Beginning the conversion to an Effects system

src/spatial/map_indexing_system.rs

@@ -0,0 +1,33 @@
+use crate::{spatial, BlocksTile, Map, Pools, Position};
+use specs::prelude::*;
+
+pub struct MapIndexingSystem {}
+
+impl<'a> System<'a> for MapIndexingSystem {
+    type SystemData = (
+        ReadExpect<'a, Map>,
+        ReadStorage<'a, Position>,
+        ReadStorage<'a, BlocksTile>,
+        Entities<'a>,
+        ReadStorage<'a, Pools>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (map, position, blockers, entities, pools) = data;
+
+        spatial::clear();
+        spatial::populate_blocked_from_map(&*map);
+        for (entity, position) in (&entities, &position).join() {
+            let mut alive = true;
+            if let Some(pools) = pools.get(entity) {
+                if pools.hit_points.current < 1 {
+                    alive = false;
+                }
+            }
+            if alive {
+                let idx = map.xy_idx(position.x, position.y);
+                spatial::index_entity(entity, idx, blockers.get(entity).is_some());
+            }
+        }
+    }
+}

src/spatial/mod.rs

@@ -2,6 +2,9 @@ use crate::{tile_walkable, Map, RunState};
 use specs::prelude::*;
 use std::sync::Mutex;
 
+mod map_indexing_system;
+pub use map_indexing_system::MapIndexingSystem;
+
 struct SpatialMap {
     blocked: Vec<(bool, bool)>,
     tile_content: Vec<Vec<(Entity, bool)>>,