https://git.spwbk.site/swatson/rs-rl/raw/master/src/map_indexing_system.rs
___________________________________
use specs::prelude::*;
use super::{Map, Position, BlocksTile};

pub struct MapIndexingSystem {}

impl<'a> System<'a> for MapIndexingSystem {
   type SystemData = ( WriteExpect<'a, Map>,
                       ReadStorage<'a, Position>,
                       ReadStorage<'a, BlocksTile>,
                       Entities<'a>,);

   fn run(&mut self, data : Self::SystemData) {
       let (mut map, position, blockers, entities) = data;

       map.populate_blocked();
       map.clear_content_index();
       for (entity, position) in (&entities, &position).join() {
           let idx = map.xy_idx(position.x, position.y);

           // If they block, update the blocking list
           let _p : Option<&BlocksTile> = blockers.get(entity);
           if let Some(_p) = _p {
               map.blocked[idx] = true;
           }

           // Push the entity to the appropriate index slot. It's a Copy
           // type, so we don't need to clone it (we want to avoid moving it out of the ECS!)
           map.tile_content[idx].push(entity);
       }
   }
}

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