Improve hands & pulling (#4389)

Content.Shared/Pulling/Systems/SharedPullerSystem.cs

@@ -0,0 +1,44 @@
+using Content.Shared.Alert;
+using Content.Shared.Physics.Pull;
+using Content.Shared.Pulling.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Pulling
+{
+    [UsedImplicitly]
+    public sealed class SharedPullerSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<SharedPullerComponent, PullStartedMessage>(PullerHandlePullStarted);
+            SubscribeLocalEvent<SharedPullerComponent, PullStoppedMessage>(PullerHandlePullStopped);
+        }
+
+        private static void PullerHandlePullStarted(
+            EntityUid uid,
+            SharedPullerComponent component,
+            PullStartedMessage args)
+        {
+            if (args.Puller.Owner.Uid != uid)
+                return;
+
+            if (component.Owner.TryGetComponent(out SharedAlertsComponent? alerts))
+                alerts.ShowAlert(AlertType.Pulling);
+        }
+
+        private static void PullerHandlePullStopped(
+            EntityUid uid,
+            SharedPullerComponent component,
+            PullStoppedMessage args)
+        {
+            if (args.Puller.Owner.Uid != uid)
+                return;
+
+            if (component.Owner.TryGetComponent(out SharedAlertsComponent? alerts))
+                alerts.ClearAlert(AlertType.Pulling);
+        }
+    }
+}