[bitboard] Move everything in board::bitboard to the bitboard crate

bitboard/src/bitboard.rs

@@ -1,8 +1,8 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use super::library::{library, FILES, RANKS};
+use crate::library::{library, FILES, RANKS};
-use super::LeadingBitScanner;
+use crate::LeadingBitScanner;
-use crate::{square::Direction, Square};
+use chess_core::{Direction, Square};
 use std::fmt;
 use std::ops::Not;
 
@@ -72,13 +72,13 @@ impl BitBoard {
     /// Return an Iterator over the occupied squares, starting from the leading
     /// (most-significant bit) end of the field.
     pub(crate) fn occupied_squares(&self) -> impl Iterator<Item = Square> {
-        LeadingBitScanner::new(self.0).map(Square::from_index)
+        LeadingBitScanner::new(self.0).map(|idx| unsafe { Square::from_index(idx as u8) })
     }
 
     /// Return an Iterator over the occupied squares, starting from the trailing
     /// (least-significant bit) end of the field.
     pub(crate) fn occupied_squares_trailing(&self) -> impl Iterator<Item = Square> {
-        LeadingBitScanner::new(self.0).map(Square::from_index)
+        LeadingBitScanner::new(self.0).map(|idx| unsafe { Square::from_index(idx as u8) })
     }
 }
 
@@ -243,7 +243,8 @@ impl BitBoardBuilder {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{bitboard, Square};
+    use crate::bitboard;
+    use chess_core::Square;
 
     #[test]
     fn display_and_debug() {

bitboard/src/lib.rs

@@ -1 +1,18 @@
 // Eryn Wells <eryn@erynwells.me>
+
+mod bit_scanner;
+mod bitboard;
+mod library;
+mod shifts;
+
+pub(crate) use bit_scanner::{LeadingBitScanner, TrailingBitScanner};
+pub(crate) use bitboard::{BitBoard, BitBoardBuilder};
+
+#[macro_export]
+macro_rules! bitboard {
+    ($($sq:ident),* $(,)?) => {
+        $crate::bitboard::BitBoardBuilder::empty()
+            $(.square(chess_core::Square::$sq))*
+            .build()
+    };
+}

bitboard/src/library.rs

@@ -1,7 +1,7 @@
 // Eryn Wells <eryn@erynwells.me>
 
 use super::BitBoard;
-use crate::{square::Direction, Square};
+use chess_core::{Direction, Square};
 use std::sync::Once;
 
 pub(super) const RANKS: [BitBoard; 8] = [

board/src/bitboard/mod.rs

@@ -1,16 +0,0 @@
-mod bit_scanner;
-mod bitboard;
-mod library;
-mod shifts;
-
-pub(crate) use bit_scanner::{LeadingBitScanner, TrailingBitScanner};
-pub(crate) use bitboard::{BitBoard, BitBoardBuilder};
-
-#[macro_export]
-macro_rules! bitboard {
-    ($($sq:ident),* $(,)?) => {
-        $crate::bitboard::BitBoardBuilder::empty()
-            $(.square($crate::Square::$sq))*
-            .build()
-    };
-}

board/src/lib.rs

@@ -2,8 +2,6 @@
 
 pub mod fen;
 
-#[macro_use]
-mod bitboard;
 mod display;
 mod r#move;
 #[macro_use]