Start a tastudio lua library

BizHawk.Client.EmuHawk/BizHawk.Client.EmuHawk.csproj

@@ -702,6 +702,7 @@
     <Compile Include="tools\Lua\Libraries\EmuLuaLibrary.Gui.cs" />
     <Compile Include="tools\Lua\Libraries\EmuLuaLibrary.Input.cs" />
     <Compile Include="tools\Lua\Libraries\EmuLuaLibrary.Savestate.cs" />
+    <Compile Include="tools\Lua\Libraries\EmuLuaLibrary.Tastudio.cs" />
     <Compile Include="tools\Lua\LuaCheckbox.cs">
       <SubType>Component</SubType>
     </Compile>

BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs

@@ -0,0 +1,29 @@
+using System;
+using System.ComponentModel;
+
+using BizHawk.Client.Common;
+using LuaInterface;
+
+namespace BizHawk.Client.EmuHawk
+{
+	[Description("A library for manipulating the Tastudio dialog of the EmuHawk client")]
+	public sealed class TastudioLuaLibrary : LuaLibraryBase
+	{
+		public TastudioLuaLibrary(Lua lua)
+			: base(lua) { }
+
+		public TastudioLuaLibrary(Lua lua, Action<string> logOutputCallback)
+			: base(lua, logOutputCallback) { }
+
+		public override string Name { get { return "tastudio"; } }
+
+		[LuaMethodAttributes(
+			"engaged",
+			"returns whether or not tastudio is currently engaged (active)"
+		)]
+		public bool Engaged()
+		{
+			return GlobalWin.Tools.Has<TAStudio>(); // TODO: eventually tastudio should have an engaged flag
+		}
+	}
+}