ecs: add id() -> str method

engine/src/render/renderable.rs

@@ -25,7 +25,11 @@ use crate::render::resource::{ResourceID};
 
 pub struct Transform(pub cgm::Matrix4<f32>);
 
-impl Component for Transform {}
+impl Component for Transform {
+    fn id(&self) -> &'static str {
+        "Transform"
+    }
+}
 
 impl Transform {
     pub fn at(x: f32, y: f32, z: f32) -> Self {
@@ -48,4 +52,8 @@ pub enum Renderable {
     Mesh(ResourceID<Mesh>, ResourceID<Material>),
 }
 
-impl Component for Renderable {}
+impl Component for Renderable {
+    fn id(&self) -> &'static str {
+        "Renderable"
+    }
+}

lib/ecs/BUILD

@@ -14,6 +14,9 @@ rust_library(
         "src/system.rs",
         "src/world.rs",
     ],
+    deps = [
+        "//third_party/cargo:log",
+    ],
     visibility = ["//engine:__subpackages__"],
 )
 

lib/ecs/src/component.rs

@@ -2,6 +2,9 @@ pub type ID = std::any::TypeId;
 
 
 pub trait Component: 'static {
+    fn id(&self) -> &'static str {
+        ""
+    }
 }
 
 pub fn component_id<T: Component>() -> ID {

lib/ecs/src/world.rs

@@ -159,7 +159,12 @@ impl World {
         c: Box<dyn component::Component>,
         e: entity::Entity
     ) {
-        let map = self.components.entry(cid).or_insert(ComponentMap::new());
+        let map = self.components.entry(cid).or_insert_with(|| {
+            if c.id() == "" {
+                log::warn!("Component type {:?} has no .id() defined, will not be accessible from scripting.", cid);
+            }
+            ComponentMap::new()
+        });
         map.insert(e.id(), c).unwrap();
     }