// Photoshop Script for Optimizing Images for the Web - Saves images as optimized jpeg
// Written by: Livingston Samuel
// Version 1.0.0
// Required Adobe Photoshop CS 2 and above

//Enable double clicking on Mac Finder & Windows Explorer
#target Photoshop

//Bring app to front
app.bringToFront()

// Backup the current Photoshop preferences
var startDisplayDialogs = app.displayDialogs,
	  startRulerUnits = app.preferences.rulerUnits;

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

// Get the Source folder
var inputFolder = Folder.selectDialog("Select the Source folder for Images to be optimized");

// Get the Destination folder
if (!!inputFolder) {
	var outputFolder = Folder.selectDialog("Select a folder to store the generated Optimized images");
}

if (!!inputFolder && !!outputFolder) {
	processImagesInFolder(inputFolder);
}

function processImagesInFolder(folder) { 
    var fileList = folder.getFiles();
     for (var i = 0; i < fileList.length; i++) {
		 var file = fileList[i]; 
		 if (file instanceof File && (file.name.match(/\.jpg$/i) || file.name.match(/\.png$/i) || file.name.match(/\.gif$/i)) && file.hidden == false) { // The fileList includes both folders and files so open only files
			 open(file);  // Open the file
			 
			 //Get Current File's Name
			 var imgfileName = file.name.split('.')
			 			 
			 //Set Destination file path
			 var saveFile = new File(outputFolder + "/" + imgfileName[0] + ".jpg"); 
			 
			 saveFile.remove(); // Remove any exisiting file with same name before saving
			 saveAsOptimizedJPEG(saveFile,60);  // Saving the file for web with 60% JPEG optimization
			 app.activeDocument.close(SaveOptions.DONOTSAVECHANGES); //Close the File
		} else if (file instanceof Folder) { 
			processFolder(file);  // Traverse subfolders
		} 
	} 
}

function saveAsOptimizedJPEG(saveFile,jpegQuality) { // Optimize Image for Web
	var sfwOptions = new ExportOptionsSaveForWeb(); 
	sfwOptions.format = SaveDocumentType.JPEG;
	sfwOptions.includeProfile = false; 
	sfwOptions.interlaced = 0; 
	sfwOptions.optimized = true; 
	sfwOptions.quality = jpegQuality; 
	app.activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions); 
} 


// Reset Photoshop preferences to original vlaues
app.displayDialogs = startDisplayDialogs;
app.preferences.rulerUnits = startRulerUnits;