ip() {
  case "$1" in
    public)
      echo "$(curl -s https://api.ipify.org | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}')"
      ;;
    internal)
      ipconfig getifaddr $(route get default 2>/dev/null | awk '/interface: / {print $2}')
      ;;
    private)
      ifconfig | awk '/^(utun|ppp)/ {iface=$1} iface && $1 == "inet" && $2 ~ /^10\./ {print $2; exit}'
      ;;
    *)
      echo "Usage: ip [public|internal|private]"
      return 1
      ;;
  esac
}