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from __future__ import annotations
import argparse
import collections
from typing import Sequence
CRLF = b'\r\n'
LF = b'\n'
CR = b'\r'
# Prefer LF to CRLF to CR, but detect CRLF before LF
ALL_ENDINGS = (CR, CRLF, LF)
FIX_TO_LINE_ENDING = {'cr': CR, 'crlf': CRLF, 'lf': LF}
def _fix(filename: str, contents: bytes, ending: bytes) -> None:
new_contents = b''.join(
line.rstrip(b'\r\n') + ending for line in contents.splitlines(True)
)
with open(filename, 'wb') as f:
f.write(new_contents)
def fix_filename(filename: str, fix: str) -> int:
with open(filename, 'rb') as f:
contents = f.read()
counts: dict[bytes, int] = collections.defaultdict(int)
for line in contents.splitlines(True):
for ending in ALL_ENDINGS:
if line.endswith(ending):
counts[ending] += 1
break
# Some amount of mixed line endings
mixed = sum(bool(x) for x in counts.values()) > 1
if fix == 'no' or (fix == 'auto' and not mixed):
return mixed
if fix == 'auto':
max_ending = LF
max_lines = 0
# ordering is important here such that lf > crlf > cr
for ending_type in ALL_ENDINGS:
# also important, using >= to find a max that prefers the last
if counts[ending_type] >= max_lines:
max_ending = ending_type
max_lines = counts[ending_type]
_fix(filename, contents, max_ending)
return 1
else:
target_ending = FIX_TO_LINE_ENDING[fix]
# find if there are lines with *other* endings
# It's possible there's no line endings of the target type
counts.pop(target_ending, None)
other_endings = bool(sum(counts.values()))
if other_endings:
_fix(filename, contents, target_ending)
return other_endings
def main(argv: Sequence[str] | None = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument(
'-f', '--fix',
choices=('auto', 'no') + tuple(FIX_TO_LINE_ENDING),
default='auto',
help='Replace line ending with the specified. Default is "auto"',
)
parser.add_argument('filenames', nargs='*', help='Filenames to fix')
args = parser.parse_args(argv)
retv = 0
for filename in args.filenames:
if fix_filename(filename, args.fix):
if args.fix == 'no':
print(f'{filename}: mixed line endings')
else:
print(f'{filename}: fixed mixed line endings')
retv = 1
return retv
if __name__ == '__main__':
raise SystemExit(main())
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