Added GrantRandomCondition trait.

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -301,6 +301,7 @@
     <Compile Include="Traits\Burns.cs" />
     <Compile Include="Traits\ChangesTerrain.cs" />
     <Compile Include="Traits\CommandBarBlacklist.cs" />
+    <Compile Include="Traits\Conditions\GrantRandomCondition.cs" />
     <Compile Include="Traits\Contrail.cs" />
     <Compile Include="Traits\Health.cs" />
     <Compile Include="Traits\HitShape.cs" />

OpenRA.Mods.Common/Traits/Conditions/GrantRandomCondition.cs

@@ -0,0 +1,47 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits.Conditions
+{
+	[Desc("Grants a random condition from a predefined list to the actor when created.")]
+	public class GrantRandomConditionInfo : ITraitInfo
+	{
+		[FieldLoader.Require]
+		[GrantedConditionReference]
+		[Desc("List of conditions to grant from.")]
+		public readonly string[] Conditions = null;
+
+		public object Create(ActorInitializer init) { return new GrantRandomCondition(init.Self, this); }
+	}
+
+	public class GrantRandomCondition : INotifyCreated
+	{
+		readonly GrantRandomConditionInfo info;
+
+		public GrantRandomCondition(Actor self, GrantRandomConditionInfo info)
+		{
+			this.info = info;
+		}
+
+		void INotifyCreated.Created(Actor self)
+		{
+			if (!info.Conditions.Any())
+				return;
+
+			var condition = info.Conditions.Random(self.World.SharedRandom);
+			var conditionManager = self.Trait<ConditionManager>();
+			conditionManager.GrantCondition(self, condition);
+		}
+	}
+}