The PHP code that constructs the actual widget code that pulls events from LWC

content-events-inline-list.php

<?php
/**
 * The template used for displaying an inline list of events. Used in side columns on landing page templates, mostly.
 *
 *
 * @package bsu2014
 */

if( get_field('show_event_list') ) :

  $extra_args = '';
  $transient_name = 'lwc2'; // LWCal + widget ID, will add options to this name below. "lwc" for "LiveWhale Calendar" because the max length on these is 64 characters.
  if( get_field( 'groups' ) != 'all' ) {
    $extra_args .= '/group/' . rawurlencode( trim( get_field( 'groups' ) ) );
    $transient_name .= '_group_'.str_replace(array(' ',',','&'),array('_','','_'),strtolower( trim( get_field( 'groups' ) ) ));
  } else {
    $transient_name .= '_allgroups';
  }

  if( get_field( 'max_events' ) ) {
    $extra_args .= '/max/' . trim( get_field( 'max_events' ) );
    $transient_name .= '_max' . trim( get_field( 'max_events' ) );
  }

  if( get_field( 'tags' ) ) {
    $events_tags = explode(',', get_field('tags'));
    $transient_name .= '_tags';
    foreach($events_tags as $tag){
      $extra_args .= '/tag/' . rawurlencode(trim($tag));
      $transient_name .= '_' . str_replace(array(' ',',','&'),array('_','','_'),trim($tag));
    }
  }

  $transient_name = substr( $transient_name, 0, 64 ); // transient names limited to 64 characters, so let's not go over.

  // Check the transient, and if it's expired/empty, refresh it:
  $events_transient = get_site_transient( $transient_name );

  if( empty( $events_transient ) ){
    $url='http://your-calendar.lwcal.com/live/widget/2'.$extra_args.'?external_widget=1';
    $response = wp_remote_retrieve_body(wp_remote_get( $url ));
    echo $response;
    set_site_transient( $transient_name, $response, 60*60*1 ); // 1 hour
  } else {
    echo $events_transient;
  }

endif; ?>