Add company settings to enable competitors' to buy/renew in own depots.

src/lang/english.txt

@@ -1472,6 +1472,10 @@ STR_CONFIG_SETTING_SHARING_FEE_AIR                              :Terminal fee fo
 STR_CONFIG_SETTING_SHARING_PAYMENT_IN_DEBT                      :Allow companies in debt to pay sharing fees: {STRING2}
 STR_CONFIG_SETTING_SHARING_USED_BY_VEHICLES                     :Can't change this setting, vehicles are using shared infrastructure.
 STR_CONFIG_SETTING_SHARING_ORDERS_TO_OTHERS                     :Can't change this setting, vehicles have orders to destinations of others.
+STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_RAIL               :Enable competitors to buy and renew trains in depots: {STRING2}
+STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_ROAD               :Enable competitors to buy and renew road vehicles in depots: {STRING2}
+STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_WATER              :Enable competitors to buy and renew ships in depots: {STRING2}
+STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_AIR                :Enable competitors to buy and renew aircraft in hangars: {STRING2}
 
 STR_CONFIG_SETTING_SERVINT_ISPERCENT                            :Service intervals are in percents: {STRING2}
 STR_CONFIG_SETTING_SERVINT_ISPERCENT_HELPTEXT                   :Choose whether servicing of vehicles is triggered by the time passed since last service or by reliability dropping by a certain percentage of the maximum reliability

src/settings_gui.cpp

@@ -1586,6 +1586,10 @@ static SettingsContainer &GetSettingsTree()
 			company->Add(new SettingEntry("vehicle.servint_roadveh"));
 			company->Add(new SettingEntry("vehicle.servint_ships"));
 			company->Add(new SettingEntry("vehicle.servint_aircraft"));
+			company->Add(new SettingEntry("company.infra_others_buy_in_depot[0]"));
+			company->Add(new SettingEntry("company.infra_others_buy_in_depot[1]"));
+			company->Add(new SettingEntry("company.infra_others_buy_in_depot[2]"));
+			company->Add(new SettingEntry("company.infra_others_buy_in_depot[3]"));
 		}
 
 		SettingsPage *accounting = main->Add(new SettingsPage(STR_CONFIG_SETTING_ACCOUNTING));

src/settings_type.h

@@ -538,6 +538,7 @@ struct CompanySettings {
 	uint32 engine_renew_money;               ///< minimum amount of money before autorenew is used
 	bool renew_keep_length;                  ///< sell some wagons if after autoreplace the train is longer than before
 	VehicleDefaultSettings vehicle;          ///< default settings for vehicles
+	bool infra_others_buy_in_depot[4];       ///< other companies can buy/autorenew in this companies depots (where infra sharing enabled)
 };
 
 /** All settings together for the game. */

src/table/company_settings.ini

@@ -135,6 +135,38 @@ strhelp  = STR_CONFIG_SETTING_SERVINT_AIRCRAFT_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
 proc     = UpdateIntervalAircraft
 
+[SDT_BOOL]
+base     = CompanySettings
+var      = infra_others_buy_in_depot[0]
+guiflags = SGF_PER_COMPANY
+def      = false
+str      = STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_RAIL
+patxname = ""infra_sharing.infra_others_buy_in_depot.rail""
+
+[SDT_BOOL]
+base     = CompanySettings
+var      = infra_others_buy_in_depot[1]
+guiflags = SGF_PER_COMPANY
+def      = false
+str      = STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_ROAD
+patxname = ""infra_sharing.infra_others_buy_in_depot.road""
+
+[SDT_BOOL]
+base     = CompanySettings
+var      = infra_others_buy_in_depot[2]
+guiflags = SGF_PER_COMPANY
+def      = false
+str      = STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_WATER
+patxname = ""infra_sharing.infra_others_buy_in_depot.water""
+
+[SDT_BOOL]
+base     = CompanySettings
+var      = infra_others_buy_in_depot[3]
+guiflags = SGF_PER_COMPANY
+def      = false
+str      = STR_CONFIG_SETTING_INFRA_OTHERS_BUY_IN_DEPOT_AIR
+patxname = ""infra_sharing.infra_others_buy_in_depot.air""
+
 [SDT_END]
 
 

src/vehicle_cmd.cpp

@@ -86,9 +86,15 @@ CommandCost CmdBuildAircraft   (TileIndex tile, DoCommandFlag flags, const Engin
 CommandCost CmdBuildVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {
 	/* Elementary check for valid location. */
-	if (!IsDepotTile(tile) || !IsTileOwner(tile, _current_company)) return CMD_ERROR;
+	if (!IsDepotTile(tile)) return CMD_ERROR;
 
 	VehicleType type = GetDepotVehicleType(tile);
+	if (!IsTileOwner(tile, _current_company)) {
+		if (!_settings_game.economy.infrastructure_sharing[type]) return CMD_ERROR;
+
+		const Company *c = Company::GetIfValid(GetTileOwner(tile));
+		if (c == NULL || !c->settings.infra_others_buy_in_depot[type]) return CMD_ERROR;
+	}
 
 	/* Validate the engine type. */
 	EngineID eid = GB(p1, 0, 16);