#!/usr/bin/env bash
# Sparse-clone the GPLv3 SAGE 1.0 engine sources used as OpenRA3's reference.
#
# Usage: tools/fetch_reference.sh [destination]
set -euo pipefail

REPO="https://github.com/electronicarts/CnC_Generals_Zero_Hour.git"
DEST="${1:-reference/CnC_Generals_Zero_Hour}"

if [ -d "$DEST/.git" ]; then
    echo "reference already present at $DEST"
    exit 0
fi

mkdir -p "$(dirname "$DEST")"
git clone --depth 1 --filter=blob:none --sparse "$REPO" "$DEST"
git -C "$DEST" sparse-checkout set Generals GeneralsMD
echo "reference ready at $DEST"