SP Support Q1

add_filter( 'excerpt_more', 'rv_filter_read_more_link' );
add_filter( 'get_the_excerpt', 'rv_do_excerpt_read_more_link' );
function rv_do_excerpt_read_more_link( $output ) {

    global $post;

    if ( $post->post_excerpt != '' ) {

        $output .= rv_filter_read_more_link();

    }

    return $output;

}

//* Function that returns the actual link
function rv_filter_read_more_link() {
    return sprintf( '<a href="%1$s" class="%2$s">%3$s</a>', get_permalink(), 'readmore', __( ' [Keep on reading!]' ) );
}