create /removelights command

server/src/cmd.rs

@@ -220,6 +220,13 @@ lazy_static! {
              true,
              handle_exp,
          ),
+        ChatCommand::new(
+             "removelights",
+             "{}",
+             "/removelights [radius] : Removes all lights spawned by players",
+             true,
+             handle_remove_lights,
+         ),
     ];
 }
 
@@ -953,3 +960,50 @@ fn handle_exp(server: &mut Server, entity: EcsEntity, args: String, action: &Cha
         }
     }
 }
+
+fn handle_remove_lights(server: &mut Server, entity: EcsEntity, args: String, action: &ChatCommand) {
+    let opt_radius = scan_fmt_some!(&args, action.arg_fmt, f32);
+    let opt_player_pos = server.state.read_component_cloned::<comp::Pos>(entity); 
+    let mut to_delete = vec![];
+
+    match opt_player_pos {
+        Some(player_pos) => {
+            let ecs = server.state.ecs();
+            let entities = &ecs.entities();
+            let light_emitters = &ecs.read_storage::<comp::LightEmitter>();
+            let lights = (entities, light_emitters).join();
+            for (entity, _) in lights {
+                let pos = ecs
+                    .read_storage::<comp::Pos>()
+                    .get(entity)
+                    .copied();
+                if let Some(pos) = pos {
+                    if opt_radius.is_some() {
+                        if pos.0.distance(player_pos.0) < opt_radius.unwrap() {
+                            to_delete.push(entity);
+                        }
+                    } else {
+                        to_delete.push(entity);
+                    }
+                }
+            }
+        },
+        None => server.clients.notify(
+                entity,
+                ServerMsg::private(String::from("You have no position.")),
+        ),
+    }
+
+    let size = to_delete.len();
+
+    for entity in to_delete.iter() {
+        let _ = server.state.ecs_mut().delete_entity_synced(*entity);
+    }
+
+    server.clients.notify(
+        entity, 
+        ServerMsg::private(String::from(
+            format!("Removed {} lights!", size)
+        )),
+    );
+}