Quick Save as Versions with Script?

Question

I'm looking to modify a script I found online but unfortunately I don't know enough Javascript to figure it out.
Here's the original code from this blog post:
#target photoshop;
if (app.documents.length > 0) {
var thedoc = app.activeDocument;
  var docName = thedoc.name;
if (docName.indexOf(".") != -1) {
  var basename = docName.match(/(.*)\.[^\.]+$/)[1]
} else {
  var basename = docName
  //getting the location, if unsaved save to desktop;
try {
  var docPath = thedoc.path
} catch (e) {
  var docPath = "~/Desktop"
var jpegOptions = new JPEGSaveOptions();
jpegOptions.quality = 9;
jpegOptions.embedColorProfile = true;
jpegOptions.matte = MatteType.NONE;
var filename = docPath + '/' + basename + "-" + getTime() + '.jpg';
  thedoc.saveAs((new File(filename)), jpegOptions, true);
function getTime(){
var currentTime = new Date();
  //Make single-digit mins show up as 6:01 and not 6:1
var minutes = currentTime.getMinutes();
if (minutes < 10) {
  minutes = "0" + minutes;
  var timeStamp = currentTime.getFullYear() + "-"
     + (currentTime.getMonth() + 1) + "-"
     + currentTime.getDate() + "-"
     + currentTime.getHours() + "."
     + minutes + "."
     + currentTime.getSeconds() + "."
     + currentTime.getMilliseconds();
return timeStamp;
What I'm trying to do is instead of saving with a timestamp, I'd rather have the script automatically detect the most recent version (eg: MyPicture_04.jpg) and save as the next logical increment (eg: MyPicture_05.jpg)
Anyone know how I'd be able to go about scripting that?
Thanks!

Answer 1

Hey, thanks for your help.
When I loaded your script it would revoke some of the naming of my original file, but with some tinkering I got it to work, but there are still some problems. One is it only saves one copy and then it'll just overwrite it...and the other is that when I'm creating the first save, my file comes out as 3LINE_V2_02a_NaN.jpg (bold is the part the script creates, the rest is my filename) and then after that it'll just overwrite it. Here's the script I have atm:
#target photoshop;
if (app.documents.length > 0) {
var thedoc = app.activeDocument;
  var docName = thedoc.name;
if (docName.indexOf(".") != -1) {
  var basename = docName.match(/(.*)\.[^\.]+$/)[1]
} else {
  var basename = docName
  if (docName.indexOf(".") != -1) {
   var basename = docName.match(/(.*)\.[^\.]+$/)[1]
  } else {
   var basename = docName
  var baseArray = basename.split("_")
  var imgNumStr = baseArray[baseArray.length-1]
  var replaceNum = Number (imgNumStr) + 1000000001
  var replaceStr = replaceNum.toString().substr (replaceNum.toString().length-imgNumStr.toString().length, imgNumStr.toString().length)
  var nameBeg = basename.substr(0,basename.length-replaceStr.length)
  if(Number (replaceStr)==0)
  {replaceStr = replaceNum.toString().substr (replaceNum.toString().length-imgNumStr.toString().length-1, imgNumStr.toString().length+1)}
  //getting the location, if unsaved save to desktop;
try {
  var docPath = thedoc.path
} catch (e) {
  var docPath = "~/Desktop"
var jpegOptions = new JPEGSaveOptions();
jpegOptions.quality = 10;
jpegOptions.embedColorProfile = true;
jpegOptions.matte = MatteType.NONE;
var filename = docPath + '/' + basename + "_" + replaceStr + '.jpg';
  thedoc.saveAs((new File(filename)), jpegOptions, true);
function getTime(){
var currentTime = new Date();
  //Make single-digit mins show up as 6:01 and not 6:1
var minutes = currentTime.getMinutes();
if (minutes < 10) {
  minutes = "0" + minutes;
  //Make single-digit hours show up as 06:01 and not 6:1
var hours = currentTime.getHours();
if (hours < 10) {
  hours = "0" + hours;
  var timeStamp = currentTime.getFullYear() + "_"
     + (currentTime.getMonth() + 1) + "_"
     + currentTime.getDate() + "_"
     + currentTime.getHours() + "_"
     + minutes + "_"
     + currentTime.getSeconds()
return timeStamp;