feat: keycode to direction utility function

src/direction.rs

@@ -1,3 +1,5 @@
+use sdl2::keyboard::Keycode;
+
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub enum Direction {
     Up,
@@ -24,4 +26,18 @@ impl Direction {
             Direction::Up => (0, -1),
         }
     }
+
+    pub fn from_keycode(keycode: Keycode) -> Option<Direction> {
+        match keycode {
+            Keycode::D => Some(Direction::Right),
+            Keycode::Right => Some(Direction::Right),
+            Keycode::A => Some(Direction::Left),
+            Keycode::Left => Some(Direction::Left),
+            Keycode::W => Some(Direction::Up),
+            Keycode::Up => Some(Direction::Up),
+            Keycode::S => Some(Direction::Down),
+            Keycode::Down => Some(Direction::Down),
+            _ => None,
+        }
+    }
 }