Connect nodes with ports.

Show ports in dot file.

src/light.rs

@@ -31,12 +31,29 @@ mod test {
     #[test]
     fn new() {
         let light = Light::new("test1", "test2");
-        assert_eq!(light.src_port, "test1".to_owned());
-        assert_eq!(light.target_port, "test2".to_owned());
+        assert_eq!(light.src_port, "test1");
+        assert_eq!(light.target_port, "test2");
     }
     #[test]
     fn src_port() {
         let light = Light::new("test1", "test2");
-        assert_eq!(light.src_port(), "test1".to_owned());
+        assert_eq!(light.src_port(), "test1");
+    }
+    #[test]
+    fn target_port() {
+        let light = Light::new("test1", "test2");
+        assert_eq!(light.target_port(), "test2");
+    }
+    #[test]
+    fn set_src_port() {
+        let mut light = Light::new("test1", "test2");
+        light.set_src_port("test3".into());
+        assert_eq!(light.src_port, "test3");
+    }
+    #[test]
+    fn set_target_port() {
+        let mut light = Light::new("test1", "test2");
+        light.set_target_port("test3".into());
+        assert_eq!(light.target_port, "test3");
     }
 }

src/optic_scenery.rs

@@ -126,11 +126,14 @@ impl OpticScenery {
             dot_string += &node.to_dot(&format!("i{}", node_idx.index()));
         }
         for edge in self.g.edge_indices() {
+            let light=self.g.edge_weight(edge).unwrap();
             let end_nodes = self.g.edge_endpoints(edge).unwrap();
             dot_string.push_str(&format!(
-                "  i{} -> i{}\n",
+                "  i{} -> i{} [label=\"{}->{}\"]\n",
                 end_nodes.0.index(),
-                end_nodes.1.index()
+                end_nodes.1.index(),
+                light.src_port(),
+                light.target_port()
             ));
         }
         dot_string += "}";