Add sim.historyRestore and sim.historyForward

src/gui/game/GameController.cpp

@@ -164,11 +164,11 @@ GameController::~GameController()
 	}
 }
 
-void GameController::HistoryRestore()
+bool GameController::HistoryRestore()
 {
 	if (!gameModel->HistoryCanRestore())
 	{
-		return;
+		return false;
 	}
 	// * When undoing for the first time since the last call to HistorySnapshot, save the current state.
 	//   Ctrl+Y needs this in order to bring you back to the point right before your last Ctrl+Z, because
@@ -182,6 +182,8 @@ void GameController::HistoryRestore()
 	auto &current = *gameModel->HistoryCurrent();
 	gameModel->GetSimulation()->Restore(current);
 	Client::Ref().OverwriteAuthorInfo(current.Authors);
+
+	return true;
 }
 
 void GameController::HistorySnapshot()
@@ -192,11 +194,11 @@ void GameController::HistorySnapshot()
 	gameModel->HistoryPush(gameModel->GetSimulation()->CreateSnapshot());
 }
 
-void GameController::HistoryForward()
+bool GameController::HistoryForward()
 {
 	if (!gameModel->HistoryCanForward())
 	{
-		return;
+		return false;
 	}
 	gameModel->HistoryForward();
 	// * If gameModel has nothing more to give, we've Ctrl+Y'd our way back to the original
@@ -208,6 +210,8 @@ void GameController::HistoryForward()
 	{
 		beforeRestore.reset();
 	}
+
+	return true;
 }
 
 GameView * GameController::GetView()

src/gui/game/GameController.h

@@ -87,9 +87,9 @@ public:
 
 	void Install();
 
-	void HistoryRestore();
+	bool HistoryRestore();
 	void HistorySnapshot();
-	void HistoryForward();
+	bool HistoryForward();
 
 	void AdjustGridSize(int direction);
 	void InvertAirSim();

src/lua/LuaScriptInterface.cpp

@@ -935,6 +935,8 @@ void LuaScriptInterface::initSimulationAPI()
 		{"framerender", simulation_framerender},
 		{"gspeed", simulation_gspeed},
 		{"takeSnapshot", simulation_takeSnapshot},
+		{"historyRestore", simulation_historyRestore},
+		{"historyForward", simulation_historyForward},
 		{"replaceModeFlags", simulation_replaceModeFlags},
 		{"listCustomGol", simulation_listCustomGol},
 		{"addCustomGol", simulation_addCustomGol},
@@ -2399,6 +2401,21 @@ int LuaScriptInterface::simulation_takeSnapshot(lua_State * l)
 	return 0;
 }
 
+
+int LuaScriptInterface::simulation_historyRestore(lua_State *l)
+{
+	bool successful = luacon_controller->HistoryRestore();
+	lua_pushboolean(l, successful);
+	return 1;
+}
+
+int LuaScriptInterface::simulation_historyForward(lua_State *l)
+{
+	bool successful = luacon_controller->HistoryForward();
+	lua_pushboolean(l, successful);
+	return 1;
+}
+
 int LuaScriptInterface::simulation_replaceModeFlags(lua_State *l)
 {
 	if (lua_gettop(l) == 0)

src/lua/LuaScriptInterface.h

@@ -115,6 +115,8 @@ class LuaScriptInterface: public CommandInterface
 	static int simulation_framerender(lua_State * l);
 	static int simulation_gspeed(lua_State * l);
 	static int simulation_takeSnapshot(lua_State *l);
+	static int simulation_historyRestore(lua_State *l);
+	static int simulation_historyForward(lua_State *l);
 	static int simulation_replaceModeFlags(lua_State *l);
 	static int simulation_listCustomGol(lua_State *l);
 	static int simulation_addCustomGol(lua_State *l);