unsaved shit in the chart editor wip

source/funkin/backend/system/Main.hx

@@ -107,6 +107,7 @@ class Main extends Sprite
 	}
 
 	public static function loadGameSettings() {
+		WindowTitle.init();
 		MemoryUtil.init();
 		@:privateAccess
 		FlxG.game.getTimer = getTimer;

source/funkin/backend/utils/WindowTitle.hx

@@ -0,0 +1,36 @@
+package funkin.backend.utils;
+
+import openfl.Lib;
+
+class WindowTitle {
+	public static var winTitle(default, set):String;
+	public static function set_winTitle(newWinTitle:String):String {
+		winTitle = newWinTitle;
+		updateTitle();
+		return newWinTitle;
+	}
+	public static var prefix(default, set):String = "";
+	public static function set_prefix(newPrefix:String):String {
+		prefix = newPrefix;
+		updateTitle();
+		return newPrefix;
+	}
+	public static var endfix(default, set):String = "";
+	public static function set_endfix(endPrefix:String):String {
+		endfix = endPrefix;
+		updateTitle();
+		return endPrefix;
+	}
+
+	public static inline function init()
+		reset();
+
+	public static inline function reset() {
+		winTitle = Lib.application.meta["name"];
+		prefix = endfix = "";
+		updateTitle();
+	}
+
+	public static inline function updateTitle()
+		Lib.application.window.title = '$prefix$winTitle$endfix';
+}

source/funkin/editors/UndoList.hx

@@ -4,6 +4,12 @@ class UndoList<T> {
 	public var undoList:Array<T> = [];
 	public var redoList:Array<T> = [];
 
+	var savedLength:Int = 0;
+
+	public var unsaved(get, never):Bool;
+	public inline function get_unsaved():Bool
+		return undoList.length != savedLength;
+
 	public function new() {}
 
 	public inline function addToUndo(c:T) {
@@ -26,4 +32,7 @@ class UndoList<T> {
 			undoList.insert(0, redo);
 		return redo;
 	}
+
+	public inline function save()
+		savedLength = undoList.length;
 }

source/funkin/editors/charter/Charter.hx

@@ -97,6 +97,7 @@ class Charter extends UIState {
 	public override function create() {
 		super.create();
 
+		WindowTitle.endfix = " (Chart Editor)";
 		topMenu = [
 			{
 				label: "File",
@@ -468,6 +469,7 @@ class Charter extends UIState {
 			Framerate.memoryCounter.alpha = 1;
 			Framerate.codenameBuildField.alpha = 1;
 		}
+		WindowTitle.reset();
 		super.destroy();
 	}
 
@@ -961,6 +963,8 @@ class Charter extends UIState {
 		if (charterCamera.zoom != (charterCamera.zoom = lerp(charterCamera.zoom, __camZoom, 0.125))) {
 			updateDisplaySprites();
 		}
+
+		WindowTitle.prefix = undos.unsaved ? "UNSAVED | " : "";
 	}
 
 	public static var startTime:Float = 0;
@@ -1016,12 +1020,25 @@ class Charter extends UIState {
 	// TOP MENU OPTIONS
 	#if REGION
 	function _file_exit(_) {
-		FlxG.switchState(new CharterSelection());
+		if (undos.unsaved) {
+			FlxG.state.openSubState(new UIWarningSubstate("Unsaved Changes", "Your changes will be lost if you don't save them.", [
+				{
+					label: "Exit",
+					onClick: function(_) FlxG.switchState(new CharterSelection())
+				},
+				{
+					label: "Cancel",
+					onClick: function (_) {}
+				}
+			]));
+		} else
+			FlxG.switchState(new CharterSelection());
 	}
 
 	function _file_save(_) {
 		#if sys
 		saveTo('${Paths.getAssetsRoot()}/songs/${__song.toLowerCase().replace("-", " ")}');
+		undos.save();
 		return;
 		#end
 		_file_saveas(_);
@@ -1031,6 +1048,7 @@ class Charter extends UIState {
 		openSubState(new SaveSubstate(Json.stringify(Chart.filterChartForSaving(PlayState.SONG, false)), {
 			defaultSaveFile: '${__diff.toLowerCase()}.json'
 		}));
+		undos.save();
 	}
 
 	function _file_meta_save(_) {