// Photoshop CS script:  manyFilesIntoOne
//
// Given a subdirectory containing many JPG files, this script creates a new
// Photoshop document with many layers, each of which is from one of the
// subdirectory JPG files.  The size of the new doc is set to the size of the
// first image file read.
//
// To use this script, store it anywhere on your disk, then start Photoshop and
// use File->Scripts->Browse... to select and execute this script.  If you'd
// like this script to appear in the list of scripts at File->Scripts, just
// store this script in \Program Files\Adobe\Photoshop CS\Presets\Scripts
//
// References:
//   \Program Files\Adobe\Photoshop CS\Scripting Guide\Photoshop Scripting Guide.pdf
//   \Program Files\Adobe\Photoshop CS\Scripting Guide\JavaScript Reference Guide.pdf
//
//   (based on examples from the JavaScript Reference Guide; developed on Windows XP,
//   not tested on other platforms)
//
// Jim Elder, Ottawa, Oct 2004

// Save the current preferences
var startRulerUnits = app.preferences.rulerUnits;
var startTypeUnits = app.preferences.typeUnits;
var startDisplayDialogs = app.displayDialogs;

// Set Photoshop to use pixels and display no dialogs
app.preferences.rulerUnits = Units.PIXELS;
app.preferences.typeUnits = TypeUnits.PIXELS;
app.displayDialogs = DialogModes.NO;

// ask the user to identify the input subdirectory (folder)
var inputFilesFolder = Folder.selectDialog(
    "Select a folder that contains JPG images to be read into one " +
    "new Photoshop doc as layers",  Folder("~"));
    // the setting of default dir doesn't seem to work for other than ~

// Start the script debugger
// uncomment the line below to cause Photoshop to start its debugger at this point
// $.level = 1; debugger;

// see if the user gave us a folder
if (inputFilesFolder != null) {

  // close all the open documents
  while (app.documents.length)
    app.activeDocument.close();

  // get all the jpg files in the specified folder
  var fileList = inputFilesFolder.getFiles("*.png");

  // open one of them to get its size
  for (var i = 0; i < fileList.length; i++) {
    if (fileList[i] instanceof File) {
      var firstDoc = open(fileList[i]);
      break;

    }
  }

  // if there was a first doc...
  if (typeof(firstDoc) != 'undefined') {

    // create a new document to contain the merged images
    var mergedDoc = app.documents.add(firstDoc.width, firstDoc.height,
        firstDoc.resolution, "Merged", NewDocumentMode.RGB,
        DocumentFill.TRANSPARENT, 1);

    // close that first doc
    firstDoc.close(SaveOptions.DONOTSAVECHANGES);

    // open each file and add it as a layer to the 'merged' doc
    for (var i = 0; i < fileList.length; i++) {

      // open only files
      if (fileList[i] instanceof File) {
        open (fileList[i]);

        // save the document name for the layer name in the merged document
        var docName = app.activeDocument.name;

        // flatten the document so we get everything and then copy
        app.activeDocument.flatten();
        app.activeDocument.selection.selectAll();
        app.activeDocument.selection.copy();

        // close file; don't save anything we did
        app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

        // merge this image into the mergedDoc as a new layer
        mergedDoc.paste();
        mergedDoc.activeLayer.name = docName;

      }
    }

    // sort the layers by name
    for (var x = 0; x < app.activeDocument.layers.length; x++) {
      for (var y = 0; y < app.activeDocument.layers.length - 1 - x; y++) {
        var doc1 = app.activeDocument.layers[y].name;
        var doc2 = app.activeDocument.layers[y + 1].name;
        // compare layer names in a non-case sensitive way
        if (doc1.toUpperCase() > doc2.toUpperCase()) {
          app.activeDocument.layers[y].move(app.activeDocument.layers[y+1],
              ElementPlacement.PLACEAFTER);
        }
      }
    }
  }
}

// Reset the application preferences
app.preferences.rulerUnits = startRulerUnits;
app.preferences.typeUnits = startTypeUnits;
app.displayDialogs = startDisplayDialogs;