autorouter: encapsulate command history in a `History` object

src/autorouter/autorouter.rs

@@ -35,7 +35,7 @@ pub struct Autoroute {
 impl Autoroute {
     pub fn new(
         ratlines: impl IntoIterator<Item = EdgeIndex<usize>> + 'static,
-        autorouter: &mut Autorouter<impl RulesTrait>,
+        autorouter: &Autorouter<impl RulesTrait>,
     ) -> Option<Self> {
         let mut ratlines_iter = Box::new(ratlines.into_iter());
 
@@ -146,7 +146,7 @@ impl<R: RulesTrait> Autorouter<R> {
         }
     }
 
-    pub fn autoroute_walk(&mut self, selection: &Selection) -> Option<Autoroute> {
+    pub fn autoroute_walk(&self, selection: &Selection) -> Option<Autoroute> {
         Autoroute::new(self.selected_ratlines(selection), self)
     }
 

src/autorouter/history.rs

@@ -0,0 +1,37 @@
+use crate::autorouter::invoker::Command;
+
+pub struct History {
+    done: Vec<Command>,
+    undone: Vec<Command>,
+}
+
+impl History {
+    pub fn new() -> Self {
+        Self {
+            done: vec![],
+            undone: vec![],
+        }
+    }
+
+    pub fn do_(&mut self, command: Command) {
+        self.done.push(command);
+    }
+
+    pub fn undo(&mut self) {
+        let command = self.done.pop().unwrap();
+        self.undone.push(command);
+    }
+
+    pub fn redo(&mut self) {
+        let command = self.undone.pop().unwrap();
+        self.done.push(command);
+    }
+
+    pub fn done(&self) -> &[Command] {
+        &self.done
+    }
+
+    pub fn undone(&self) -> &[Command] {
+        &self.undone
+    }
+}

src/autorouter/invoker.rs

@@ -1,9 +1,10 @@
 use crate::{
-    autorouter::{selection::Selection, Autoroute, Autorouter},
+    autorouter::{history::History, selection::Selection, Autoroute, Autorouter},
     drawing::rules::RulesTrait,
-    router::RouterObserverTrait,
+    router::{EmptyRouterObserver, RouterObserverTrait},
 };
 
+#[derive(serde::Serialize, serde::Deserialize)]
 pub enum Command {
     Autoroute(Selection),
 }
@@ -26,16 +27,14 @@ impl Execute {
 
 pub struct Invoker<R: RulesTrait> {
     autorouter: Autorouter<R>,
-    history: Vec<Command>,
+    history: History,
-    undone_history: Vec<Command>,
 }
 
 impl<R: RulesTrait> Invoker<R> {
     pub fn new(autorouter: Autorouter<R>) -> Self {
         Self {
             autorouter,
-            history: vec![],
+            history: History::new(),
-            undone_history: vec![],
         }
     }
 
@@ -48,31 +47,39 @@ impl<R: RulesTrait> Invoker<R> {
     }
 
     pub fn execute_walk(&mut self, command: Command) -> Execute {
-        let execute = match command {
+        let execute = self.dispatch_command(&command);
-            Command::Autoroute(ref selection) => {
+        self.history.do_(command);
-                Execute::Autoroute(self.autorouter.autoroute_walk(selection).unwrap())
-            }
-        };
-
-        self.history.push(command);
         execute
     }
 
-    pub fn undo(&mut self) {
+    fn dispatch_command(&self, command: &Command) -> Execute {
-        let command = self.history.pop().unwrap();
-
         match command {
             Command::Autoroute(ref selection) => {
-                self.autorouter.undo_autoroute(selection);
+                Execute::Autoroute(self.autorouter.autoroute_walk(selection).unwrap())
+            }
         }
     }
 
-        self.undone_history.push(command);
+    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) {
+            //
         }
 
-    pub fn redo(&mut self, observer: &mut impl RouterObserverTrait<R>) {
+        self.history.undo();
-        let command = self.undone_history.pop().unwrap();
+    }
-        self.execute(command, observer);
+
+    pub fn redo(&mut self) {
+        let command = self.history.undone().last().unwrap();
+        let mut execute = self.dispatch_command(command);
+
+        while execute.next(self, &mut EmptyRouterObserver) {
+            //
+        }
+
+        self.history.redo();
     }
 
     pub fn autorouter(&self) -> &Autorouter<R> {

src/autorouter/mod.rs

@@ -1,4 +1,5 @@
 mod autorouter;
+pub mod history;
 pub mod invoker;
 pub mod ratsnest;
 pub mod selection;

src/autorouter/selection.rs

@@ -6,10 +6,12 @@ use crate::{
     layout::{zone::ZoneWeight, Layout, NodeIndex},
 };
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
 pub struct Selection {
     pins: HashSet<String>,
+    #[serde(skip)]
     primitives: HashSet<PrimitiveIndex>,
+    #[serde(skip)]
     zones: HashSet<GenericIndex<ZoneWeight>>,
 }
 

src/bin/topola-egui/app.rs

@@ -260,12 +260,7 @@ impl eframe::App for App {
                 {
                     if let Some(invoker_arc_mutex) = &self.invoker {
                         let invoker_arc_mutex = invoker_arc_mutex.clone();
-                        execute(async move {
+                        execute(async move { invoker_arc_mutex.lock().unwrap().redo() });
-                            invoker_arc_mutex
-                                .lock()
-                                .unwrap()
-                                .redo(&mut EmptyRouterObserver);
-                        });
                     }
                 }