PhotoShop Script to check the consistency of fonts in a document

Check Fonts.jsx

/**
 * PhotoShop Script to check the consistency of fonts in a document
 * @author Dave Stewart
 * @date 23 May 2013
 * @url twitter.com/dave_stewart
 */
function checkFonts(fontName)
{
	// functions
		function checkSet(set)
		{
			for(var j = 0; j < set.layers.length; j++)
			{
				layer = set.layers[j];
				if(layer.kind == LayerKind.TEXT)
				{
					count ++;
					font = layer.textItem.font;
					if(font.indexOf(fontName) == -1)
					{
						str += (set instanceof Document ? '' : set.name + '/') + layer.name + ' : ' + font + '\n';
					}
				}
			}
		}
	
	// variables
		var str = '';
		var set, layer, font;
		var sets = app.activeDocument.layerSets;
		var count = 0;

	// check layers
		checkSet(app.activeDocument);
		
	// check sets
		for(var i = 0; i < sets.length; i++)
		{
			checkSet(sets[i]);
		}

	// alert
		if(count == 0)
		{
			alert('No text layers in document');
		}
		else if(str)
		{
			alert('The following layers are using a font other than ' + fontName + ':\n\n' + str);
		}
		else
		{
			alert('All fonts OK!');
		}
				
	return str;
}

var fontName = prompt('Check all text layers for the usage of font:', 'Lato');
if(fontName)
{
	checkFonts(fontName);
}