(svn r3101) -Codechange: added _new_vehicle_id

this var works like _new_train_id and the rest of that kind of vars, except it is set each time a vehicle is build, nomatter what type
	this is a nice tool to code vehicle independent code, which in turn can reduce code duplication
	Right now it's used in ReplaceVehicle() and CmdCloneVehicle()

aircraft_cmd.c

@@ -251,6 +251,7 @@ int32 CmdBuildAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 		v->max_age = e->lifelength * 366;
 
 		_new_aircraft_id = v->index;
+		_new_vehicle_id = v->index;
 
 		v->u.air.pos = MAX_ELEMENTS;
 

roadveh_cmd.c

@@ -176,6 +176,7 @@ int32 CmdBuildRoadVeh(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 		v->reliability_spd_dec = e->reliability_spd_dec;
 		v->max_age = e->lifelength * 366;
 		_new_roadveh_id = v->index;
+		_new_vehicle_id = v->index;
 
 		v->string_id = STR_SV_ROADVEH_NAME;
 

ship_cmd.c

@@ -907,6 +907,7 @@ int32 CmdBuildShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 		v->reliability_spd_dec = e->reliability_spd_dec;
 		v->max_age = e->lifelength * 366;
 		_new_ship_id = v->index;
+		_new_vehicle_id = v->index;
 
 		v->string_id = STR_SV_SHIP_NAME;
 		v->u.ship.state = 0x80;

train_cmd.c

@@ -471,6 +471,7 @@ static int32 CmdBuildRailWagon(EngineID engine, TileIndex tile, uint32 flags)
 			v->cur_image = 0xAC2;
 
 			_new_wagon_id = v->index;
+			_new_vehicle_id = v->index;
 
 			VehiclePositionChanged(v);
 			TrainConsistChanged(GetFirstVehicleInChain(v));
@@ -632,6 +633,7 @@ int32 CmdBuildRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 			v->string_id = STR_SV_TRAIN_NAME;
 			v->u.rail.railtype = e->railtype;
 			_new_train_id = v->index;
+			_new_vehicle_id = v->index;
 
 			v->service_interval = _patches.servint_trains;
 			v->date_of_last_service = _date;

vehicle.c

@@ -1403,13 +1403,6 @@ void AgeVehicle(Vehicle *v)
 	}
 }
 
-static VehicleID * _new_vehicle_id_proc_table[] = {
-	&_new_train_id,
-	&_new_roadveh_id,
-	&_new_ship_id,
-	&_new_aircraft_id,
-};
-
 /** Clone a vehicle. If it is a train, it will clone all the cars too
 * @param x,y depot where the cloned vehicle is build
 * @param p1 the original vehicle's index
@@ -1420,7 +1413,7 @@ int32 CmdCloneVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 	Vehicle *v_front, *v;
 	Vehicle *w_front, *w, *w_rear;
 	int cost, total_cost = 0;
-	VehicleID *new_id;
+//	VehicleID *new_id;
 
 	if (!IsVehicleIndex(p1))
 		return CMD_ERROR;
@@ -1444,8 +1437,6 @@ int32 CmdCloneVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 
 	if (v->type == VEH_Train && v->subtype != TS_Front_Engine) return CMD_ERROR;
 
-	new_id = _new_vehicle_id_proc_table[v->type - VEH_Train];
-
 	do {
 		cost = DoCommand(x, y, v->engine_type, 3, flags, CMD_BUILD_VEH(v->type));
 
@@ -1454,11 +1445,7 @@ int32 CmdCloneVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 		total_cost += cost;
 
 		if (flags & DC_EXEC) {
-			if (v->type == VEH_Train && RailVehInfo(v->engine_type)->flags & RVI_WAGON) {
-				w = GetVehicle(_new_wagon_id);
-			} else {
-				w = GetVehicle(*new_id);
-			}
+			w= GetVehicle(_new_vehicle_id);
 
 			if (v->type != VEH_Road) { // road vehicles can't be refitted
 				if (v->cargo_type != w->cargo_type) {
@@ -1468,7 +1455,6 @@ int32 CmdCloneVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 
 			if (v->type == VEH_Train && v->subtype != TS_Front_Engine) {
 				// this s a train car
-
 				// add this unit to the end of the train
 				DoCommand(x, y, (w_rear->index << 16) | w->index, 1, flags, CMD_MOVE_RAIL_VEHICLE);
 			} else {
@@ -1521,8 +1507,8 @@ static int32 ReplaceVehicle(Vehicle **w, byte flags)
 	if (CmdFailed(cost)) return cost;
 
 	if (flags & DC_EXEC) {
-		new_v = GetVehicle(*_new_vehicle_id_proc_table[old_v->type - VEH_Train]);
-		*w = new_v;
+		new_v = GetVehicle(_new_vehicle_id);
+		*w = new_v;	//we changed the vehicle, so MaybeReplaceVehicle needs to work on the new one. Now we tell it what the new one is
 
 		/* refit if needed */
 		if (new_v->type != VEH_Road) { // road vehicles can't be refitted

vehicle.h

@@ -442,6 +442,7 @@ VARDEF VehicleID _new_wagon_id;
 VARDEF VehicleID _new_aircraft_id;
 VARDEF VehicleID _new_ship_id;
 VARDEF VehicleID _new_roadveh_id;
+VARDEF VehicleID _new_vehicle_id;
 VARDEF uint16 _aircraft_refit_capacity;
 VARDEF byte _cmd_build_rail_veh_score;