fix entities not being despawned

closes #103

azalea-client/src/packet_handling.rs

@@ -830,6 +830,33 @@ pub fn process_packet_events(ecs: &mut World) {
             }
             ClientboundGamePacket::RemoveEntities(p) => {
                 debug!("Got remove entities packet {:?}", p);
+
+                let mut system_state: SystemState<(
+                    Commands,
+                    Query<&mut InstanceName>,
+                    Res<InstanceContainer>,
+                )> = SystemState::new(ecs);
+
+                let (mut commands, mut query, instance_container) = system_state.get_mut(ecs);
+                let Ok(instance_name) = query.get_mut(player_entity) else {
+                    println!("no instance name");
+                    continue;
+                };
+
+                let Some(instance) = instance_container.get(&instance_name) else {
+                    println!("no instance");
+                    continue;
+                };
+                for &id in &p.entity_ids {
+                    if let Some(entity) =
+                        instance.write().entity_by_id.remove(&MinecraftEntityId(id))
+                    {
+                        println!("despawning entity");
+                        commands.entity(entity).despawn();
+                    }
+                }
+
+                system_state.apply(ecs);
             }
             ClientboundGamePacket::PlayerChat(p) => {
                 debug!("Got player chat packet {:?}", p);

azalea/examples/nearest_entity.rs

@@ -64,10 +64,7 @@ fn log_nearby_item_drops(
             let item_drop = item_drops.get(entity).unwrap();
             let kind = item_drop.kind();
 
-            println!(
+            println!("Bot {bot_id:?} can see an {kind:?} {distance:.1} meters away.");
-                "Bot {:?} can see an {:?} {:.1} meters away.",
-                bot_id, kind, distance
-            );
         }
     }
 }