Remove requirement for server to explicitly generate maps.

OpenRA.Mods.Common/Traits/World/ClassicMapGenerator.cs

@@ -953,6 +953,26 @@ namespace OpenRA.Mods.Common.Traits
 			return map;
 		}
 
+		public bool TryGenerateMetadata(ModData modData, MapGenerationArgs args, out MapPlayers players, out Dictionary<string, MiniYaml> ruleDefinitions)
+		{
+			try
+			{
+				var playerCount = FieldLoader.GetValue<int>("Players", args.Settings.NodeWithKey("Players").Value.Value);
+
+				// Generated maps use the default ruleset
+				ruleDefinitions = [];
+				players = new MapPlayers(modData.DefaultRules, playerCount);
+
+				return true;
+			}
+			catch
+			{
+				players = null;
+				ruleDefinitions = null;
+				return false;
+			}
+		}
+
 		public override object Create(ActorInitializer init)
 		{
 			return new ClassicMapGenerator(init, this);

OpenRA.Mods.Common/Traits/World/ClearMapGenerator.cs

@@ -9,6 +9,7 @@
  */
 #endregion
 
+using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 using OpenRA.Mods.Common.MapGenerator;
@@ -93,6 +94,14 @@ namespace OpenRA.Mods.Common.Traits
 			return map;
 		}
 
+		public bool TryGenerateMetadata(ModData modData, MapGenerationArgs args, out MapPlayers players, out Dictionary<string, MiniYaml> ruleDefinitions)
+		{
+			ruleDefinitions = [];
+			players = new MapPlayers(modData.DefaultRules, 0);
+
+			return true;
+		}
+
 		public override object Create(ActorInitializer init)
 		{
 			return new ClearMapGenerator(this);