#!/usr/bin/env bash
set -euo pipefail

repo=${1:-$PWD}
out=${LOLBENCH_PATCH_OUT:-/logs/artifacts/solution.patch}

mkdir -p "$(dirname "$out")"
cd "$repo"

baseline=/opt/lolbench/base_untracked.txt
current=$(mktemp)
new_files=$(mktemp)
trap 'rm -f "$current" "$new_files"' EXIT

git ls-files --others --exclude-standard | sort > "$current"
if [ -f "$baseline" ]; then
    comm -13 "$baseline" "$current" > "$new_files"
else
    cp "$current" "$new_files"
fi

if [ -s "$new_files" ]; then
    xargs -r git add -N -- < "$new_files"
fi

git diff --binary > "$out"

if [ ! -s "$out" ]; then
    echo "warning: wrote an empty solution patch to $out" >&2
else
    echo "wrote solution patch to $out"
fi