Function CmdCreateGroup

src/group_cmd.cpp:348–384

* Create a new vehicle group. * @param flags type of operation * @param vt vehicle type * @param parent_group parent groupid * @return the cost of this operation or an error */

 * @return the cost of this operation or an error
 */
std::tuple<CommandCost, GroupID> CmdCreateGroup(DoCommandFlags flags, VehicleType vt, GroupID parent_group)
{
	if (!IsCompanyBuildableVehicleType(vt)) return { CMD_ERROR, GroupID::Invalid() };

	if (!Group::CanAllocateItem()) return { CMD_ERROR, GroupID::Invalid() };

	Group *pg = Group::GetIfValid(parent_group);
	if (pg != nullptr) {
		if (pg->owner != _current_company) return { CMD_ERROR, GroupID::Invalid() };
		if (pg->vehicle_type != vt) return { CMD_ERROR, GroupID::Invalid() };
	}

	if (flags.Test(DoCommandFlag::Execute)) {
		Group *g = new Group(_current_company, vt);

		Company *c = Company::Get(g->owner);
		g->number = c->freegroups.UseID(c->freegroups.NextID());
		if (pg == nullptr) {
			g->livery.colour1 = c->livery[LS_DEFAULT].colour1;
			g->livery.colour2 = c->livery[LS_DEFAULT].colour2;
			if (c->settings.renew_keep_length) g->flags.Set(GroupFlag::ReplaceWagonRemoval);
		} else {
			g->parent = pg->index;
			g->livery.colour1 = pg->livery.colour1;
			g->livery.colour2 = pg->livery.colour2;
			g->flags = pg->flags;
			pg->children.insert(g->index);
		}

		InvalidateWindowData(GetWindowClassForVehicleType(vt), VehicleListIdentifier(VL_GROUP_LIST, vt, _current_company).ToWindowNumber());
		InvalidateWindowData(WC_COMPANY_COLOUR, g->owner, g->vehicle_type);

		return { CommandCost(), g->index };
	}

	return { CommandCost(), GroupID::Invalid()};
}


/**