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import argparse

from typing import Any

from typing import Generator

from typing import NamedTuple

from typing import Optional

from typing import Sequence

import ruamel.yaml

yaml = ruamel.yaml.YAML(typ='safe')

def _exhaust(gen: Generator[str, None, None]) -> None:

for _ in gen:

pass

def _parse_unsafe(*args: Any, **kwargs: Any) -> None:

_exhaust(yaml.parse(*args, **kwargs))

def _load_all(*args: Any, **kwargs: Any) -> None:

_exhaust(yaml.load_all(*args, **kwargs))

class Key(NamedTuple):

multi: bool

unsafe: bool

LOAD_FNS = {

Key(multi=False, unsafe=False): yaml.load,

Key(multi=False, unsafe=True): _parse_unsafe,

Key(multi=True, unsafe=False): _load_all,

Key(multi=True, unsafe=True): _parse_unsafe,

}

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

parser = argparse.ArgumentParser()

parser.add_argument(

'-m', '--multi', '--allow-multiple-documents', action='store_true',

)

parser.add_argument(

'--unsafe', action='store_true',

help=(

'Instead of loading the files, simply parse them for syntax. '

'A syntax-only check enables extensions and unsafe contstructs '

'which would otherwise be forbidden. Using this option removes '

'all guarantees of portability to other yaml implementations. '

'Implies --allow-multiple-documents'

)

parser.add_argument('filenames', nargs='*', help='Filenames to check.')

args = parser.parse_args(argv)

load_fn = LOAD_FNS[Key(multi=args.multi, unsafe=args.unsafe)]

retval = 0

for filename in args.filenames:

try:

with open(filename, encoding='UTF-8') as f:

load_fn(f)

except ruamel.yaml.YAMLError as exc:

print(exc)

retval = 1

return retval

if __name__ == '__main__':

exit(main())

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