Store level name in World.

examples/dyna/src/world.cpp

@@ -8,6 +8,7 @@ namespace dyna
 
 World::World( const std::string& level_fn, bool with_player )
     : map_( std::make_unique<Map>( level_fn ) )
+    , name_( level_fn.substr( level_fn.rfind( '/' ) + 1 ) )
 {
     if( with_player )
     {

examples/dyna/src/world.hpp

@@ -28,6 +28,7 @@ public:
     Map& map() { return *map_; }
     const Map& map() const { return *map_; }
     Player* player() { return player_.get(); }   // null on the menu screen
+    const std::string& name() const { return name_; }
 
     void tick();
     void draw();
@@ -39,6 +40,7 @@ public:
 private:
     std::unique_ptr<Map> map_;
     std::unique_ptr<Player> player_;
+    std::string name_;
 };
 
 }