Enable building rivers in-game.

Controlled by setting, default off.

src/dock_gui.cpp

@@ -101,6 +101,7 @@ struct BuildDocksToolbarWindow : Window {
 		this->InitNested(window_number);
 		this->OnInvalidateData();
 		if (_settings_client.gui.link_terraform_toolbar) ShowTerraformToolbar(this);
+		SetWidgetDisabledState(WID_DT_RIVER, !_settings_game.construction.enable_build_river);
 	}
 
 	~BuildDocksToolbarWindow()
@@ -160,7 +161,7 @@ struct BuildDocksToolbarWindow : Window {
 				break;
 
 			case WID_DT_RIVER: // Build river button (in scenario editor)
-				if (_game_mode != GM_EDITOR) return;
+				if (_game_mode != GM_EDITOR && !_settings_game.construction.enable_build_river) return;
 				HandlePlacePushButton(this, WID_DT_RIVER, SPR_CURSOR_RIVER, HT_RECT);
 				break;
 
@@ -324,6 +325,7 @@ static const NWidgetPart _nested_build_docks_toolbar_widgets[] = {
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_DT_DEPOT), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_SHIP_DEPOT, STR_WATERWAYS_TOOLBAR_BUILD_DEPOT_TOOLTIP),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_DT_STATION), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_SHIP_DOCK, STR_WATERWAYS_TOOLBAR_BUILD_DOCK_TOOLTIP),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_DT_BUOY), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_BUOY, STR_WATERWAYS_TOOLBAR_BUOY_TOOLTIP),
+		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_DT_RIVER), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_BUILD_RIVER, STR_WATERWAYS_TOOLBAR_CREATE_RIVER_TOOLTIP),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_DT_BUILD_AQUEDUCT), SetMinimalSize(23, 22), SetFill(0, 1), SetDataTip(SPR_IMG_AQUEDUCT, STR_WATERWAYS_TOOLBAR_BUILD_AQUEDUCT_TOOLTIP),
 	EndContainer(),
 };

src/lang/english.txt

@@ -1412,6 +1412,9 @@ STR_CONFIG_SETTING_PERSISTENT_BUILDINGTOOLS_HELPTEXT            :Keep the buildi
 STR_CONFIG_SETTING_EXPENSES_LAYOUT                              :Group expenses in company finance window: {STRING2}
 STR_CONFIG_SETTING_EXPENSES_LAYOUT_HELPTEXT                     :Define the layout for the company expenses window
 
+STR_CONFIG_SETTING_ENABLE_BUILD_RIVER                           :Enable building rivers: {STRING2}
+STR_CONFIG_SETTING_ENABLE_BUILD_RIVER_HELPTEXT                  :Enable building rivers outside of the scenario editor
+
 STR_CONFIG_SETTING_SOUND_TICKER                                 :News ticker: {STRING2}
 STR_CONFIG_SETTING_SOUND_TICKER_HELPTEXT                        :Play sound for summarised news messages
 STR_CONFIG_SETTING_SOUND_NEWS                                   :Newspaper: {STRING2}

src/settings_gui.cpp

@@ -1649,6 +1649,7 @@ static SettingsContainer &GetSettingsTree()
 			limitations->Add(new SettingEntry("construction.road_stop_on_town_road"));
 			limitations->Add(new SettingEntry("construction.road_stop_on_competitor_road"));
 			limitations->Add(new SettingEntry("vehicle.disable_elrails"));
+			limitations->Add(new SettingEntry("construction.enable_build_river"));
 		}
 
 		SettingsPage *disasters = main->Add(new SettingsPage(STR_CONFIG_SETTING_ACCIDENTS));

src/settings_type.h

@@ -311,6 +311,7 @@ struct ConstructionSettings {
 	bool   freeform_edges;                   ///< allow terraforming the tiles at the map edges
 	uint8  extra_tree_placement;             ///< (dis)allow building extra trees in-game
 	uint8  command_pause_level;              ///< level/amount of commands that can't be executed while paused
+	bool   enable_build_river;               ///< enable building rivers in-game
 
 	uint32 terraform_per_64k_frames;         ///< how many tile heights may, over a long period, be terraformed per 65536 frames?
 	uint16 terraform_frame_burst;            ///< how many tile heights may, over a short period, be terraformed?

src/table/settings.ini

@@ -418,6 +418,15 @@ str      = STR_CONFIG_SETTING_COMMAND_PAUSE_LEVEL
 strhelp  = STR_CONFIG_SETTING_COMMAND_PAUSE_LEVEL_HELPTEXT
 strval   = STR_CONFIG_SETTING_COMMAND_PAUSE_LEVEL_NO_ACTIONS
 
+[SDT_BOOL]
+base     = GameSettings
+var      = construction.enable_build_river
+def      = false
+cat      = SC_BASIC
+str      = STR_CONFIG_SETTING_ENABLE_BUILD_RIVER
+strhelp  = STR_CONFIG_SETTING_ENABLE_BUILD_RIVER_HELPTEXT
+patxname = ""enable_build_river.construction.enable_build_river""
+
 [SDT_VAR]
 base     = GameSettings
 var      = construction.terraform_per_64k_frames

src/water_cmd.cpp

@@ -387,7 +387,7 @@ bool RiverModifyDesertZone(TileIndex tile, void *)
  * @param tile end tile of stretch-dragging
  * @param flags type of operation
  * @param p1 start tile of stretch-dragging
- * @param p2 waterclass to build. sea and river can only be built in scenario editor
+ * @param p2 waterclass to build. sea and river can only be built in scenario editor, unless enable_build_river is enabled
  * @param text unused
  * @return the cost of this operation or an error
  */
@@ -397,7 +397,13 @@ CommandCost CmdBuildCanal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 	if (p1 >= MapSize() || wc == WATER_CLASS_INVALID) return CMD_ERROR;
 
 	/* Outside of the editor you can only build canals, not oceans */
-	if (wc != WATER_CLASS_CANAL && _game_mode != GM_EDITOR) return CMD_ERROR;
+	if (_game_mode != GM_EDITOR) {
+		if (wc == WATER_CLASS_RIVER) {
+			if (!_settings_game.construction.enable_build_river) return CMD_ERROR;
+		} else if (wc != WATER_CLASS_CANAL) {
+			return CMD_ERROR;
+		}
+	}
 
 	TileArea ta(tile, p1);
 
@@ -452,6 +458,9 @@ CommandCost CmdBuildCanal(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 		}
 
 		cost.AddCost(_price[PR_BUILD_CANAL]);
+		if (wc == WATER_CLASS_RIVER) {
+			cost.AddCost(_price[PR_BUILD_CANAL] * 3);
+		}
 	}
 
 	if (cost.GetCost() == 0) {