"""Install (or --check) the tracked pre-commit hook. Tolk pattern: edit tracked source, never .git/hooks directly."""
import shutil
import stat
import sys
from pathlib import Path

SRC = Path("scripts/hooks/pre-commit.sh")
DST = Path(".git/hooks/pre-commit")

def main() -> int:
    if "--check" in sys.argv:
        drifted = (not DST.exists()) or DST.read_bytes() != SRC.read_bytes()
        print("hook DRIFTED" if drifted else "hook ok")
        return 1 if drifted else 0
    shutil.copyfile(SRC, DST)
    DST.chmod(DST.stat().st_mode | stat.S_IEXEC)
    print(f"installed {SRC} -> {DST}")
    return 0

if __name__ == "__main__":
    sys.exit(main())