/*
 * 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 = "";
    var num = parseInt(name.slice(-2));
    if(isNaN(num)){
	num = parseInt(name.slice(-1));
	num = num + 10;
	newName = name.slice(0, -1) + num;
    } else {
	num = num + 10;
	newName = name.slice(0, -2) + num;
    }

    sys.puts(newName);
    return newName;
};

function renameGroup(groupNames, group){
    groupNames.forEach(
	function(file){
	    sys.puts(file);
	    fs.rename(file, newName(file), group());
	}
    );
};

//this actually does work but as you can see there is lots of boilerplate
function renameFiles(){
    Step(
	function (){
	    var group = this.group();
	    renameGroup(group1, group);
	},
	function (){
	    var group = this.group();
	    renameGroup(group2, group);
	},
	function (){
	    var group = this.group();
	    renameGroup(group3, group);
	}
    );
};

renameFiles();