Expose passenger enter/exit notifications to Lua

OpenRA.Mods.Common/Scripting/Global/TriggerGlobal.cs

@@ -51,6 +51,20 @@ namespace OpenRA.Mods.Common.Scripting
 			Context.World.AddFrameEndTask(w => w.Add(new DelayedAction(delay, doCall)));
 		}
 
+		[Desc("Call a function for each passenger when it enters a transport. " +
+		      "The callback function will be called as func(Actor transport, Actor passenger).")]
+		public void OnPassengerEntered(Actor a, LuaFunction func)
+		{
+			GetScriptTriggers(a).RegisterCallback(Trigger.OnPassengerEntered, func, Context);
+		}
+
+		[Desc("Call a function for each passenger when it exits a transport. " +
+			"The callback function will be called as func(Actor transport, Actor passenger).")]
+		public void OnPassengerExited(Actor a, LuaFunction func)
+		{
+			GetScriptTriggers(a).RegisterCallback(Trigger.OnPassengerExited, func, Context);
+		}
+
 		[Desc("Call a function each tick that the actor is idle. " +
 			"The callback function will be called as func(Actor self).")]
 		public void OnIdle(Actor a, LuaFunction func)

OpenRA.Mods.Common/Scripting/ScriptTriggers.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Collections.Generic;
 using Eluant;
+using OpenRA.Mods.Common.Traits;
 using OpenRA.Scripting;
 using OpenRA.Traits;
 
@@ -21,7 +22,8 @@ namespace OpenRA.Mods.Common.Scripting
 	{
 		OnIdle, OnDamaged, OnKilled, OnProduction, OnOtherProduction, OnPlayerWon, OnPlayerLost,
 		OnObjectiveAdded, OnObjectiveCompleted, OnObjectiveFailed, OnCapture, OnInfiltrated,
-		OnAddedToWorld, OnRemovedFromWorld, OnDiscovered, OnPlayerDiscovered
+		OnAddedToWorld, OnRemovedFromWorld, OnDiscovered, OnPlayerDiscovered,
+		OnPassengerEntered, OnPassengerExited
 	}
 
 	[Desc("Allows map scripts to attach triggers to this actor via the Triggers global.")]
@@ -31,7 +33,8 @@ namespace OpenRA.Mods.Common.Scripting
 	}
 
 	public sealed class ScriptTriggers : INotifyIdle, INotifyDamage, INotifyKilled, INotifyProduction, INotifyOtherProduction,
-		INotifyObjectivesUpdated, INotifyCapture, INotifyInfiltrated, INotifyAddedToWorld, INotifyRemovedFromWorld, INotifyDiscovered, INotifyActorDisposing
+		INotifyObjectivesUpdated, INotifyCapture, INotifyInfiltrated, INotifyAddedToWorld, INotifyRemovedFromWorld, INotifyDiscovered, INotifyActorDisposing,
+		INotifyPassengerEntered, INotifyPassengerExited
 	{
 		readonly World world;
 		readonly Actor self;
@@ -421,6 +424,48 @@ namespace OpenRA.Mods.Common.Scripting
 			}
 		}
 
+		void INotifyPassengerEntered.OnPassengerEntered(Actor self, Actor passenger)
+		{
+			if (world.Disposing)
+				return;
+
+			foreach (var f in Triggerables(Trigger.OnPassengerEntered))
+			{
+				try
+				{
+					using (var trans = self.ToLuaValue(f.Context))
+					using (var pass = passenger.ToLuaValue(f.Context))
+						f.Function.Call(trans, pass).Dispose();
+				}
+				catch (Exception ex)
+				{
+					f.Context.FatalError(ex.Message);
+					return;
+				}
+			}
+		}
+
+		void INotifyPassengerExited.OnPassengerExited(Actor self, Actor passenger)
+		{
+			if (world.Disposing)
+				return;
+
+			foreach (var f in Triggerables(Trigger.OnPassengerExited))
+			{
+				try
+				{
+					using (var trans = self.ToLuaValue(f.Context))
+					using (var pass = passenger.ToLuaValue(f.Context))
+						f.Function.Call(trans, pass).Dispose();
+				}
+				catch (Exception ex)
+				{
+					f.Context.FatalError(ex.Message);
+					return;
+				}
+			}
+		}
+
 		public void Clear(Trigger trigger)
 		{
 			world.AddFrameEndTask(w =>