Batch Watermarking? with action, script, automation ...?

Uncomment the one section to remove the file extension. Set the formatting as you want- position, font, size

#target photoshop

testText();

function testText(){
if(documents.length > 0){
var originalDialogMode = app.displayDialogs;
app.displayDialogs = DialogModes.ERROR;
var originalRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.PIXELS;
try{
var docRef = activeDocument;
var LayerRef = docRef.artLayers.add();
LayerRef.kind = LayerKind.TEXT;
var TextRef = LayerRef.textItem;
var fileNameNoExtension = docRef.name;
//uncomment this section to remove file extension
//~ fileNameNoExtension = fileNameNoExtension.split('.');
//~ if(fileNameNoExtension.length > 1){
//~ fileNameNoExtension.length--;
//~ }
//~ fileNameNoExtension = fileNameNoExtension.join('.');
//

TextRef.contents = fileNameNoExtension;

//change this to the formatting you want to use
TextRef.position = new Array(425, 1025);
preferences.rulerUnits = Units.POINTS;
TextRef.size = 42;
TextRef.useAutoLeading = false;
TextRef.leading = 42;
TextRef.font = 'Calibri-Bold';
TextRef.justification = Justification.CENTER;
TextRef.autoKerning = AutoKernType.METRICS;
//

}
catch(e){
preferences.rulerUnits = originalRulerUnits;
app.displayDialogs = originalDialogMode;
return;
}
preferences.rulerUnits = originalRulerUnits;
app.displayDialogs = originalDialogMode;
}
else{
alert('You must have a document open to run this script.');
return;
}
}

Thank you!  With these tools, can one make the text in the watermark, the name of the photo?  Keep in mind that each photo will have a different file name.  So for a folder with 100 photos, I would need 100 different watermarks, with the text in each watermark, the same text as the file name. 

You can find out your answer here>> How to Watermark multiple images with different dimensions in Photoshop ?

Here is link to install Watermark CC from Adobe Add-ons https://exchange.adobe.com/addons/products/12780