try add gtk2

Makefile

@@ -6,6 +6,9 @@ TARGET = matemateak
 CFLAGS = -std=c17 -Wall -Wextra -Wpedantic -Wconversion
 LFLAGS = -lm
 
+CFLAGS += $(shell pkg-config --cflags gtk+-2.0)
+LFLAGS += $(shell pkg-config --libs gtk+-2.0)
+
 C_FILES = $(shell find src/ -name *.c)
 HEADER_FILES = $(shell find src/ -name *.h)
 

src/main.c

@@ -1,10 +1,11 @@
 #include "lexer.h"
 #include "parser.h"
+#include <gtk/gtk.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-int main(void)
+void test_lexer_parser(void)
 {
     char* text = "2 * (3 + 4)";
 
@@ -28,3 +29,47 @@ int main(void)
     free(ast_string);
     free_expr(ast);
 }
+
+int main(int argc, char** argv)
+{
+    GtkWidget* window;
+    GtkWidget* vbox;
+
+    GtkWidget* menubar;
+    GtkWidget* fileMenu;
+    GtkWidget* fileMi;
+    GtkWidget* quitMi;
+
+    gtk_init(&argc, &argv);
+
+    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
+    gtk_window_set_default_size(GTK_WINDOW(window), 300, 200);
+    gtk_window_set_title(GTK_WINDOW(window), "Simple menu");
+
+    vbox = gtk_vbox_new(FALSE, 0);
+    gtk_container_add(GTK_CONTAINER(window), vbox);
+
+    menubar = gtk_menu_bar_new();
+    fileMenu = gtk_menu_new();
+
+    fileMi = gtk_menu_item_new_with_label("File");
+    quitMi = gtk_menu_item_new_with_label("Quit");
+
+    gtk_menu_item_set_submenu(GTK_MENU_ITEM(fileMi), fileMenu);
+    gtk_menu_shell_append(GTK_MENU_SHELL(fileMenu), quitMi);
+    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), fileMi);
+    gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 0);
+
+    g_signal_connect(
+        G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL
+    );
+
+    g_signal_connect(
+        G_OBJECT(quitMi), "activate", G_CALLBACK(gtk_main_quit), NULL
+    );
+
+    gtk_widget_show_all(window);
+
+    gtk_main();
+}

src/parser.c

@@ -266,7 +266,6 @@ const char* binary_expr_type_to_string(BinaryExprType type)
 
 char* expr_to_string(const Expr* expr)
 {
-    printf("expr->type == %d\n", expr->type);
     switch (expr->type) {
         case ExprTypeError: {
             char formattet[65536];