feat(specctra-core/mesadata, layout): make `Layout` clonable

This change also propagates to `SpecctraMesadata`, which is a bit unfortunate,
because the code that needs this will never mutate the mesadata,
wrapping it in an `Arc` would be a possible alternative.

crates/specctra-core/src/mesadata.rs

@@ -37,7 +37,7 @@ pub trait AccessMesadata: AccessRules {
     fn netname_net(&self, netname: &str) -> Option<usize>;
 }
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 /// [`SpecctraRule`] represents the basic routing constraints used by an auto-router, such as
 /// the Topola auto-router, in a PCB design process. This struct defines two key design
 /// rules: the width of the trace and the minimum clearance between electrical features.
@@ -62,7 +62,7 @@ impl SpecctraRule {
     }
 }
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 /// [`SpecctraMesadata`] holds the metadata required by the Specctra auto-router to
 /// understand and enforce design rules across various net classes and layers in a PCB layout.
 /// This struct encapsulates information about rules for individual nets, net classes,

src/drawing/drawing.rs

@@ -102,7 +102,7 @@ pub type DrawingEdit<CW> = GeometryEdit<
     BendIndex,
 >;
 
-#[derive(Debug, Getters)]
+#[derive(Clone, Debug, Getters)]
 pub struct Drawing<CW, R> {
     recording_geometry_with_rtree: RecordingGeometryWithRtree<
         PrimitiveWeight,

src/geometry/geometry.rs

@@ -97,6 +97,17 @@ pub struct Geometry<PW, DW, SW, BW, CW, PI, DI, SI, BI> {
     bend_index_marker: PhantomData<BI>,
 }
 
+impl<PW: Clone, DW, SW, BW, CW: Clone, PI, DI, SI, BI> Clone
+    for Geometry<PW, DW, SW, BW, CW, PI, DI, SI, BI>
+{
+    fn clone(&self) -> Self {
+        Self {
+            graph: self.graph.clone(),
+            ..Self::new()
+        }
+    }
+}
+
 impl<PW, DW, SW, BW, CW, PI, DI, SI, BI> Default for Geometry<PW, DW, SW, BW, CW, PI, DI, SI, BI> {
     fn default() -> Self {
         Self::new()

src/geometry/recording_with_rtree.rs

@@ -23,6 +23,16 @@ pub struct RecordingGeometryWithRtree<PW, DW, SW, BW, CW, PI, DI, SI, BI> {
     geometry_with_rtree: GeometryWithRtree<PW, DW, SW, BW, CW, PI, DI, SI, BI>,
 }
 
+impl<PW: Clone, DW, SW, BW, CW: Clone, PI: Clone, DI, SI, BI> Clone
+    for RecordingGeometryWithRtree<PW, DW, SW, BW, CW, PI, DI, SI, BI>
+{
+    fn clone(&self) -> Self {
+        Self {
+            geometry_with_rtree: self.geometry_with_rtree.clone(),
+        }
+    }
+}
+
 impl<
         PW: GetWidth + GetLayer + TryInto<DW> + TryInto<SW> + TryInto<BW> + Retag<Index = PI> + Copy,
         DW: AccessDotWeight + Into<PW> + GetLayer,

src/geometry/with_rtree.rs

@@ -45,6 +45,18 @@ pub struct GeometryWithRtree<PW, DW, SW, BW, CW, PI, DI, SI, BI> {
     layer_count: usize,
 }
 
+impl<PW: Clone, DW, SW, BW, CW: Clone, PI: Clone, DI, SI, BI> Clone
+    for GeometryWithRtree<PW, DW, SW, BW, CW, PI, DI, SI, BI>
+{
+    fn clone(&self) -> Self {
+        Self {
+            geometry: self.geometry.clone(),
+            rtree: self.rtree.clone(),
+            layer_count: self.layer_count,
+        }
+    }
+}
+
 #[debug_invariant(self.test_envelopes())]
 #[debug_invariant(self.geometry.graph().node_count() == self.rtree.size())]
 impl<

src/layout/layout.rs

@@ -56,7 +56,7 @@ pub enum CompoundWeight {
 pub type NodeIndex = GenericNode<PrimitiveIndex, GenericIndex<CompoundWeight>>;
 pub type LayoutEdit = DrawingEdit<CompoundWeight>;
 
-#[derive(Debug, Getters)]
+#[derive(Clone, Debug, Getters)]
 /// Structure for managing the Layout design
 pub struct Layout<R> {
     drawing: Drawing<CompoundWeight, R>,