Function CmdIndustrySetProduction

src/industry_cmd.cpp:2178–2222

* Set industry production. * @param flags Type of operation. * @param ind_id IndustryID * @param prod_level Production level. * @param show_news Show a news message on production change. * @param custom_news Custom news message text. * @return Empty cost or an error. */

 * @return Empty cost or an error.
 */
CommandCost CmdIndustrySetProduction(DoCommandFlags flags, IndustryID ind_id, uint8_t prod_level, bool show_news, const EncodedString &custom_news)
{
	if (_current_company != OWNER_DEITY) return CMD_ERROR;
	if (prod_level < PRODLEVEL_MINIMUM || prod_level > PRODLEVEL_MAXIMUM) return CMD_ERROR;

	Industry *ind = Industry::GetIfValid(ind_id);
	if (ind == nullptr) return CMD_ERROR;

	if (flags.Test(DoCommandFlag::Execute)) {
		ind->ctlflags.Set(IndustryControlFlag::ExternalProdLevel);
		ind->prod_level = prod_level;
		ind->RecomputeProductionMultipliers();

		/* Show news message if requested. */
		if (show_news && prod_level != ind->prod_level) {
			NewsType nt;
			switch (WhoCanServiceIndustry(ind)) {
				case 0: nt = NewsType::IndustryNobody;  break;
				case 1: nt = NewsType::IndustryOther;   break;
				case 2: nt = NewsType::IndustryCompany; break;
				default: NOT_REACHED();
			}

			/* Set parameters of news string */
			EncodedString headline;
			if (!custom_news.empty()) {
				headline = custom_news;
			} else {
				StringID str = (prod_level > ind->prod_level)
					? GetIndustrySpec(ind->type)->production_up_text
					: GetIndustrySpec(ind->type)->production_down_text;

				if (str > STR_LAST_STRINGID) {
					headline = GetEncodedString(str, STR_TOWN_NAME, ind->town->index, GetIndustrySpec(ind->type)->name);
				} else {
					headline = GetEncodedString(str, ind->index);
				}
			}

			AddIndustryNewsItem(std::move(headline), nt, ind->index);
		}
	}

	return CommandCost();
}

/**
 * Change exclusive consumer or supplier for the industry.