real-async-without-indent

main.js

var fs = require('fs');

function readFile (filename) {
  return function () {
    fs.readFile(filename, 'utf8', arguments.callee.next);
  }
}

function getData() {
  return function (err, data) {
    if (err) throw err;
    if (arguments.callee.next) {
      arguments.callee.next(data);
    }
  }
}

function putStrLn () {
  return function (data) {
      console.log(data);
      if (arguments.callee.next) {
        arguments.callee.next();
      }
  }
}

function wait (time) {
  return function () {
    setTimeout(arguments.callee.next, time);
  }
}

function param (val) {
  return function () {
    arguments.callee.next(val);
  }
}

var DoAsync = new Function();

DoAsync.prototype.run = function () {
  this.next();
}

DoAsync.prototype.__defineSetter__('do', function (val) {
  var origin = this;
  while (true) {
    if ('next' in origin) {
      origin = origin.next; 
    } else {
      origin.next = val;
      break;
    }
  }
  return null;
});

var main = new DoAsync();
main.do = new param('hello');
main.do = new putStrLn;
main.do = new wait(1000);
main.do = new param('world');
main.do = new putStrLn;
main.run();