feat(direction): init, Direction4, turn_{left,right}

Author: ada4a

src/direction.rs

@@ -0,0 +1,26 @@
+pub enum Direction4 {
+    Up,
+    Right,
+    Down,
+    Left,
+}
+
+impl Direction4 {
+    pub fn turn_right(self) -> Self {
+        match self {
+            Self::Up => Self::Right,
+            Self::Right => Self::Down,
+            Self::Down => Self::Left,
+            Self::Left => Self::Up,
+        }
+    }
+
+    pub fn turn_left(self) -> Self {
+        match self {
+            Self::Up => Self::Left,
+            Self::Left => Self::Down,
+            Self::Down => Self::Right,
+            Self::Right => Self::Up,
+        }
+    }
+}

src/lib.rs

@@ -1,4 +1,5 @@
 #[macro_use]
 pub mod parse;
+pub mod direction;
 pub mod map;
 pub mod points;