Backup local Stardew Valley save files

backup-stardew.sh

#USER=username
#PLATFORM=linux

print_help() {
    echo "Edit USER and PLATFORM variables in this file:"
    echo "$0"
    echo
    echo "USER should be your system username"
    echo "PLATFORM must be 'linux' or 'wsl'"
    exit
}

if [ -z "$USER" ] || [ -z "$PLATFORM" ]; then
    print_help
fi

if [ "$PLATFORM" == "linux" ]; then
    BACKUP_DIR=/home/"$USER"/StardewBackups/
    SAVES_DIR=/home/"$USER"/.config/StardewValley/Saves/*
elif [ "$PLATFORM" == "wsl" ]; then
    BACKUP_DIR=/mnt/c/Users/"$USER"/StardewBackups/
    SAVES_DIR=/mnt/c/Users/"$USER"/AppData/Roaming/StardewValley/Saves/*
else
    echo "Invalid platform: must be in {linux,wsl}"
    exit
fi

ls "$BACKUP_DIR" > /dev/null 2>&1
if [ $? != 0 ]; then
    mkdir "$BACKUP_DIR" > /dev/null 2>&1
    if [ $? != 0 ]; then
        echo "Failed to create backup directory"
        exit
    fi
fi

dir="$BACKUP_DIR"$(date +"%Y-%m-%d")
newdir="$dir"
iter=0
ls "$dir" > /dev/null 2>&1
while [ $? == 0 ]; do
    let iter=$iter+1
    newdir="$dir"-$iter
    ls "$newdir" > /dev/null 2>&1
done
mkdir "$newdir"
cp -r $SAVES_DIR "$newdir"