Shortlink All the Things

shortlink-all-the-things.php

<?php
/*
Plugin Name: Shortlink All the Things
Description: Enables shortlinks for all custom post types.
Author: Stephanie Leary
Version: 1.0
Author URI: http://stephanieleary.com
*/

function shortlink_all_post_types($id = 0, $context = 'post', $allow_slugs = true) {
	global $wp_query;
	$post_id = 0;
	if ( 'query' == $context && is_singular() && !is_search() && !is_404() ) { 
		$post_id = $wp_query->get_queried_object_id();
	} elseif ( 'post' == $context ) {
		$post = get_post($id);
		$post_id = $post->ID;
	}

	$options = get_option('us2011_theme');
	$shortlink = '';
	$structure = get_option('permalink_structure');
	if (!empty($options['shortlink_url']))
		$domain = $options['shortlink_url'];
	else
		$domain = site_url();
	// Return p= link for all public post types.
	if ( !empty($post_id) && !empty($structure) ) {
		$post = get_post($post_id);
		$post_type = get_post_type_object( $post->post_type );
		if ( $post_type->public ) {
			$shortlink = esc_url(trailingslashit($domain).'?p='.$post->ID);
		}
	}

	return apply_filters('get_shortlink', $shortlink, $id, $context, $allow_slugs);
}
add_filter( 'pre_get_shortlink', 'shortlink_all_post_types');