try_wrapper.sh

  function try_wrapper() {
    WRAPPER_NAME="$1"
    FALLBACK="$2"
    shift 2

    WRAPPER="$WRAPPER_NAME"
    for ((I=0; I<32; I++)); do
      if [[ -x "$WRAPPER" ]]; then
        WRAPPER="$(readlink -e "$WRAPPER")"
        break
      fi

      WRAPPER="../$WRAPPER"
      if [[ "$(readlink -m "$WRAPPER")" == "/$WRAPPER_NAME" ]]; then
        # Can't find the wrapper script; fall back.
        WRAPPER="$FALLBACK"
        break
      fi
    done

    command "$WRAPPER" "$@"
  }

  # Use gradle wrapper if available.
  function gradle() {
    try_wrapper gradlew gradle "$@"
  }

  # Use Maven wrapper if available.
  function mvn() {
    try_wrapper mvnw mvn "$@"
  }