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"""
A very simple pre-commit hook that, when passed one or more filenames
as arguments, will sort the lines in those files.
An example use case for this: you have a deploy-allowlist.txt file
in a repo that contains a list of filenames that is used to specify
files to be included in a docker container. This file has one filename
per line. Various users are adding/removing lines from this file; using
this hook on that file should reduce the instances of git merge
conflicts and keep the file nicely ordered.
"""
from __future__ import annotations
import argparse
from typing import Any
from typing import Callable
from typing import IO
from typing import Iterable
from typing import Sequence
PASS = 0
FAIL = 1
def sort_file_contents(
f: IO[bytes],
key: Callable[[bytes], Any] | None,
*,
unique: bool = False,
) -> int:
before = list(f)
lines: Iterable[bytes] = (
line.rstrip(b'\n\r') for line in before if line.strip()
)
if unique:
lines = set(lines)
after = sorted(lines, key=key)
before_string = b''.join(before)
after_string = b'\n'.join(after) + b'\n'
if before_string == after_string:
return PASS
else:
f.seek(0)
f.write(after_string)
f.truncate()
return FAIL
def main(argv: Sequence[str] | None = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument('filenames', nargs='+', help='Files to sort')
parser.add_argument(
'--ignore-case',
action='store_const',
const=bytes.lower,
default=None,
help='fold lower case to upper case characters',
)
parser.add_argument(
'--unique',
action='store_true',
help='ensure each line is unique',
)
args = parser.parse_args(argv)
retv = PASS
for arg in args.filenames:
with open(arg, 'rb+') as file_obj:
ret_for_file = sort_file_contents(
file_obj, key=args.ignore_case, unique=args.unique,
)
if ret_for_file:
print(f'Sorting {arg}')
retv |= ret_for_file
return retv
if __name__ == '__main__':
raise SystemExit(main())
|
