pull-shortcode-from-main-site.php

<?php
/*
* Plugin Name: Krogsgard enable main site forms and audio
* Plugin URI: http://infomedia.com/
* Description: enables a user to use audio and form shortcodes from the main site in sub sites with a wrapper shortcode
* Version: 0.1
* Author: Brian Krogsgard
* Author URI: http://krogsgard.com/
* Network: true
*/


/* 
 * you need to active the 'blubrry powerpress' plugin and 'audio file manager' plugin for the audio shortcode, and gravity forms for the form shortcode
 * they are already installed, just need activating on each subsite you want to use these wrapper shortcodes
 *
 * This plugin goes in the mu-plugins folder
 * theoretically, this could be abstracted to any shortcode
 */

add_shortcode( 'krogs-main-form', 'krogs_get_main_site_form' );
add_shortcode( 'krogs-main-audio', 'krogs_get_main_site_audio' );
  
/*
 * @requires Gravity form activation in main site
 * 
 * Can add other attributes if necessary
 */

function krogs_get_main_site_form( $atts ) {
     extract(shortcode_atts(array(
	      'id' => 1,
	      'title' => true
     ), $atts));

     $maincontent = '';
     
     if ( ! is_main_site() ) {
	     
		global $switched;
		
		switch_to_blog(1);
		
		$maincontent = do_shortcode('[gravityform id="' . $id .'" title="' . $title . '"]');
	
		restore_current_blog();	
		
	}
	
	return $maincontent;		
	
}

/*
 * @requires Blubrry powerpress and our Audio CPT plugin to be active
 * 
 * Can add other attributes if necessary
 */
function krogs_get_main_site_audio( $atts ) {
     extract(shortcode_atts(array(
	      'category' => false,
	      'posts_per_page' => 10,
     ), $atts));

     $maincontent = '';
     
     if ( ! is_main_site() ) {
         
		global $switched;
		
		switch_to_blog(1);
				
		$maincontent = do_shortcode('[audio-list posts_per_page="' . $posts_per_page . '" audio_category="' . $category . '"]');
		
		restore_current_blog();
	
	}
	
	return $maincontent;	
	
}