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#!/usr/bin/env python3
"""Split a script-format .ep_ file (setboard/solution/id/go blocks, as
used by typhoon's `script` command) into two disjoint, shuffled halves
for a train/holdout threshold sweep.
Usage: split_ep.py <input.ep_> <out_a.ep_> <out_b.ep_> [--seed N]
Splits by whole position blocks (never mid-position), shuffled with a
fixed seed so the split is reproducible but not biased by the file's
original ordering (ECM.ep_ is not randomly ordered).
"""
import argparse
import random
import sys
def read_blocks(path):
"""Each block is the lines from one 'setboard' up to and including
the following 'go' line."""
blocks = []
current = []
with open(path) as f:
for line in f:
stripped = line.rstrip("\n")
if stripped.startswith("setboard") and current:
blocks.append(current)
current = []
current.append(stripped)
if current:
blocks.append(current)
return blocks
def main():
ap = argparse.ArgumentParser(description=__doc__)
ap.add_argument("input")
ap.add_argument("out_a")
ap.add_argument("out_b")
ap.add_argument("--seed", type=int, default=0)
args = ap.parse_args()
blocks = read_blocks(args.input)
if not blocks:
print(f"ERROR: no position blocks found in {args.input}", file=sys.stderr)
sys.exit(1)
rng = random.Random(args.seed)
order = list(range(len(blocks)))
rng.shuffle(order)
mid = len(order) // 2
half_a = sorted(order[:mid])
half_b = sorted(order[mid:])
with open(args.out_a, "w") as f:
for i in half_a:
f.write("\n".join(blocks[i]) + "\n")
with open(args.out_b, "w") as f:
for i in half_b:
f.write("\n".join(blocks[i]) + "\n")
print(f"{len(blocks)} positions in {args.input} -> "
f"{len(half_a)} in {args.out_a}, {len(half_b)} in {args.out_b} "
f"(seed={args.seed})")
if __name__ == "__main__":
main()
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