choose build palette on select production building

OpenRa.Game/Chrome.cs

@@ -1191,5 +1191,13 @@ namespace OpenRa
 				renderer.DrawText(sp.Info.LongDesc.Replace("\\n", "\n"), pos, Color.White);
 			}
 		}
+
+		public void SetCurrentTab(string produces)
+		{
+			if (!paletteOpen)
+				paletteAnimating = true;
+			paletteOpen = true;
+			currentTab = produces;
+		}
 	}
 }

OpenRa.Game/OpenRa.Game.csproj

@@ -118,6 +118,7 @@
     <Compile Include="Support\OpenAlInterop.cs" />
     <Compile Include="Support\PerfHistory.cs" />
     <Compile Include="Sync.cs" />
+    <Compile Include="Traits\ChoosePaletteOnSelect.cs" />
     <Compile Include="Traits\CrateSpawner.cs" />
     <Compile Include="Traits\OreGrowth.cs" />
     <Compile Include="Traits\OreRefinery.cs" />

OpenRa.Game/Traits/ChoosePaletteOnSelect.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Traits
+{
+	class ChoosePaletteOnSelectInfo : StatelessTraitInfo<ChoosePaletteOnSelect> { }
+
+	class ChoosePaletteOnSelect : INotifySelection
+	{
+		public void SelectionChanged()
+		{
+			var firstItem = Game.controller.selection.Actors.FirstOrDefault(
+				a => a.World.LocalPlayer == a.Owner && a.traits.Contains<Production>());
+
+			if (firstItem == null)
+				return;
+
+			var produces = firstItem.Info.Traits.Get<ProductionInfo>().Produces.FirstOrDefault();
+			if (produces == null)
+				return;
+
+			Game.chrome.SetCurrentTab(produces);
+		}
+	}
+}

mods/ra/rules.yaml

@@ -71,6 +71,7 @@ World:
 	LightPaletteRotator:
 	BuildingInfluence:
 	UnitInfluence:
+	ChoosePaletteOnSelect:
 	PaletteFromFile@terrain_temperat:
 		Name: terrain
 		Filename: temperat.pal