WIP

moves/src/defs.rs

@@ -2,6 +2,7 @@
 
 use chessfriend_core::Shape;
 
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub(crate) enum Kind {
     Quiet = 0b0000,
     DoublePush = 0b0001,
@@ -13,6 +14,12 @@ pub(crate) enum Kind {
     CapturePromotion = 0b1100,
 }
 
+impl Kind {
+    fn is_reversible(self) -> bool {
+        (self as u16) & 0b1100 == 0
+    }
+}
+
 #[repr(u16)]
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum PromotionShape {
@@ -32,3 +39,17 @@ impl From<PromotionShape> for Shape {
         }
     }
 }
+
+impl TryFrom<Shape> for PromotionShape {
+    type Error = ();
+
+    fn try_from(value: Shape) -> Result<Self, Self::Error> {
+        match value {
+            Shape::Knight => Ok(PromotionShape::Knight),
+            Shape::Bishop => Ok(PromotionShape::Bishop),
+            Shape::Rook => Ok(PromotionShape::Rook),
+            Shape::Queen => Ok(PromotionShape::Queen),
+            _ => Err(()),
+        }
+    }
+}