Script save webp with active layer name

@Geppetto Luis  –  when I started you had not replied... I kept on adding extra stuff to my version as I was bored!

EDIT: Original version 1.0 updated, there is still one "flaw" that I would like to overcome... Can anyone help to improve the script please with a check for no layer selected?

/*
Save As Copy WebP via Google Plug-in with Active Layer Name.jsx
Stephen Marsh
Version 1.4, 28th September 2021

https://community.adobe.com/t5/photoshop-ecosystem-discussions/script-save-webp-with-active-layer-name/td-p/12399496
Script save webp with active layer name

ATTENTION:  * Script will silently fail if there is no active layer (To do: add an alert to warn if no layers are selected, easier said than done...)
            * Layer names will have all special characters removed in the save file (the original layer name will not be affected)
           
Using the optional extra plug-in from:
            https://helpx.adobe.com/photoshop/kb/support-webp-image-format.html
            https://github.com/webmproject/WebPShop
*/

#target photoshop

// Check for a previously saved sRGB 8 bpc active doc
if (app.documents.length && app.activeDocument.mode === DocumentMode.RGB && app.activeDocument.bitsPerChannel === BitsPerChannelType.EIGHT && app.activeDocument.colorProfileName.match(/\bsRGB\b/)) {
    // Save path
    var docPath = app.activeDocument.path.fsName;
    // Remove filename extension
    var docName = app.activeDocument.name.replace(/\.[^\.]+$/, '');
    // Remove all special characters & leading/trailing spaces from filename
    var lyrName = app.activeDocument.activeLayer.name.replace(/[^ a-z0-9-_]/gi, '').replace(/^ +| +$/g, '');
    // Active layer check, dupe layer/s to temp doc
    var idmake = stringIDToTypeID("make");
    var desc1510 = new ActionDescriptor();
    var idnull = stringIDToTypeID("null");
    var ref527 = new ActionReference();
    var iddocument = stringIDToTypeID("document");
    ref527.putClass(iddocument);
    desc1510.putReference(idnull, ref527);
    var idname = stringIDToTypeID("name");
    desc1510.putString(idname, """TempLayerCountDoc""");
    var idusing = stringIDToTypeID("using");
    var ref528 = new ActionReference();
    var idlayer = stringIDToTypeID("layer");
    var idordinal = stringIDToTypeID("ordinal");
    var idtargetEnum = stringIDToTypeID("targetEnum");
    ref528.putEnumerated(idlayer, idordinal, idtargetEnum);
    desc1510.putReference(idusing, ref528);
    var idversion = stringIDToTypeID("version");
    desc1510.putInteger(idversion, 5);
    executeAction(idmake, desc1510, DialogModes.NO);
    // Get the layer count of the temp doc
    var layerCount = app.activeDocument.layers.length;
    // Close the temp doc
    app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
    // Check for a visible single active layer
    if (layerCount === 1 && app.activeDocument.activeLayer.visible === true) {
        // Confirm overwrite
        if (docPath + "/" + lyrName + ".webp".exists) {
            // true = 'No' as default active button
            if (!confirm("File exists, overwrite: Yes or No?", true))
                // throw alert("Script cancelled!");
                throw null;
        }
        // Hide all layers except the active layer
        toggleActiveLayerVisibility(true);
        // Call the webp save function
        saveAsCopyWebP(75, 1, true, true, true, true, new File(docPath + "/" + lyrName + ".webp"), true, true);
        // Hide all layers except the active layer
        toggleActiveLayerVisibility(true);
        // EoS alert
        app.beep();
    } else {
        alert('Only 1 visible layer should be selected, script cancelled!');
    }
} else {
    alert('You must have an 8 bpc, sRGB document open!');
}

function saveAsCopyWebP(webpQuality, webpCompression, webpEXIF, webpXMP, webpICC, webpLoop, savePathAndName, saveAsCopy, lowerCase) {
    var c2t = function (s) {
        return app.charIDToTypeID(s);
    };
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var descriptor2 = new ActionDescriptor();
    // Quality: Integer range = 0 - 100
    /*
    | Quality value setting  -> | 0    ...    97 | 98         99 |    100   |
    |---------------------------|----------------|---------------|----------|
    | WebP encoding settings -> | Lossy, quality | Near-lossless | Lossless |
    |                           | 0    ...   100 | 60         80 |          |
    */
    descriptor2.putInteger(c2t("wrtq"), webpQuality);
    // Compression: Fastest = 0 | Default = 1 | Slowest = 2 
    descriptor2.putInteger(c2t("wrtc"), webpCompression);
    // Metadata - Keep EXIF: true | false
    descriptor2.putBoolean(c2t("wrte"), webpEXIF);
    // Metadata - Keep XMP: true | false
    descriptor2.putBoolean(c2t("wrtx"), webpXMP);
    // Metadata - Keep Color Profile: true | false
    descriptor2.putBoolean(c2t("wrtp"), webpICC);
    // Metadata: Loop forever
    descriptor2.putBoolean(c2t("wrtl"), webpLoop);
    descriptor.putObject(s2t("as"), s2t("Google WebPShop"), descriptor2);
    // Save path/name
    descriptor.putPath(s2t("in"), savePathAndName);
    descriptor.putInteger(s2t("documentID"), 219);
    // Save as copy: true | false
    descriptor.putBoolean(s2t("copy"), saveAsCopy);
    // Extension case
    descriptor.putBoolean(s2t("lowerCase"), lowerCase);
    descriptor.putEnumerated(s2t("saveStage"), s2t("saveStageType"), s2t("saveSucceeded"));
    // DialogModes.NO | DialogModes.ALL
    executeAction(s2t("save"), descriptor, DialogModes.NO);
}

function toggleActiveLayerVisibility(toggleOptionsPalette) {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var list = new ActionList();
    var reference = new ActionReference();
    reference.putEnumerated(s2t("layer"), s2t("ordinal"), s2t("targetEnum"));
    list.putReference(reference);
    descriptor.putList(s2t("null"), list);
    descriptor.putBoolean(s2t("toggleOptionsPalette"), toggleOptionsPalette);
    executeAction(s2t("show"), descriptor, DialogModes.NO);
}

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