Now you can heal yourself.

systems.cpp

@@ -590,3 +590,30 @@ void System::render_map(Matrix& tiles, EntityGrid& entity_map, sf::RenderTexture
 
   render.display();
 }
+
+bool System::use_item(GameLevel& level, Entity what) {
+  auto& world = *level.world;
+  auto& inventory = world.get<inventory::Model>(level.player);
+  auto& player_combat = world.get<Combat>(level.player);
+
+  if(player_combat.hp >= player_combat.max_hp) return false;
+
+  if(auto curative = world.get_if<Curative>(what)) {
+    inventory.remove(what);
+
+    player_combat.hp += curative->hp;
+
+    if(player_combat.hp > player_combat.max_hp) {
+      player_combat.hp = player_combat.max_hp;
+    }
+
+    dbc::log(fmt::format("player health now {}",
+          player_combat.hp));
+
+    world.remove<Curative>(what);
+    return true;
+  } else {
+    dbc::log(fmt::format("no usable item at {}", what));
+    return false;
+  }
+}