Add a lint pass for map metadata.

OpenRA.Mods.Common/Lint/CheckMapMetadata.cs

@@ -0,0 +1,35 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Lint
+{
+	public class CheckMapMetadata : ILintMapPass
+	{
+		public void Run(Action<string> emitError, Action<string> emitWarning, Map map)
+		{
+			if (map.MapFormat < Map.MinimumSupportedMapFormat)
+				emitError("Map format {0} is older than the minimum supported version {1}."
+					.F(map.MapFormat, Map.MinimumSupportedMapFormat));
+
+			if (map.Author == null)
+				emitError("Map does not define a valid author.");
+
+			if (map.Title == null)
+				emitError("Map does not define a valid title.");
+
+			if (map.Type == null)
+				emitError("Map does not define a valid type.");
+		}
+	}
+}