Cassandra token range generator in Groovy

compute_tokens.groovy

println("Cassandra Token Range Generator \n")                           

int nodes = -1

if (args.length >= 1) {
  nodes = new Integer(args[0])
}
else {
  gets = {
    print it
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in))
    String input = br.readLine()
    return input
  }
  nodes = new Integer(gets('How many nodes are in your cluster? :'))
}

println "Token Ranges:"

for (int i in 0..nodes-1) {    
  // token_range = (i*(2**127))/nodes, but no no no, we give you...
  BigInteger token_range = new BigInteger(2).pow(127).divide(new BigInteger(nodes)).multiply(new BigInteger(i))
  println "node " + i + ": range: " + token_range
}