show event info in footer text line

includes/view/EventConfig_view.php

@@ -1,13 +1,48 @@
 <?php
 
+/**
+ * Converts event name and start+end date into a line of text.
+ */
+function EventConfig_info() {
+  $event_config = EventConfig();
+  if ($event_config === false) {
+    engelsystem_error("Unable to load event config.");
+  }
+  
+  // Event name, start+end date are set
+  if ($event_config['event_name'] != null && $event_config['event_start_date'] != null && $event_config['event_end_date'] != null) {
+    return sprintf(_("%s, from %s to %s"), $event_config['event_name'], date("Y-m-d", $event_config['event_start_date']), date("Y-m-d", $event_config['event_end_date']));
+  }
+  
+  // Event name, start date are set
+  if ($event_config['event_name'] != null && $event_config['event_start_date'] != null) {
+    return sprintf(_("%s, starting %s"), $event_config['event_name'], date("Y-m-d", $event_config['event_start_date']));
+  }
+  
+  // Event start+end date are set
+  if ($event_config['event_start_date'] != null && $event_config['event_end_date'] != null) {
+    return sprintf(_("Event from %s to %s"), date("Y-m-d", $event_config['event_start_date']), date("Y-m-d", $event_config['event_end_date']));
+  }
+  
+  // Only event name is set
+  if ($event_config['event_name'] != null) {
+    return sprintf($event_config['event_name']);
+  }
+  
+  return "";
+}
+
 /**
  * Render edit page for event config.
- * @param string $event_name The event name
- * @param string $event_welcome_msg The welcome message
- * @param date $buildup_start_date
- * @param date $event_start_date
- * @param date $event_end_date
- * @param date $teardown_end_date
+ *
+ * @param string $event_name
+ *          The event name
+ * @param string $event_welcome_msg
+ *          The welcome message
+ * @param date $buildup_start_date          
+ * @param date $event_start_date          
+ * @param date $event_end_date          
+ * @param date $teardown_end_date          
  */
 function EventConfig_edit_view($event_name, $event_welcome_msg, $buildup_start_date, $event_start_date, $event_end_date, $teardown_end_date) {
   return page_with_title(event_config_title(), [

public/index.php

@@ -164,7 +164,8 @@ echo template_render('../templates/layout.html', array(
     'header_toolbar' => header_toolbar(),
     'faq_url' => $faq_url,
     'contact_email' => $contact_email,
-    'locale' => locale() 
+    'locale' => locale(),
+    'event_info' => EventConfig_info() . '<br />'
 ));
 
 ?>

templates/layout.html

@@ -29,6 +29,7 @@
       <div class="col-md-12">
         <hr />
         <div class="text-center footer" style="margin-bottom: 10px;">
+          %event_info%
           <a href="%faq_url%">FAQ</a> · <a href="%contact_email%"><span class="glyphicon glyphicon-envelope"></span> Contact</a> · <a href="https://github.com/engelsystem/engelsystem/issues">Bugs / Features</a> · <a href="https://github.com/engelsystem/engelsystem/">Development
             Platform</a> · <a href="?p=credits">Credits</a>
         </div>