Add a 'ReplaceRequiresPower' update rule

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -595,6 +595,7 @@
     <Compile Include="UpdateRules\Rules\RemoveOutOfAmmo.cs" />
     <Compile Include="UpdateRules\Rules\RemovePlayerPaletteTileset.cs" />
     <Compile Include="UpdateRules\Rules\RenameWithTurreted.cs" />
+    <Compile Include="UpdateRules\Rules\ReplaceRequiresPower.cs" />
     <Compile Include="UpdateRules\Rules\ScaleModHealth.cs" />
     <Compile Include="UpdateRules\Rules\ScaleModHealthBy10.cs" />
     <Compile Include="UpdateRules\Rules\ScaleModHealthBy100.cs" />

OpenRA.Mods.Common/UpdateRules/Rules/ReplaceRequiresPower.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;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class ReplaceRequiresPower : UpdateRule
+	{
+		public override string Name { get { return "Replace 'RequiresPower' with 'GrantConditionOnPowerState'"; } }
+		public override string Description
+		{
+			get
+			{
+				return "'RequiresPower' has been replaced with 'GrantConditionOnPowerState' which\n" +
+					"toggles a condition depending on the power state.\nPossible PowerStates are: Normal " +
+					"(0 or positive), Low (negative but higher than\n50% of required power) and Critical (below Low).";
+			}
+		}
+
+		bool displayed;
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			var requiresPower = actorNode.LastChildMatching("RequiresPower");
+			if (requiresPower == null)
+				yield break;
+
+			requiresPower.RenameKey("GrantConditionOnPowerState@LOWPOWER", false);
+			requiresPower.AddNode("Condition", "lowpower");
+			requiresPower.AddNode("ValidPowerStates", "Low, Critical");
+
+			if (!displayed)
+			{
+				displayed = true;
+				yield return "'RequiresPower' was renamed to 'GrantConditionOnPowerState'.\n" +
+					"You might need to review your condition setup.";
+			}
+		}
+	}
+}

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -48,7 +48,8 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new ChangeBuildableArea(),
 				new ChangeCanPowerDown(),
 				new DropPauseAnimationWhenDisabled(),
-				new RemoveOutOfAmmo()
+				new RemoveOutOfAmmo(),
+				new ReplaceRequiresPower()
 			}),
 
 			new UpdatePath("release-20180218", "release-20180307", new UpdateRule[0]),