CUSTOM SCRIPT - Filename To Selected Layer...

@Carson Jones 

Thanks for sharing!

Unfortunately, one needs a more robust check for selected layers, as there's a quirk/bug with app.activeDocument.activeLayer in ExtendScript DOM, it will return the top layer even if no layers are selected.

Here is an example of your script updated using AM code, which does work as expected to check if no layer is selected:

if (app.documents.length > 0) {

    // selected layer check by jazz-y
    s2t = stringIDToTypeID;
    (r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayers'));
    r.putEnumerated(s2t("document"), s2t("ordinal"), s2t("targetEnum"));
    //

    if (executeActionGet(r).getList(p).count) {
        var docName = app.activeDocument.name;
        var nameNoExt = docName.replace(/\.[^\.]+$/, ''); // remove extension
        app.activeDocument.activeLayer.name = nameNoExt;

    } else {
        alert('No layer selected.');
    }
    
} else {
alert("No document open.");
}

@Carson Jones that's pretty slick. Thanks!