show message when there are no visible messages (fixes #67)

web/logbot.js

@@ -485,6 +485,16 @@ $(function() {
             }
         });
 
+    // no-event messages
+
+    $(document).on('setting:hide-b', function(e, enabled) {
+        if (enabled) {
+            $('#no-visible-events').show();
+        } else {
+            $('#no-visible-events').hide();
+        }
+    });
+
     // settings dialog
 
     function toggle_setting($setting, name) {

web/templates/channel.html.ep

@@ -22,6 +22,11 @@
     No messages for <%= time_to_datestr($date->epoch) %>.
   </div>
 % }
+% if ($event_count - $bot_event_count == 0) {
+  <div class="notification no-events default-display-none" id="no-visible-events">
+    No visible messages for <%= time_to_datestr($date->epoch) %>.
+  </div>
+% }
 
 </div>
 % end