some progress on Repair

OpenRa.Game/Orders/RepairOrderGenerator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.GameRules;
+using OpenRa.Game.Traits;
+
+namespace OpenRa.Game.Orders
+{
+	class RepairOrderGenerator : IOrderGenerator
+	{
+		public IEnumerable<Order> Order(int2 xy, MouseInput mi)
+		{
+			if (!mi.IsFake && mi.Button == MouseButton.Right)
+			{
+				Game.controller.CancelInputMode();
+				yield break;
+			}
+
+			var loc = mi.Location + Game.viewport.Location;
+			var underCursor = Game.FindUnits(loc, loc)
+				.Where(a => a.Owner == Game.LocalPlayer
+					&& a.traits.Contains<Building>()
+					&& a.Info.Selectable).FirstOrDefault();
+
+			var building = underCursor != null ? underCursor.Info as BuildingInfo : null;
+
+			if (building == null || !building.Repairable)
+			{
+				yield return new Order("NoRepair", Game.LocalPlayer.PlayerActor, null, int2.Zero, null);
+				yield break;
+			}
+
+			yield return new Order("Repair", underCursor, null, int2.Zero, null);
+		}
+
+		public void Tick() {}
+
+		public void Render() {}
+	}
+}