argparse

import re

from typing import AbstractSet

from typing import Optional

from typing import Sequence

from pre_commit_hooks.util import CalledProcessError

from pre_commit_hooks.util import cmd_output

def is_on_branch(

protected: AbstractSet[str],

patterns: AbstractSet[str] = frozenset(),

) -> bool:

try:

ref_name = cmd_output('git', 'symbolic-ref', 'HEAD')

except CalledProcessError:

return False

chunks = ref_name.strip().split('/')

branch_name = '/'.join(chunks[2:])

return branch_name in protected or any(

re.match(p, branch_name) for p in patterns

)

def main(argv: Optional[Sequence[str]] = None) -> int:

parser = argparse.ArgumentParser()

parser.add_argument(

'-b', '--branch', action='append',

help='branch to disallow commits to, may be specified multiple times',

)

parser.add_argument(

'-p', '--pattern', action='append',

help=(

'regex pattern for branch name to disallow commits to, '

'may be specified multiple times'

)

args = parser.parse_args(argv)

protected = frozenset(args.branch or ('master',))

patterns = frozenset(args.pattern or ())

return int(is_on_branch(protected, patterns))

if __name__ == '__main__':

exit(main())

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