Template Part Shortcode

wp-template-part-shortcode.php

<?php

//Usage: [include template='template' part='part']
function template_part_shortcode($atts) {
    extract(shortcode_atts(array(
        'template' => 'templates/parts/page',
        'part' => null
    ), $atts));
    ob_start();
    get_template_part($template, $part);
    return ob_get_clean();
}
add_shortcode('include', 'template_part_shortcode');