one page theme shortcode

function pagecontent_shortcode($atts, $content = null) {
        extract(shortcode_atts(array(
            'pslug' => '',
        ), $atts));
            $q = new WP_Query(
                'pagename='.$pslug.''
            );
                $list .= '
    <section id="'.$pslug.'">
        <div class="container">
                ';
                    while($q->have_posts()) : $q->the_post();
                        $idd = get_the_ID();
                        $pagesubtitle = get_post_meta($idd, 'pagesubtitle', true);

                        $list .= '
                     <div class="row">
                           <div class="col-lg-12 text-center">
                              <h2 class="section-heading">'.get_the_title().'</h2>
                                 <h3 class="section-subheading text-muted">'.$pagesubtitle.'</h3>

                            </div>
                    </div>

                        <p>'.get_the_content().'</p>
                        ';

                    endwhile;
                $list .= '
        </div>
    </section>
                ';
            wp_reset_query();
        return $list;
}
add_shortcode('pagepost', 'pagecontent_shortcode');