Grunt task to find unused images (cleanup image folder)

unusedimages.js

// Find unused images
grunt.registerTask('unusedimages', function() {
    
    var arrImages = [],
        arrImageReference = [],
        destDir = '../htdocs/';

    // Populate image list on folder
    grunt.file.expand({
        filter: 'isFile',
        cwd: destDir //+ 'img/' // Set to search only on images folder for performance improvement
    }, ['**/*.{png,jpg,jpeg,gif,ico}']).forEach(function(file) { arrImages.push(file); });

    // Find images in source (html,js,css)
    grunt.file.expand({
        filter: 'isFile',
    }, [destDir + '**/*.{js,css,html}']).forEach(function(file) {
        var buffer = grunt.file.read(file);
        arrImages.forEach(function(asset) {
            if(buffer.search(asset) !== -1) {
                arrImageReference.push(asset);
            }
        });
    });

    // Output unused images
    var unused = grunt.util._.difference(arrImages, arrImageReference);
    console.log('Found '+ unused.length +' unused images:');
    unused.forEach(function(el) { console.log(el); });
    
});