TwitterTimeline.scala

import java.net.{Authenticator, PasswordAuthentication}
import java.net.{URL, HttpURLConnection}
import scala.xml.XML
import java.text.SimpleDateFormat
import java.util.Locale

object TwitterTimeline {

  def main(arg:Array[String]){

    val url = if(arg.length == 2) {
      val (username, passwd) = (arg(0), arg(1))
      Authenticator.setDefault(
        new Authenticator {
          override def getPasswordAuthentication = {
            new PasswordAuthentication(username, passwd.toCharArray);
          }
        }
      )
      "http://twitter.com/statuses/friends_timeline.xml"
    }
    else {
      "http://twitter.com/statuses/public_timeline.xml"
    }

    val df = new SimpleDateFormat("EEE MMM dd HH:mm:ss +0000 yyyy", Locale.US)

    val interval = 60 * 1000

    def loop(_lastTime:Long) {
      var lastTime=_lastTime
      val urlConn = new URL(url).openConnection.asInstanceOf[HttpURLConnection]

      urlConn.connect();
      urlConn.getResponseCode

      for (s <- XML.load(urlConn.getInputStream) \ "status" reverse ;
           created_at = s \ "created_at" text ;
           time = df.parse(created_at).getTime if(time>lastTime)) {
          lastTime=time
          var (text, user_name) = (s \ "text" text, s \ "user" \ "name" text)
          println(created_at+" ["+user_name+"] "+text)
      }

      Thread.sleep(interval)

      loop(lastTime)
    }

    loop(0L)
  }
}