Main Window and list clear

* designed basic window
* implemented free function to clear library structures

main.c

@@ -1,14 +1,43 @@
 #include <stdio.h>
 #include "gdsparse.h"
+#include <gtk/gtk.h>
 
-
-int main()
+gboolean on_window_close(gpointer window, gpointer user)
 {
-	GList *libs = NULL;
-	unsigned int count = 0;
-	int i = 0;
+	gtk_widget_destroy(GTK_WIDGET(window));
+	gtk_main_quit();
+	return TRUE;
+}
 
-	parse_gds_from_file("/home/mari/Desktop/test.gds", &libs);
+void on_load_gds(gpointer button, gpointer user)
+{
+	GList **list_ptr = (GList **)user;
+
+	// TODO: File dialog
+	clear_lib_list(list_ptr);
+	parse_gds_from_file("/home/mari/Desktop/test.gds", list_ptr);
+}
+
+void on_convert_clicked(gpointer button, gpointer user)
+{
+	printf("convert\n");
+}
+
+int main(int argc, char **argv)
+{
+	GtkBuilder *main_builder;
+	GList *gds_libs = NULL;
+
+	gtk_init(&argc, &argv);
+
+	main_builder = gtk_builder_new_from_file("glade/main.glade");
+	gtk_builder_connect_signals(main_builder, NULL);
+
+	g_signal_connect(GTK_WIDGET(gtk_builder_get_object(main_builder, "button-load-gds")),
+			 "clicked", G_CALLBACK(on_load_gds), (gpointer)&gds_libs);
+
+
+	gtk_main();
 
 	return 0;
 }