simple stdin option selection in groovy

cliQuestion.groovy

void displayOptions(String name, List<String> options) {
    print("Select $name ::")
    options.eachWithIndex { String entry, int i ->
        print(" $entry [${i + 1}]${i + 1 == options.size() ? ": " : ","}")
    }
}

int readUserInput(List<String> options) {
    displayOptions(options)
    def input = ++new Scanner(System.in)
    if (input.isInteger() && input.toInteger() - 1 in options.indices) {
        return input.toInteger() - 1
    }
    println("\nPlease select a valid input !")
    return readUserInput(options)
}

def environements = [
        "dev", "tst", "preprod", "prod"
]

def input = readUserInput("env",environements)
println("User selected = (${environements[input]})")