Pow3r: stage 1 (#4208)

Co-authored-by: 20kdc <asdd2808@gmail.com>

Content.Server/Power/Nodes/CableTerminalPortNode.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using Content.Server.NodeContainer.Nodes;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Power.Nodes
+{
+    [DataDefinition]
+    public class CableTerminalPortNode : Node
+    {
+        public override IEnumerable<Node> GetReachableNodes()
+        {
+            var compMgr = IoCManager.Resolve<IComponentManager>();
+            var grid = IoCManager.Resolve<IMapManager>().GetGrid(Owner.Transform.GridID);
+            var gridIndex = grid.TileIndicesFor(Owner.Transform.Coordinates);
+
+            var nodes = NodeHelpers.GetCardinalNeighborNodes(compMgr, grid, gridIndex, includeSameTile: false);
+            foreach (var (_, node) in nodes)
+            {
+                if (node is CableTerminalNode)
+                    yield return node;
+            }
+        }
+    }
+}