tiff to pdf converter

Let me know how this goes...

/* 

Batch x2 File Sets to Multi-page PDF.jsx

tiff to pdf converter
https://community.adobe.com/t5/photoshop-ecosystem-discussions/tiff-to-pdf-converter/td-p/12540527

Stephen Marsh
22nd November 2021, Version 1.0
(Based on: Stack N Number of Docs to Layers.jsx)

Notes:
A minimum of 2 or more files per stack is required. The quantity of input files must be evenly divisible by the stack quantity.
This script assumes that input TIFF files from a single folder to be alpha/numeric sorting, such as:
File-01.jpg File-02.jpg etc, FileA1.tif FileA2.tif etc...

*/

#target photoshop

if (!app.documents.length) {

    try {

        // Save and disable dialogs
        var restoreDialogMode = app.displayDialogs;
        app.displayDialogs = DialogModes.NO;

        // Main script function
        (function () {

            // Select the input folder
            var inputFolder = Folder.selectDialog('Please select the input folder with TIFF files to process:');
            if (inputFolder === null) return;

            // Limit the file format input to TIFF
            var fileList = inputFolder.getFiles(/\.(tif|tiff)$/i);

            // Force alpha-numeric list sort in reverse order
            fileList.sort().reverse();

            // Set quantity
            var setQty = 2;

            // Validate that the file list is not empty
            var inputCount = fileList.length;
            var cancelScript1 = (inputCount === 0);
            if (cancelScript1 === true) {
                alert('Zero input files found, script cancelled!');
                return;
            }

            // Validate the input count vs. output count - Thanks to Kukurykus for the advice to test using % modulus
            var cancelScript2 = !(inputCount % setQty);
            alert(inputCount + ' input files combined into sets of ' + setQty + ' will produce ' + inputCount / setQty + ' output files.');
            if (cancelScript2 === false) {
                alert('Script cancelled as the quantity of input files are not evenly divisible by the set quantity!');
                return;
            }

            // Set the output folder
            var outputFolder = inputFolder;

            // Loop through and open the file sets
            while (fileList.length) {

                // Sets quantity
                for (var a = 0; a < setQty; a++) {
                    try {
                        app.open(fileList.pop());
                    } catch (e) { }

                    // Remove document ancestors metadata
                    deleteDocumentAncestorsMetadata();

                    function deleteDocumentAncestorsMetadata() {
                        // https://prepression.blogspot.com/2017/06/metadata-bloat-photoshopdocumentancestors.html
                        if (ExternalObject.AdobeXMPScript === undefined) ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
                        var xmp = new XMPMeta(activeDocument.xmpMetadata.rawData);
                        xmp.deleteProperty(XMPConst.NS_PHOTOSHOP, "DocumentAncestors");
                        app.activeDocument.xmpMetadata.rawData = xmp.serialize();
                    }
                }

                // Loop open files
                var openFiles = [];
                for (var a = 0; a < app.documents.length; a++) {
                    openFiles.push(app.documents[a].fullName);
                }

                // Doc name parts
                var docOne = app.documents[0].name.replace(/\.[^\.]+$/, '');
                var docTwo = app.documents[1].name.replace(/\.[^\.]+$/, '');

                // Save location and file name
                var saveFile = File(outputFolder + '/' + docOne + '_' + docTwo + '.pdf');

                // PDF options
                var pdfPresOptions = new PresentationOptions();
                pdfPresOptions.presentation = false;

                // Save the file pairs as a multi-page PDF
                app.makePDFPresentation(openFiles, saveFile, pdfPresOptions);

                // Close all open docs without saving
                while (app.documents.length) {
                    app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
                }

            }

            // Restore saved dialogs
            app.displayDialogs = restoreDialogMode;

            // End of script notifications
            app.beep();
            var outputList = outputFolder.getFiles(/\.pdf$/i);
            alert('Script completed!' + '\n' + outputList.length + ' multi-page PDF files saved to:' + '\n' + outputFolder.fsName);

            // Open the output folder in the Finder or Explorer
            outputFolder.execute();

        }());

    } catch (e) {
        // Restore saved dialogs
        app.displayDialogs = restoreDialogMode;
        alert("Oops! Something went wrong...");
    }

} else {
    alert('Batch x2 File Sets to Multi-page PDF:' + '\n' + 'Please close all open documents before running this script!');
}