Javascript: Plugin base para jQuery

gistfile1

;(function( $, window, document, undefined) {
    var pluginName = 'ejemplo',
        defaults = {
            autoExec : true,
            autoExecMethod : 'auto',
            default : 'values',
        }

    // Código de inicialización acá
    methods = {
        'init' : function(options) {
            settings = $.extend(true, {}, defaults, options);
            this.each(function() {
                var $this = $(this),
                    data = $this.data(pluginName);

                if( data != undefined ) {
                    $.extend(settings, data);
                }

                $this.data(pluginName, {
                    "settings" : settings,
                });
            });
            return settings.autoExec ? methods[settings.autoExecMethod].call(this) : this;
        },

        'auto' : function() {
            return this.each(function() {
                var $target  = $(this),
                    settings = $target.data(pluginName).settings;

                console.log($target, settings);
            });
        },
    }

    $.fn[pluginName] = function(method) {
        if (typeof method == "object" || !method) {
            arg = [method];
            method = 'init';
        } else if (methods[method]) {
            arg = Array.prototype.slice.call(arguments, 1);
        } else {
            $.error('El método ' + method + ' invocado, no existe');
        }

        return methods[method].apply(this, arg);
    }

})(jQuery, window, document)