Adds a component for ghosting on move. (#3090)

* Adds a component for ghosting on move.
Adds a dummy input mover for IRelayMoveInput to work.

* Add IGhostOnMove

* Fix tests.

Content.Server/GameObjects/Components/Body/Behavior/BrainBehavior.cs

@@ -1,7 +1,9 @@
 #nullable enable
 using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.GameObjects.Components.Observer;
 using Content.Shared.GameObjects.Components.Body;
 using Content.Shared.GameObjects.Components.Body.Part;
+using Content.Shared.GameObjects.Components.Movement;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Interfaces.GameObjects;
 
@@ -56,6 +58,13 @@ namespace Content.Server.GameObjects.Components.Body.Behavior
             newEntity.EnsureComponent<MindComponent>();
             var oldMind = oldEntity.EnsureComponent<MindComponent>();
 
+            if (!newEntity.HasComponent<IGhostOnMove>())
+                newEntity.AddComponent<GhostOnMoveComponent>();
+
+            // TODO: This is an awful solution.
+            if (!newEntity.HasComponent<IMoverComponent>())
+                newEntity.AddComponent<SharedDummyInputMoverComponent>();
+
             oldMind.Mind?.TransferTo(newEntity);
         }
     }

Content.Server/GameObjects/Components/Body/BodyComponent.cs

@@ -1,6 +1,7 @@
 #nullable enable
 using System;
 using Content.Server.Commands.Observer;
+using Content.Server.GameObjects.Components.Observer;
 using Content.Shared.Audio;
 using Content.Shared.GameObjects.Components.Body;
 using Content.Shared.GameObjects.Components.Body.Part;
@@ -25,7 +26,8 @@ namespace Content.Server.GameObjects.Components.Body
     [RegisterComponent]
     [ComponentReference(typeof(SharedBodyComponent))]
     [ComponentReference(typeof(IBody))]
-    public class BodyComponent : SharedBodyComponent, IRelayMoveInput
+    [ComponentReference(typeof(IGhostOnMove))]
+    public class BodyComponent : SharedBodyComponent, IRelayMoveInput, IGhostOnMove
     {
         private Container _partContainer = default!;
 

Content.Server/GameObjects/Components/Observer/GhostOnMoveComponent.cs

@@ -0,0 +1,41 @@
+#nullable enable
+using System;
+using Content.Server.Commands.Observer;
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.GameObjects.Components.Movement;
+using Content.Shared.GameObjects.Components.Movement;
+using Robust.Server.Console;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Players;
+using Robust.Shared.Serialization;
+
+namespace Content.Server.GameObjects.Components.Observer
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(IGhostOnMove))]
+    public class GhostOnMoveComponent : Component, IRelayMoveInput, IGhostOnMove
+    {
+        public override string Name => "GhostOnMove";
+
+        public bool CanReturn { get; set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(this, x => x.CanReturn, "canReturn", true);
+        }
+
+        void IRelayMoveInput.MoveInputPressed(ICommonSession session)
+        {
+            // Let's not ghost if our mind is visiting...
+            if (Owner.HasComponent<VisitingMindComponent>()) return;
+            if (!Owner.TryGetComponent(out MindComponent? mind) || !mind.HasMind || mind.Mind!.IsVisitingEntity) return;
+
+            var host = IoCManager.Resolve<IServerConsoleHost>();
+            new Ghost().Execute(new ConsoleShell(host, session), string.Empty, Array.Empty<string>());
+        }
+    }
+}

Content.Server/GameObjects/Components/Observer/IGhostOnMove.cs

@@ -0,0 +1,8 @@
+using Content.Shared.GameObjects.Components.Movement;
+
+namespace Content.Server.GameObjects.Components.Observer
+{
+    public interface IGhostOnMove
+    {
+    }
+}

Content.Shared/GameObjects/Components/Movement/SharedDummyInputMoverComponent.cs

@@ -0,0 +1,29 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Shared.GameObjects.Components.Movement
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(IMoverComponent))]
+    public class SharedDummyInputMoverComponent : Component, IMoverComponent
+    {
+        public override string Name => "DummyInputMover";
+        public float CurrentWalkSpeed => 0f;
+        public float CurrentSprintSpeed => 0f;
+        public float CurrentPushSpeed => 0f;
+        public float GrabRange => 0f;
+        public bool Sprinting => false;
+        public (Vector2 walking, Vector2 sprinting) VelocityDir => (Vector2.Zero, Vector2.Zero);
+        public EntityCoordinates LastPosition { get; set; }
+        public float StepSoundDistance { get; set; }
+
+        public void SetVelocityDirection(Direction direction, ushort subTick, bool enabled)
+        {
+        }
+
+        public void SetSprinting(ushort subTick, bool walking)
+        {
+        }
+    }
+}