Add ability for notifiers to add at front, fix for hiscore [Carl]

plugins/hiscore/init.lua

@@ -127,7 +127,7 @@ function hiscore.startplugin()
 
 
 	function write_scores ( posdata )
-	print("write_scores")
+	  print("write_scores")
 	  local output = io.open(get_file_name(), "wb");
 	  if not output then
 		-- attempt to create the directory, and try again
@@ -242,9 +242,8 @@ function hiscore.startplugin()
 		current_game = ""
 		mem_check_passed = false
 	   	scores_have_been_read = false;
+		last_write_time = -10
 	  	print("Starting " .. emu.gamename())
-		-- check if we've just soft reset
-		-- reset() -- there's no way to reliably save scores after a soft reset currently 
 		current_game = emu.romname()
 		dat = read_hiscore_dat()
 		if dat and dat ~= "" then
@@ -254,14 +253,17 @@ function hiscore.startplugin()
 				print("hiscore.dat parse error");
 				return;
 			end
-			emu.sethook( tick, "frame" );
-			emu.register_stop(function()
-				reset()
-			end)
-		end		
 
+		end		
+		emu.sethook( tick, "frame" );
 	end)
     
+	emu.register_stop(function()
+		reset()
+	end)
+	emu.register_prestart(function()
+		reset()
+	end)
 end
 
 return exports

src/emu/luaengine.cpp

@@ -1319,6 +1319,11 @@ int lua_engine::register_function(lua_State *L, const char *id)
 	return 1;
 }
 
+int lua_engine::l_emu_register_prestart(lua_State *L)
+{
+	return register_function(L, "LUA_ON_PRESTART");
+}
+
 int lua_engine::l_emu_register_start(lua_State *L)
 {
 	return register_function(L, "LUA_ON_START");
@@ -1344,6 +1349,11 @@ int lua_engine::l_emu_register_frame(lua_State *L)
 	return register_function(L, "LUA_ON_FRAME");
 }
 
+void lua_engine::on_machine_prestart()
+{
+	execute_function("LUA_ON_PRESTART");
+}
+
 void lua_engine::on_machine_start()
 {
 	execute_function("LUA_ON_START");
@@ -1393,6 +1403,7 @@ void lua_engine::update_machine()
 
 void lua_engine::attach_notifiers()
 {
+	machine().add_notifier(MACHINE_NOTIFY_RESET, machine_notify_delegate(FUNC(lua_engine::on_machine_prestart), this), true);
 	machine().add_notifier(MACHINE_NOTIFY_RESET, machine_notify_delegate(FUNC(lua_engine::on_machine_start), this));
 	machine().add_notifier(MACHINE_NOTIFY_EXIT, machine_notify_delegate(FUNC(lua_engine::on_machine_stop), this));
 	machine().add_notifier(MACHINE_NOTIFY_PAUSE, machine_notify_delegate(FUNC(lua_engine::on_machine_pause), this));
@@ -1439,6 +1450,7 @@ void lua_engine::initialize()
 			.addCFunction ("start",       l_emu_start )
 			.addCFunction ("pause",       l_emu_pause )
 			.addCFunction ("unpause",     l_emu_unpause )
+			.addCFunction ("register_prestart", l_emu_register_prestart )
 			.addCFunction ("register_start", l_emu_register_start )
 			.addCFunction ("register_stop",  l_emu_register_stop )
 			.addCFunction ("register_pause", l_emu_register_pause )

src/emu/luaengine.h

@@ -83,6 +83,7 @@ private:
 
 	void update_machine();
 
+	void on_machine_prestart();
 	void on_machine_start();
 	void on_machine_stop();
 	void on_machine_pause();
@@ -114,6 +115,7 @@ private:
 	static int l_emu_pause(lua_State *L);
 	static int l_emu_unpause(lua_State *L);
 	static int l_emu_set_hook(lua_State *L);
+	static int l_emu_register_prestart(lua_State *L);
 	static int l_emu_register_start(lua_State *L);
 	static int l_emu_register_stop(lua_State *L);
 	static int l_emu_register_pause(lua_State *L);

src/emu/machine.cpp

@@ -739,12 +739,15 @@ void running_machine::toggle_pause()
 //  given type
 //-------------------------------------------------
 
-void running_machine::add_notifier(machine_notification event, machine_notify_delegate callback)
+void running_machine::add_notifier(machine_notification event, machine_notify_delegate callback, bool first)
 {
 	assert_always(m_current_phase == MACHINE_PHASE_INIT, "Can only call add_notifier at init time!");
 
+	if(first)
+		m_notifier_list[event].push_front(std::make_unique<notifier_callback_item>(callback));
+
 	// exit notifiers are added to the head, and executed in reverse order
-	if (event == MACHINE_NOTIFY_EXIT)
+	else if (event == MACHINE_NOTIFY_EXIT)
 		m_notifier_list[event].push_front(std::make_unique<notifier_callback_item>(callback));
 
 	// all other notifiers are added to the tail, and executed in the order registered

src/emu/machine.h

@@ -214,7 +214,7 @@ public:
 	void pause();
 	void resume();
 	void toggle_pause();
-	void add_notifier(machine_notification event, machine_notify_delegate callback);
+	void add_notifier(machine_notification event, machine_notify_delegate callback, bool first = false);
 	void call_notifiers(machine_notification which);
 	void add_logerror_callback(logerror_callback callback);
 	void set_ui_active(bool active) { m_ui_active = active; }