MainController.js

(function(){
  
  var app = angular.module("githubViewer");
  
  var MainController = function(
    $scope, $interval, $location){
    
    var decrementationCountdown = function(){
      $scope.countdown -= 1;
      if ($scope.countdown < 1){
        $scope.search($scope.username);
      }
    }
    
    var countdownInterval = null;
    var startCountdown = function(){
      countdownInterval = $interval(decrementationCountdown, 1000, $scope.countdown);
    }
    
    $scope.search = function(username){
      if (countdownInterval){
        $interval.cancel(countdownInterval);
        $scope.countdown = null;
      }
      
      $location.path("/user/" + username);
    }
    
    $scope.username = "angular";
    $scope.countdown = 5;
    startCountdown();
  };
  
  app.controller("MainController", MainController);

}())