Listen&Eject: Broadcaster

import std.stdio;
import std.socket;
import std.conv;
import std.process;
import core.thread;

void main(string[] argv) {
  if (argv.length == 2) { argv ~= "4455"; }
  if (argv.length != 3) {
    writefln("Usage: %s <server host> <port>", argv[0]);
    return;
  }
  ushort port = parse!ushort(argv[2]);
  auto addr = new InternetAddress(argv[1], port);
  auto s = new UdpSocket();
  writefln("Sending datagrams to %s:%s", addr.toAddrString, port);

  while (true){
    write("\b",progressChar);; stdout.flush;
    s.sendTo(null, addr);
    core.thread.Thread.sleep(dur!("seconds")(3));
  }
}

char progressChar() {
  static char[] chars = [ '-', '\\', '|', '/', ];
  static int index = 0;
  if (index == chars.length) index = 0;
  return chars[index++];
}