#!/usr/bin/env bash
# Prints the ids of games whose folder changed, one per line.
#   changed-games.sh BASE_REF HEAD_REF   games changed between two commits
#   changed-games.sh all                 every game
#   changed-games.sh "palworld,ark-..."  just these
set -euo pipefail

if [ "${1:-}" = "all" ]; then
  ls games
  exit 0
fi
if [ $# -eq 1 ]; then
  tr ',' '\n' <<< "$1" | sed 's/ //g' | grep -v '^$' | while read -r id; do
    [ -d "games/$id" ] && echo "$id" || echo "unknown game: $id" >&2
  done
  exit 0
fi

git diff --name-only "$1" "$2" -- games/ \
  | cut -d/ -f2 | sort -u \
  | while read -r id; do
      # A deleted game has nothing to boot
      [ -f "games/$id/game.yaml" ] && echo "$id"
    done || true