#!/usr/bin/env python3
"""drop_row.py -- remove ledger rows for paths named on argv.

Q150: the runner ledger and the rc-probe ledger each carry a row for
`wizard-work/spark/verify_lwc.py`, a verifier retired at `a979e63` (Q125).
A row that describes a file absent at HEAD is not evidence about the tree, and
neither tool prunes rows (both emit only what they ran), so the removal is
explicit and printed: every dropped line is echoed before it goes.
"""
import sys

path = sys.argv[1]
targets = set(sys.argv[2:])
if not targets:
    sys.exit("usage: drop_row.py <ledger.tsv> <path> [<path> ...]")

kept, dropped = [], []
with open(path, encoding="utf-8") as fh:
    for line in fh:
        parts = line.rstrip("\n").split("\t")
        if len(parts) > 1 and parts[1] in targets:
            dropped.append(line.rstrip("\n"))
        else:
            kept.append(line.rstrip("\n"))
for d in dropped:
    print("dropped: " + d)
if not dropped:
    print("no row matched; file unchanged")
    sys.exit(0)
with open(path, "w", encoding="utf-8") as fh:
    fh.write("\n".join(kept) + "\n")
print("rows: %d -> %d" % (len(kept) + len(dropped), len(kept)))