constants macros: reset(), init() and @:lazy

Co-Authored-By: Ne_Eo <NeeEoo@users.noreply.github.com>

source/funkin/backend/system/MainState.hx

@@ -17,9 +17,13 @@ class MainState extends FlxState {
 	public static var betaWarningShown:Bool = false;
 	public override function create() {
 		super.create();
-		if (!initiated)
+		if (!initiated) {
 			Main.loadGameSettings();
+			Constants.init();
+		}
+
 		initiated = true;
+		Constants.reset();
 
 		#if sys
 		CoolUtil.deleteFolder('./.temp/'); // delete temp folder

source/funkin/backend/system/macros/ConstantsMacro.hx

@@ -0,0 +1,65 @@
+package funkin.backend.system.macros;
+
+#if macro
+import haxe.macro.Context;
+import haxe.macro.Expr;
+#end
+
+class ConstantsMacro {
+	#if macro
+	static function build() {
+		var fields = Context.getBuildFields();
+
+		var resetFields:Array<Expr> = [];
+		var lazyFields:Array<Expr> = [];
+		for(field in fields) {
+			switch(field.kind) {
+				case FVar(t, e):
+					resetFields.push(macro $i{field.name} = ${e});
+
+					var hasLazy = false;
+					for(meta in field.meta) {
+						if(meta.name == ":lazy") {
+							hasLazy = true;
+							break;
+						}
+					}
+
+					if(hasLazy) {
+						lazyFields.push(macro $i{field.name} = ${e});
+						field.kind = FVar(t, null);
+					}
+				default:
+			}
+		}
+
+		fields.push({
+			name: "reset",
+			pos: Context.currentPos(),
+			access: [APublic, AStatic],
+			kind: FFun({
+				args: [],
+				ret: null,
+				expr: macro {
+					$b{resetFields}
+				}
+			})
+		});
+
+		fields.push({
+			name: "init",
+			pos: Context.currentPos(),
+			access: [APublic, AStatic],
+			kind: FFun({
+				args: [],
+				ret: null,
+				expr: macro {
+					$b{lazyFields}
+				}
+			})
+		});
+
+		return fields;
+	}
+	#end
+}

source/funkin/backend/system/updating/UpdateUtil.hx

@@ -22,7 +22,7 @@ class UpdateUtil {
 	}
 
 	public static function checkForUpdates():UpdateCheckCallback {
-		var curTag = 'v${Constants.VERSION}';
+		var curTag = 'v${Application.current.meta.get('version')}';
 		trace(curTag);
 
 		var error = false;