Change UpdateRules to account for 20181215 hotfix

OpenRA.Mods.Common/UpdateRules/Rules/20181215/RemoveResourceExplodeModifier.cs

@@ -0,0 +1,49 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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.Collections.Generic;
+using System.Linq;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class RemoveResourceExplodeModifier : UpdateRule
+	{
+		public override string Name { get { return "Harvester and StoresResources traits no longer force Explodes.EmptyWeapon"; } }
+		public override string Description
+		{
+			get
+			{
+				return "The hardcoded behaviour forcing Explodes to use EmptyWeapon when the harvester/player has no\n" +
+					"resources has been removed. Affected actors are listed so that conditions may be manually defined.";
+			}
+		}
+
+		readonly List<string> locations = new List<string>();
+
+		public override IEnumerable<string> AfterUpdate(ModData modData)
+		{
+			if (locations.Any())
+				yield return "Review the following definitions and, if the actor uses Harvester or StoresResources,\n" +
+					"define a new Explodes trait with the previous EmptyWeapon, enabled by Harvester.EmptyCondition or\n" +
+					"GrantConditionOnPlayerResources.Condition (negated):\n" + UpdateUtils.FormatMessageList(locations);
+
+			locations.Clear();
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			if (actorNode.LastChildMatching("Explodes") != null)
+				locations.Add("{0} ({1})".F(actorNode.Key, actorNode.Location.Filename));
+
+			yield break;
+		}
+	}
+}