"""简单的文件锁标记工具。"""

from __future__ import annotations

from os import PathLike
from pathlib import Path


def is_lock(file_path: str | PathLike[str]) -> bool:
    """判断指定的锁文件是否存在。"""
    return Path(file_path).is_file()


def write_lockfile(file_path: str | PathLike[str]) -> None:
    """创建锁文件；父目录不存在时自动创建。"""
    path = Path(file_path)
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text("LOCK", encoding="utf-8")