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from __future__ import annotations
import argparse
import os
from typing import Sequence
def _fix_file(
filename: str,
is_markdown: bool,
chars: bytes | None,
) -> bool:
with open(filename, mode='rb') as file_processed:
lines = file_processed.readlines()
newlines = [_process_line(line, is_markdown, chars) for line in lines]
if newlines != lines:
with open(filename, mode='wb') as file_processed:
for line in newlines:
file_processed.write(line)
return True
else:
return False
def _process_line(
line: bytes,
is_markdown: bool,
chars: bytes | None,
) -> bytes:
if line[-2:] == b'\r\n':
eol = b'\r\n'
line = line[:-2]
elif line[-1:] == b'\n':
eol = b'\n'
line = line[:-1]
else:
eol = b''
# preserve trailing two-space for non-blank lines in markdown files
if is_markdown and (not line.isspace()) and line.endswith(b' '):
return line[:-2].rstrip(chars) + b' ' + eol
return line.rstrip(chars) + eol
def main(argv: Sequence[str] | None = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument(
'--no-markdown-linebreak-ext',
action='store_true',
help=argparse.SUPPRESS,
)
parser.add_argument(
'--markdown-linebreak-ext',
action='append',
default=[],
metavar='*|EXT[,EXT,...]',
help=(
'Markdown extensions (or *) to not strip linebreak spaces. '
'default: %(default)s'
),
)
parser.add_argument(
'--chars',
help=(
'The set of characters to strip from the end of lines. '
'Defaults to all whitespace characters.'
),
)
parser.add_argument('filenames', nargs='*', help='Filenames to fix')
args = parser.parse_args(argv)
if args.no_markdown_linebreak_ext:
print('--no-markdown-linebreak-ext now does nothing!')
md_args = args.markdown_linebreak_ext
if '' in md_args:
parser.error('--markdown-linebreak-ext requires a non-empty argument')
all_markdown = '*' in md_args
# normalize extensions; split at ',', lowercase, and force 1 leading '.'
md_exts = [
'.' + x.lower().lstrip('.') for x in ','.join(md_args).split(',')
]
# reject probable "eaten" filename as extension: skip leading '.' with [1:]
for ext in md_exts:
if any(c in ext[1:] for c in r'./\:'):
parser.error(
f'bad --markdown-linebreak-ext extension '
f'{ext!r} (has . / \\ :)\n'
f" (probably filename; use '--markdown-linebreak-ext=EXT')",
)
chars = None if args.chars is None else args.chars.encode()
return_code = 0
for filename in args.filenames:
_, extension = os.path.splitext(filename.lower())
md = all_markdown or extension in md_exts
if _fix_file(filename, md, chars):
print(f'Fixing {filename}')
return_code = 1
return return_code
if __name__ == '__main__':
raise SystemExit(main())
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