/wp-content/plugins/events-manager/em-ical.php

<?php

	/**

	 * generates an ical feed on init if url is correct

	 */

	function em_ical( $regenerate = false ){

		//check if this is a calendar request for all events

		$cal_file_request = preg_match('/events.ics$/', $_SERVER['REQUEST_URI']); //are we askig for the ics file directly but doesn't exist?

		if ( $cal_file_request || $_SERVER['REQUEST_URI'] == '/?ical=1' || $regenerate ) {

			$calendar = em_ical_events();

			//let's create a cache file

			/*

			if( get_option('dbem_regenerate_ical') || !file_exists(ABSPATH . "/events.ics") ){

				$file = fopen( ABSPATH . "/events.ics", 'w');

				if($file){

					fwrite($file, $calendar, strlen($calendar));

					fclose($file);

					update_option('dbem_regenerate_ical',false);

				}

			}

			*/

			echo $calendar;	

			die ();

		}

	}

	add_action ( 'init', 'em_ical' );

	

	function em_ical_event(){

		global $wpdb, $wp_query;

		//add endpoints to events

		if( !empty($wp_query) && $wp_query->get(EM_POST_TYPE_EVENT) && $wp_query->get('ical') ){

			$event_id = $wpdb->get_var('SELECT event_id FROM '.EM_EVENTS_TABLE." WHERE event_slug='".$wp_query->get(EM_POST_TYPE_EVENT)."' AND event_status=1 LIMIT 1");

			if( !empty($event_id) ){

				global $EM_Event;

				$EM_Event = em_get_event($event_id);

				ob_start();

				em_locate_template('templates/ical-event.php', true);

				echo preg_replace("/([^\r])\n/", "$1\r\n", ob_get_clean());

				exit();

			}

		}

	}

	add_action ( 'parse_query', 'em_ical_event' );

	

	

	function em_ical_events(){

		ob_start();

		em_locate_template('templates/ical.php', true);

		return preg_replace("/([^\r])\n/", "$1\r\n", ob_get_clean());//get the contents to output and clean crlf issues

	}

	

	function em_update_ical($result){

		update_option('dbem_regenerate_ical',true);

		return $result;

	}

	add_filter('em_event_save','em_update_ical', 1, 1);

?>