Improve flow of command-line debugging

src/window/gdb.rs

@@ -1,6 +1,8 @@
 use egui::{Button, CentralPanel, TextEdit, ViewportBuilder, ViewportId};
+use winit::event_loop::EventLoopProxy;
 
 use crate::{
+    app::UserEvent,
     emulator::{EmulatorClient, SimId},
     gdbserver::{GdbServer, GdbServerStatus},
 };
@@ -10,21 +12,26 @@ use super::AppWindow;
 pub struct GdbServerWindow {
     sim_id: SimId,
     port_str: String,
+    launched: bool,
     server: GdbServer,
+    proxy: EventLoopProxy<UserEvent>,
 }
 
 impl GdbServerWindow {
-    pub fn new(sim_id: SimId, client: EmulatorClient) -> Self {
+    pub fn new(sim_id: SimId, client: EmulatorClient, proxy: EventLoopProxy<UserEvent>) -> Self {
         Self {
             sim_id,
             port_str: (8080 + sim_id.to_index()).to_string(),
+            launched: false,
             server: GdbServer::new(sim_id, client),
+            proxy,
         }
     }
 
-    pub fn start(&mut self, port: u16) {
+    pub fn launch(&mut self, port: u16) {
         self.server.stop();
         self.port_str = port.to_string();
+        self.launched = true;
         self.server.start(port);
     }
 }
@@ -57,6 +64,9 @@ impl AppWindow for GdbServerWindow {
             });
 
             if !status.running() {
+                if self.launched {
+                    self.proxy.send_event(UserEvent::Quit).unwrap();
+                }
                 let start_button = Button::new("Start");
                 if ui.add_enabled(port_num.is_some(), start_button).clicked() {
                     let port = port_num.unwrap();