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-rw-r--r--src/autoreplace_cmd.cpp39
1 files changed, 25 insertions, 14 deletions
diff --git a/src/autoreplace_cmd.cpp b/src/autoreplace_cmd.cpp
index 4cb3c9bf3..7a5c4c723 100644
--- a/src/autoreplace_cmd.cpp
+++ b/src/autoreplace_cmd.cpp
@@ -213,29 +213,35 @@ static CargoID GetNewCargoTypeForReplace(Vehicle *v, EngineID engine_type, bool
* Get the EngineID of the replacement for a vehicle
* @param v The vehicle to find a replacement for
* @param c The vehicle's owner (it's faster to forward the pointer than refinding it)
- * @return the EngineID of the replacement. INVALID_ENGINE if no buildable replacement is found
+ * @param [out] e the EngineID of the replacement. INVALID_ENGINE if no replacement is found
+ * @return Error if the engine to build is not available
*/
-static EngineID GetNewEngineType(const Vehicle *v, const Company *c)
+static CommandCost GetNewEngineType(const Vehicle *v, const Company *c, EngineID &e)
{
assert(v->type != VEH_TRAIN || !v->IsArticulatedPart());
+ e = INVALID_ENGINE;
+
if (v->type == VEH_TRAIN && Train::From(v)->IsRearDualheaded()) {
/* we build the rear ends of multiheaded trains with the front ones */
- return INVALID_ENGINE;
+ return CommandCost();
}
- EngineID e = EngineReplacementForCompany(c, v->engine_type, v->group_id);
+ e = EngineReplacementForCompany(c, v->engine_type, v->group_id);
+ /* Autoreplace, if engine is available */
if (e != INVALID_ENGINE && IsEngineBuildable(e, v->type, _current_company)) {
- return e;
+ return CommandCost();
}
- if (v->NeedsAutorenewing(c) && // replace if engine is too old
- IsEngineBuildable(v->engine_type, v->type, _current_company)) { // engine can still be build
- return v->engine_type;
- }
+ /* Autorenew if needed */
+ if (v->NeedsAutorenewing(c)) e = v->engine_type;
+
+ /* Nothing to do or all is fine? */
+ if (e == INVALID_ENGINE || IsEngineBuildable(e, v->type, _current_company)) return CommandCost();
- return INVALID_ENGINE;
+ /* The engine we need is not available. Report error to user */
+ return CommandCost(STR_ERROR_RAIL_VEHICLE_NOT_AVAILABLE + v->type);
}
/**
@@ -252,7 +258,9 @@ static CommandCost BuildReplacementVehicle(Vehicle *old_veh, Vehicle **new_vehic
/* Shall the vehicle be replaced? */
const Company *c = Company::Get(_current_company);
- EngineID e = GetNewEngineType(old_veh, c);
+ EngineID e;
+ CommandCost cost = GetNewEngineType(old_veh, c, e);
+ if (cost.Failed()) return cost;
if (e == INVALID_ENGINE) return CommandCost(); // neither autoreplace is set, nor autorenew is triggered
/* Does it need to be refitted */
@@ -260,7 +268,7 @@ static CommandCost BuildReplacementVehicle(Vehicle *old_veh, Vehicle **new_vehic
if (refit_cargo == CT_INVALID) return CommandCost(); // incompatible cargos
/* Build the new vehicle */
- CommandCost cost = DoCommand(old_veh->tile, e, 0, DC_EXEC | DC_AUTOREPLACE, GetCmdBuildVeh(old_veh));
+ cost = DoCommand(old_veh->tile, e, 0, DC_EXEC | DC_AUTOREPLACE, GetCmdBuildVeh(old_veh));
if (cost.Failed()) return cost;
Vehicle *new_veh = Vehicle::Get(_new_vehicle_id);
@@ -662,8 +670,11 @@ CommandCost CmdAutoreplaceVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1
/* Test whether any replacement is set, before issuing a whole lot of commands that would end in nothing changed */
Vehicle *w = v;
bool any_replacements = false;
- while (w != NULL && !any_replacements) {
- any_replacements = (GetNewEngineType(w, c) != INVALID_ENGINE);
+ while (w != NULL) {
+ EngineID e;
+ CommandCost cost = GetNewEngineType(w, c, e);
+ if (cost.Failed()) return cost;
+ any_replacements |= (e != INVALID_ENGINE);
w = (!free_wagon && w->type == VEH_TRAIN ? Train::From(w)->GetNextUnit() : NULL);
}