Sample plugin

<!--element -->
<textarea id="content"></textarea>

<!-- plugin code -->
<script>
(function($R)
{
    $R.add('plugin', 'myplugin', {
        // construct
        init: function(app)
        {
            // define app
            this.app = app;

            // define services
            this.source = app.source;
        },
        // public
        start: function()
        {
            this._build();
        },
        stop: function()
        {

        },

        // private
        _build: function()
        {
            this.source.setCode('<p>I am the plugin. I am started and change the initial code of Redactor.</p>');
        }
    });
})(Redactor);
</script>

<!-- call -->
<script>
$R('#content', { plugins: ['myplugin'] });
</script>