Lint check and yaml enforcement for HitShape

Now that Health no longer provides a HitShape, actors with Health need at
least one HitShape trait.

OpenRA.Mods.Common/Lint/CheckHitShapes.cs

@@ -0,0 +1,38 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2017 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Lint
+{
+	class CheckHitShapes : ILintRulesPass
+	{
+		public void Run(Action<string> emitError, Action<string> emitWarning, Ruleset rules)
+		{
+			foreach (var actorInfo in rules.Actors)
+			{
+				if (actorInfo.Key.StartsWith("^", StringComparison.Ordinal))
+					continue;
+
+				var health = actorInfo.Value.TraitInfoOrDefault<HealthInfo>();
+				if (health == null)
+					continue;
+
+				var hitShapes = actorInfo.Value.TraitInfos<HitShapeInfo>();
+				if (!hitShapes.Any())
+					emitError("Actor type `{0}` has a Health trait but no HitShape trait!".F(actorInfo.Key));
+			}
+		}
+	}
+}