Add Buildable.BuildAtProduction.

This allows actors to be restricted to specific production structures.

OpenRA.Mods.RA/Buildable.cs

@@ -27,6 +27,9 @@ namespace OpenRA.Mods.RA
 		[Desc("Production queue(s) that can produce this.")]
 		public readonly string[] Queue = { };
 
+		[Desc("Override the production structure type (from the Production Produces list) that this unit should be built at.")]
+		public readonly string BuildAtProductionType = null;
+
 		[Desc("Disable production when there are more than this many of this actor on the battlefield. Set to 0 to disable.")]
 		public readonly int BuildLimit = 0;
 

OpenRA.Mods.RA/Player/ClassicProductionQueue.cs

@@ -76,9 +76,15 @@ namespace OpenRA.Mods.RA
 		protected override bool BuildUnit(string name)
 		{
 			// Find a production structure to build this actor
+			var info = self.World.Map.Rules.Actors[name];
+			var bi = info.Traits.GetOrDefault<BuildableInfo>();
+
+			// Some units may request a specific production type, which is ignored if the AllTech cheat is enabled
+			var type = bi == null || developerMode.AllTech ? Info.Type : bi.BuildAtProductionType ?? Info.Type;
+
 			var producers = self.World.ActorsWithTrait<Production>()
 				.Where(x => x.Actor.Owner == self.Owner
-					&& x.Trait.Info.Produces.Contains(Info.Type))
+					&& x.Trait.Info.Produces.Contains(type))
 					.OrderByDescending(x => x.Actor.IsPrimaryBuilding())
 					.ThenByDescending(x => x.Actor.ActorID);
 
@@ -90,7 +96,7 @@ namespace OpenRA.Mods.RA
 
 			foreach (var p in producers.Where(p => !p.Actor.IsDisabled()))
 			{
-				if (p.Trait.Produce(p.Actor, self.World.Map.Rules.Actors[name], Race))
+				if (p.Trait.Produce(p.Actor, info, Race))
 				{
 					FinishProduction();
 					return true;

OpenRA.Mods.RA/Player/ProductionQueue.cs

@@ -74,7 +74,7 @@ namespace OpenRA.Mods.RA
 		// Will change if the owner changes
 		PowerManager playerPower;
 		PlayerResources playerResources;
-		DeveloperMode developerMode;
+		protected DeveloperMode developerMode;
 
 		// A list of things we could possibly build
 		Dictionary<ActorInfo, ProductionState> produceable;