Step Experiment 4

/*
 * This demo program tries to rename 3 groups of files without overwriting any of the files in any other groups
 * The files are numbered quasi-consecutively tmp1, tmp2, tmp3, tmp11, tmp12, tmp13, etc.
 * I rename the files by adding 10 to the numeric part of the name
 * tmp1 cannot be renamed to tmp11 until the original tmp11 has been renamed to tmp21
 * 
 */

var Step = require('step');
var fs = require('fs');
var sys = require('sys');

var group1 = ["/tmp/tmp21", "/tmp/tmp22", "/tmp/tmp23"];
var group2 = ["/tmp/tmp11", "/tmp/tmp12", "/tmp/tmp13"];
var group3 = ["/tmp/tmp1", "/tmp/tmp2", "/tmp/tmp3"];

function newName(name){
  var newName = name.replace(/[0-9]+$/, function (num) {
    return parseInt(num) + 10;
  });
  sys.puts(newName);
  return newName;
};

function renameGroup(group, callback){
    group.forEach(
	function(file){
	    sys.puts(file);
	    Step(
		function(){
		    fs.stat(file, this);
		},
		function(err, stat) {
                    sys.puts(stat.ino);
		    fs.rename(file, newName(file), this);
		},
                callback()
	    );
	}
    );
};

Step(
	function (){
	    renameGroup(group1, this.group());
	},
	function (){
	    renameGroup(group2, this.group());
	},
	function (){
	    renameGroup(group3, this.group());
	}
);