vue-wp/plugins/posts-to-posts/vendor/scribu/lib-posts-to-posts/shortcodes.php

<?php

class P2P_Shortcodes {

	static function init() {
		add_shortcode( 'p2p_connected', array( __CLASS__, 'connected' ) );
		add_shortcode( 'p2p_related', array( __CLASS__, 'related' ) );
	}

	static function connected( $attr ) {
		return self::get_list( $attr, 'get_connected' );
	}

	static function related( $attr ) {
		return self::get_list( $attr, 'get_related' );
	}

	private static function get_list( $attr, $method ) {
		global $post;

		$attr = shortcode_atts( array(
			'type' => '',
			'mode' => 'ul',
		), $attr );

		return P2P_List_Renderer::query_and_render( array(
			'ctype' => $attr['type'],
			'method' => $method,
			'item' => $post,
			'mode' => $attr['mode'],
			'context' => 'shortcode'
		) );
	}
}