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#!/usr/bin/env python3
"""Compare the `digest <frame> <time> <hex>` lines of two run logs (deterministic runs).
Usage: digest_compare.py A.log B.log → exit 0 when equal, 1 with the first difference.
"""
import sys
from pathlib import Path
def digests(path: str) -> list[str]:
return [line.strip() for line in Path(path).read_text(errors="replace").splitlines() if line.startswith("digest ")]
def main(argv: list[str]) -> int:
if len(argv) != 3:
print(__doc__.strip())
return 2
a, b = digests(argv[1]), digests(argv[2])
if not a and not b:
print("FAIL: no digest lines")
return 1
for k, (x, y) in enumerate(zip(a, b), 1):
if x != y:
print(f"FAIL: digest {k} differs\n {x}\n {y}")
return 1
if len(a) != len(b):
print(f"FAIL: {len(a)} vs {len(b)} digests")
return 1
print(f"ok: {len(a)} digests equal, last {a[-1]}")
return 0
if __name__ == "__main__":
sys.exit(main(sys.argv))
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