egui: Implement saving command file

Cargo.toml

@@ -26,6 +26,7 @@ geo = "0.25.1"
 rstar = "0.11.0"
 petgraph = "0.6.3"
 spade = "2.2.0"
+serde_json = "1.0.117"
 enum_dispatch = "0.3.12"
 itertools = "0.8.2"
 contracts = "0.6.3"

src/autorouter/history.rs

@@ -1,5 +1,8 @@
+use serde::{Deserialize, Serialize};
+
 use crate::autorouter::invoker::Command;
 
+#[derive(Serialize, Deserialize)]
 pub struct History {
     done: Vec<Command>,
     undone: Vec<Command>,

src/autorouter/invoker.rs

@@ -62,10 +62,9 @@ impl<R: RulesTrait> Invoker<R> {
 
     pub fn undo(&mut self) {
         let command = self.history.done().last().unwrap();
-        let mut execute = self.dispatch_command(command);
 
-        while execute.next(self, &mut EmptyRouterObserver) {
-            //
+        match command {
+            Command::Autoroute(ref selection) => self.autorouter.undo_autoroute(selection),
         }
 
         self.history.undo();
@@ -85,4 +84,8 @@ impl<R: RulesTrait> Invoker<R> {
     pub fn autorouter(&self) -> &Autorouter<R> {
         &self.autorouter
     }
+
+    pub fn history(&self) -> &History {
+        &self.history
+    }
 }

src/bin/topola-egui/app.rs

@@ -2,6 +2,7 @@ use futures::executor;
 use geo::point;
 use petgraph::visit::{EdgeRef, IntoEdgeReferences};
 use std::{
+    fs::File,
     future::Future,
     sync::{
         mpsc::{channel, Receiver, Sender},
@@ -187,15 +188,34 @@ impl eframe::App for App {
                         let task = rfd::AsyncFileDialog::new().pick_file();
 
                         execute(async move {
-                            let maybe_file_handle = task.await;
-
-                            if let Some(file_handle) = maybe_file_handle {
-                                let _ = sender.send(channel_text(file_handle).await);
+                            if let Some(file_handle) = task.await {
+                                sender.send(channel_text(file_handle).await);
                                 ctx.request_repaint();
                             }
                         });
                     }
 
+                    ui.separator();
+
+                    if ui.button("Save history").clicked() {
+                        if let Some(invoker_arc_mutex) = &self.invoker {
+                            let invoker_arc_mutex = invoker_arc_mutex.clone();
+                            let ctx = ui.ctx().clone();
+                            let task = rfd::AsyncFileDialog::new().save_file();
+
+                            execute(async move {
+                                if let Some(file_handle) = task.await {
+                                    let path = file_handle.path();
+                                    let mut file = File::create(path).unwrap();
+                                    let mut invoker = invoker_arc_mutex.lock().unwrap();
+                                    serde_json::to_writer(file, invoker.history());
+                                }
+                            });
+                        }
+                    }
+
+                    ui.separator();
+
                     // "Quit" button wouldn't work on a Web page.
                     if !cfg!(target_arch = "wasm32") {
                         if ui.button("Quit").clicked() {