Add popup message extension for players in range except for the source (#1962)

Content.Server/Utility/NotifyExtensions.cs

@@ -0,0 +1,37 @@
+using Content.Shared.Interfaces;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Server.Utility
+{
+    public static class NotifyExtensions
+    {
+        /// <summary>
+        ///     Pops up a message for every player around <see cref="source"/> to see,
+        ///     except for <see cref="source"/> itself.
+        /// </summary>
+        /// <param name="source">The entity on which to popup the message.</param>
+        /// <param name="message">The message to show.</param>
+        /// <param name="range">
+        ///     The range in which to search for players, defaulting to one screen.
+        /// </param>
+        public static void PopupMessageOtherClients(this IEntity source, string message, int range = 15)
+        {
+            var playerManager = IoCManager.Resolve<IPlayerManager>();
+            var viewers = playerManager.GetPlayersInRange(source.Transform.GridPosition, range);
+
+            foreach (var viewer in viewers)
+            {
+                var viewerEntity = viewer.AttachedEntity;
+
+                if (viewerEntity == null || source == viewerEntity)
+                {
+                    continue;
+                }
+
+                source.PopupMessage(viewer.AttachedEntity, message);
+            }
+        }
+    }
+}