autorouter: move autoroute command to its own file

Since it accesses `Autorouter`'s fields, I made these `pub(super)`. This
feels unidiomatic, but let's give it a shot.

src/autorouter/autoroute.rs

@@ -0,0 +1,82 @@
+use petgraph::graph::EdgeIndex;
+
+use crate::{
+    autorouter::{Autorouter, AutorouterError, AutorouterStatus},
+    board::mesadata::MesadataTrait,
+    router::{navmesh::Navmesh, RouterObserverTrait},
+};
+
+pub struct Autoroute {
+    ratlines_iter: Box<dyn Iterator<Item = EdgeIndex<usize>>>,
+    navmesh: Option<Navmesh>, // Useful for debugging.
+    cur_ratline: Option<EdgeIndex<usize>>,
+}
+
+impl Autoroute {
+    pub fn new(
+        ratlines: impl IntoIterator<Item = EdgeIndex<usize>> + 'static,
+        autorouter: &mut Autorouter<impl MesadataTrait>,
+    ) -> Result<Self, AutorouterError> {
+        let mut ratlines_iter = Box::new(ratlines.into_iter());
+
+        let Some(cur_ratline) = ratlines_iter.next() else {
+            return Err(AutorouterError::NothingToRoute);
+        };
+
+        let (source, target) = autorouter.ratline_endpoints(cur_ratline);
+        let navmesh = Some(Navmesh::new(autorouter.board.layout(), source, target)?);
+
+        let this = Self {
+            ratlines_iter,
+            navmesh,
+            cur_ratline: Some(cur_ratline),
+        };
+
+        Ok(this)
+    }
+
+    pub fn step<M: MesadataTrait>(
+        &mut self,
+        autorouter: &mut Autorouter<M>,
+        observer: &mut impl RouterObserverTrait<M>,
+    ) -> Result<AutorouterStatus, AutorouterError> {
+        let (new_navmesh, new_ratline) = if let Some(cur_ratline) = self.ratlines_iter.next() {
+            let (source, target) = autorouter.ratline_endpoints(cur_ratline);
+
+            (
+                Some(
+                    Navmesh::new(autorouter.board.layout(), source, target)
+                        .ok()
+                        .unwrap(),
+                ),
+                Some(cur_ratline),
+            )
+        } else {
+            (None, None)
+        };
+
+        match autorouter.board.route_band(
+            std::mem::replace(&mut self.navmesh, new_navmesh).unwrap(),
+            100.0,
+            observer,
+        ) {
+            Ok(band) => {
+                autorouter
+                    .ratsnest
+                    .assign_band_to_ratline(self.cur_ratline.unwrap(), band);
+                self.cur_ratline = new_ratline;
+
+                if self.navmesh.is_some() {
+                    Ok(AutorouterStatus::Running)
+                } else {
+                    Ok(AutorouterStatus::Finished)
+                }
+            }
+            Err(err) => Err(AutorouterError::Router(err)),
+        }
+    }
+
+    pub fn navmesh(&self) -> &Option<Navmesh> {
+        &self.navmesh
+    }
+}

src/autorouter/autorouter.rs

@@ -14,6 +14,7 @@ use thiserror::Error;
 
 use crate::{
     autorouter::{
+        autoroute::Autoroute,
         ratsnest::{Ratsnest, RatvertexIndex},
         selection::Selection,
     },
@@ -45,84 +46,9 @@ pub enum AutorouterStatus {
     Finished,
 }
 
-pub struct Autoroute {
-    ratlines_iter: Box<dyn Iterator<Item = EdgeIndex<usize>>>,
-    navmesh: Option<Navmesh>, // Useful for debugging.
-    cur_ratline: Option<EdgeIndex<usize>>,
-}
-
-impl Autoroute {
-    pub fn new(
-        ratlines: impl IntoIterator<Item = EdgeIndex<usize>> + 'static,
-        autorouter: &mut Autorouter<impl MesadataTrait>,
-    ) -> Result<Self, AutorouterError> {
-        let mut ratlines_iter = Box::new(ratlines.into_iter());
-
-        let Some(cur_ratline) = ratlines_iter.next() else {
-            return Err(AutorouterError::NothingToRoute);
-        };
-
-        let (source, target) = autorouter.ratline_endpoints(cur_ratline);
-        let navmesh = Some(Navmesh::new(autorouter.board.layout(), source, target)?);
-
-        let this = Self {
-            ratlines_iter,
-            navmesh,
-            cur_ratline: Some(cur_ratline),
-        };
-
-        Ok(this)
-    }
-
-    pub fn step<M: MesadataTrait>(
-        &mut self,
-        autorouter: &mut Autorouter<M>,
-        observer: &mut impl RouterObserverTrait<M>,
-    ) -> Result<AutorouterStatus, AutorouterError> {
-        let (new_navmesh, new_ratline) = if let Some(cur_ratline) = self.ratlines_iter.next() {
-            let (source, target) = autorouter.ratline_endpoints(cur_ratline);
-
-            (
-                Some(
-                    Navmesh::new(autorouter.board.layout(), source, target)
-                        .ok()
-                        .unwrap(),
-                ),
-                Some(cur_ratline),
-            )
-        } else {
-            (None, None)
-        };
-
-        match autorouter.board.route_band(
-            std::mem::replace(&mut self.navmesh, new_navmesh).unwrap(),
-            100.0,
-            observer,
-        ) {
-            Ok(band) => {
-                autorouter
-                    .ratsnest
-                    .assign_band_to_ratline(self.cur_ratline.unwrap(), band);
-                self.cur_ratline = new_ratline;
-
-                if self.navmesh.is_some() {
-                    Ok(AutorouterStatus::Running)
-                } else {
-                    Ok(AutorouterStatus::Finished)
-                }
-            }
-            Err(err) => Err(AutorouterError::Router(err)),
-        }
-    }
-
-    pub fn navmesh(&self) -> &Option<Navmesh> {
-        &self.navmesh
-    }
-}
-
 pub struct Autorouter<M: MesadataTrait> {
-    board: Board<M>,
+    pub(super) board: Board<M>,
-    ratsnest: Ratsnest,
+    pub(super) ratsnest: Ratsnest,
 }
 
 impl<M: MesadataTrait> Autorouter<M> {

src/autorouter/invoker.rs

@@ -3,12 +3,12 @@ use thiserror::Error;
 
 use crate::{
     autorouter::{
+        autoroute::Autoroute,
         history::{History, HistoryError},
         selection::Selection,
-        Autoroute, Autorouter, AutorouterError, AutorouterStatus,
+        Autorouter, AutorouterError, AutorouterStatus,
     },
     board::mesadata::MesadataTrait,
-    layout::Layout,
     router::{EmptyRouterObserver, RouterObserverTrait},
 };
 

src/autorouter/mod.rs

@@ -1,3 +1,4 @@
+pub mod autoroute;
 mod autorouter;
 pub mod history;
 pub mod invoker;