moved ReturnOnIdle to ra

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -103,6 +103,7 @@
     <Compile Include="RenderSpy.cs" />
     <Compile Include="RepairableNear.cs" />
     <Compile Include="Crates\SpeedUpgradeCrateAction.cs" />
+    <Compile Include="ReturnOnIdle.cs" />
     <Compile Include="SelfHealing.cs" />
     <Compile Include="SonarPulsePower.cs" />
     <Compile Include="Spy.cs" />

OpenRA.Mods.RA/ReturnOnIdle.cs

@@ -0,0 +1,52 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it 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.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using OpenRA.Traits.Activities;
+using System.Drawing;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	class ReturnOnIdleInfo : TraitInfo<ReturnOnIdle> { }
+
+	// fly home or fly-off-map behavior for idle planes
+
+	class ReturnOnIdle : INotifyIdle
+	{
+		public void Idle(Actor self)
+		{
+			var altitude = self.traits.Get<Unit>().Altitude;
+			if (altitude == 0) return;	// we're on the ground, let's stay there.
+
+			var airfield = ReturnToBase.ChooseAirfield(self);
+			if (airfield != null)
+			{
+				self.QueueActivity(new ReturnToBase(self, airfield));
+				self.QueueActivity(new Rearm());
+			}
+			else
+			{
+				Game.Debug("Plane has nowhere to land; flying away");
+				self.QueueActivity(new FlyOffMap());
+			}
+		}
+	}
+}