WIP

Makefile

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+
+
+all:
+	cargo build

position/src/sight/rays.rs

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+// Eryn Wells <eryn@erynwells.me>
+
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::{Direction, Square};
+
+fn _find_ray_connecting_squares(origin_square: Square, target_square: Square) -> BitBoard {
+    macro_rules! ray {
+        ($square:expr, $direction:expr) => {
+            ($direction, BitBoard::ray($square, $direction))
+        };
+    }
+
+    let target: BitBoard = target_square.into();
+    match Direction::ALL
+        .iter()
+        .map(|direction| ray!(origin_square, *direction))
+        .find(|(direction, &ray)| (ray & target).is_populated())
+    {
+        Some((direction, ray)) => {
+            if let Some(first_occupied_square) = BitBoard::$occupied_squares(&(ray & $blockers)).next()
+            let remainder = BitBoard::ray(first_occupied_square, direction);
+            let attack_ray = ray & !remainder;
+            attack_ray * ray
+        }
+        None => BitBoard::EMPTY,
+    }
+}