start gui with exemple

src/main.rs

@@ -1,13 +1,18 @@
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+#![allow(rustdoc::missing_crate_level_docs)] // it's an example
+use eframe::egui;
 use std::env;
 use std::fs::File;
 use std::io::prelude::*;
 use std::io::{Seek, SeekFrom};
 
 mod byte_writer;
+mod gui;
 mod node;
 mod read_and_write;
 
 use byte_writer::{binary_to_string, string_to_binary};
+use gui::MyApp;
 use node::{Node, create_tree, nodes_at_vec, read_tree, tree_to_map, tree_to_string};
 use read_and_write::{body_to_bin, get_map_file, is_valid_file, read_n_bytes};
 
@@ -104,8 +109,20 @@ fn main() -> std::io::Result<()> {
             }
         }
         None => {
-            println!("No argument to deal with !");
-            display_options();
+            let options = eframe::NativeOptions {
+                viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
+                ..Default::default()
+            };
+            let _ = eframe::run_native(
+                "My egui App",
+                options,
+                Box::new(|cc| {
+                    // This gives us image support:
+                    egui_extras::install_image_loaders(&cc.egui_ctx);
+
+                    Ok(Box::<MyApp>::default())
+                }),
+            );
         }
     }