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from __future__ import annotations

import argparse

from typing import Iterable

from typing import Iterator

from typing import Sequence

from pre_commit_hooks.util import added_files

from pre_commit_hooks.util import cmd_output

def lower_set(iterable: Iterable[str]) -> set[str]:

return {x.lower() for x in iterable}

def parents(file: str) -> Iterator[str]:

path_parts = file.split('/')

path_parts.pop()

while path_parts:

yield '/'.join(path_parts)

path_parts.pop()

def directories_for(files: set[str]) -> set[str]:

return {parent for file in files for parent in parents(file)}

def find_conflicting_filenames(filenames: Sequence[str]) -> int:

repo_files = set(cmd_output('git', 'ls-files').splitlines())

repo_files |= directories_for(repo_files)

relevant_files = set(filenames) | added_files()

relevant_files |= directories_for(relevant_files)

repo_files -= relevant_files

retv = 0

# new file conflicts with existing file

conflicts = lower_set(repo_files) & lower_set(relevant_files)

# new file conflicts with other new file

lowercase_relevant_files = lower_set(relevant_files)

for filename in set(relevant_files):

if filename.lower() in lowercase_relevant_files:

lowercase_relevant_files.remove(filename.lower())

else:

conflicts.add(filename.lower())

if conflicts:

conflicting_files = [

x for x in repo_files | relevant_files

if x.lower() in conflicts

]

for filename in sorted(conflicting_files):

print(f'Case-insensitivity conflict found: {filename}')

retv = 1

return retv

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

parser = argparse.ArgumentParser()

parser.add_argument(

'filenames', nargs='*',

help='Filenames pre-commit believes are changed.',

)

args = parser.parse_args(argv)

return find_conflicting_filenames(args.filenames)

if __name__ == '__main__':

raise SystemExit(main())

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