nextFrame.jsx

// Script by Vince Petaccio of PetRok Studios. | www.PetRokStudios.com

// Ensure a document is open
if ( documents.length > 0 )
{
    // Change dialog settings
	var originalDialogMode = app.displayDialogs;
	app.displayDialogs = DialogModes.ERROR;

    try 
    {
    	// Get the document
        var docRef = activeDocument;

        // Get the path for the document
        var filePath = docRef.path + '/';
    		
        // Get the filename of the document
        var fileNameNoExtension = docRef.name;
        
        // Split the filename at the dots
        fileNameNoExtension = fileNameNoExtension.split( "." );
        
        // If there's a dot, remove everything after the last dot
        if ( fileNameNoExtension.length > 1 ) {
            // Get the file type
            fileType = fileNameNoExtension[fileNameNoExtension.length-1];
            
            // Decrement the filename object by removing the last element (the stuff after the last .)
          	fileNameNoExtension.length--;
            
            // Reconnect everything BEFORE the first .
            fileNameNoExtension = fileNameNoExtension.join(".");
        }

        // Get the last five characters of the filename
        lastFive = fileNameNoExtension.slice(-5);
        allButFive = fileNameNoExtension.slice(0,-6);

        // Check whether the last five characters are digits
        newDoc = isNaN(parseInt(lastFive))
        
        // Create the needName switch
        needName = 1

        // If this is a new document, then add _00000 to the file name
        if (newDoc) {
            // Make the new file name
            newFileName = fileNameNoExtension + '_00000';
            allButFive = fileNameNoExtension;
            lastFive = '00000';
            
            // Do the saving. Check whether file_00000 exists first.
            needName = makeFile(fileType.toLowerCase(), docRef, newFileName)
            
        }
        // Otherwise, find the lowest number of the file name that does not exist, starting at the index of the file name's digits. Get the file number
        fileNumber = Number(lastFive);

        while (needName) {
            // Increment the file number
            fileNumber = fileNumber + 1;
        
            // Make the file number 4 digits with zeros
            switch ((fileNumber.toString()).length) {
                case 1:
                    newFileName = allButFive + '_0000' + fileNumber.toString();
                    break;
                case 2:
                    newFileName = allButFive + '_000' + fileNumber.toString();
                    break;
                case 3:
                    newFileName = allButFive + '_00' + fileNumber.toString();
                    break;
                case 4:
                    newFileName = allButFive + '_0' + fileNumber.toString();
                    break;
                case 5:
                    newFileName = allButFive + "_" + fileNumber.toString();
                    break;
            }
            // Do the saving
            needName = makeFile(fileType.toLowerCase(), docRef, newFileName)     
        }
    }
    catch(e)
    {
        // An error occured; restore dialog mode and display the error
        app.displayDialogs = originalDialogMode;
        throw e;
    }
}
else
{
    alert( "There's no file open! GET TO WORK!!!! :]");
}

// Function for saving the file
function makeFile(fileType, docRef, newFileName) {
    thisSameFile = docRef.path + '/' + newFileName + '.' + fileType;
    saveFile = new File(thisSameFile);
    if (saveFile.exists) {
        return 1;
    }
    switch (fileType) {
        case 'psd': // Photoshop file
            saveOpt = new PhotoshopSaveOptions();
            saveOpt.embedColorProfile = true;
            saveOpt.layers = true;
            break;
        case 'jpg': // JPEG file
            saveOpt = new JPEGSaveOptions();
            saveOpt.embedColorProfile = true;
            saveOpt.formatOptions = FormatOptions.STANDARDBASELINE;
            saveOpt.matte = MatteType.NONE;
            saveOpt.quality = 12;
            break;
        case 'png': // PNG file
            saveOpt = new PNGSaveOptions();
            saveOpt.compression = 0;
            break;
        case 'tif': // TIFF file
            saveOpt = new TiffSaveOptions();
            saveOpt.embedColorProfile = true;
            saveOpt.layers = false;
            saveOpt.transparency = true;
            break;
    }
    app.activeDocument.saveAs(saveFile,saveOpt,true,Extension.LOWERCASE);
    app.activeDocument.close(saveOpt.DONOTSAVECHANGES);
    open(saveFile);
    return 0;
 }