bg3version

#!/usr/bin/env bash
die() {
	echo "${1}"
	exit 1
}

activate() {
	local version="${1:-current}"
	check "${BG3_INSTALL_DIR}" "bg3.${version}"

	echo "Removing current game folder …"
	sudo btrfs sub del "${BG3_INSTALL_DIR}"
	echo "Creating snapshot of \"bg3.${version}\" …"
	sudo btrfs sub snap "bg3.${version}" "${BG3_INSTALL_DIR}"
}

check() {
	local dir
	for dir in "$@"; do
		if ! [ -d "${dir}" ] || [ $(stat --format=%i "${dir}") -ne 256 ] || [ $(stat -f --format=%T "${dir}") != "btrfs" ]; then
			die "Folder \"${dir}\" is not a BTRFS snapshot, aborting …"
		fi
	done
}

create() {
	check "${BG3_INSTALL_DIR}"
	local version="${1}"

	if [ -z "${version}" ]; then
		die "No VERSION given, aborting …"
	fi

	echo "Creating snapshot \"bg3.${version}\" …"
	sudo btrfs sub snap "${BG3_INSTALL_DIR}" "bg3.${version}"
}

delete() {
	local version=$1

	if [ -z "${version}" ]; then
		die "No VERSION given, aborting …"
	fi

	check "bg3.${version}"

	echo "Removing snapshot \"bg3.${version}\" …"
	sudo btrfs sub del "bg3.${version}"
}

list() {
	ls | tr " " "\n" | grep "bg3."
}

usage() {
	cat <<EOF
Usage: $(basename $0) [OPTION] VERSION
Options:
  --activate          Use this snapshot as the game folder.
  --create, snap      Create a new VERSION snapshot.
  --delete            Delete the snapshot for VERSION.
  --help              Print this text.
  --list              Instead of changing to VERSION, list all available versions.
  --version           Switch to VERSION.

Empty argument list is equivalent to "--list". A single argument is equivalent to
"--activate <argument>".
EOF
}

source "$(dirname $(realpath $0))/util/folders.sh"

CONFIG_FILE="${CONFIG_FILE:-${XDG_CONFIG_HOME:-$HOME/.config}/bg3-mod-profiles/config}"
if [ -f "${CONFIG_FILE}" ]; then
	while read line; do declare "$line"; done <"${CONFIG_FILE}"
fi

if [ -z "${BG3_INSTALL_DIR}" ]; then
	_library="$(getBg3Library)"
	[ $? -eq 1 ] && echo "Steam library folder for Baldur’s Gate 3 not found! Exiting …" && exit 1
	BG3_INSTALL_DIR="${_library}/steamapps/common/Baldurs Gate 3"
fi

cd "$(dirname "${BG3_INSTALL_DIR}")"

case $1 in
--create | --snap)
	create "$2"
	;;
--delete)
	delete "$2"
	;;
--help)
	usage
	;;
--list)
	list
	;;
--version)
	activate "$2"
	;;
"")
	list
	;;
*)
	activate "$1"
	;;
esac