[bitboard,core,position] Address a bunch of clippy warnings

bitboard/src/bit_scanner.rs

@@ -89,7 +89,7 @@ mod tests {
 
     #[test]
     fn leading_complex() {
-        let mut scanner = LeadingBitScanner::new(0b11000101);
+        let mut scanner = LeadingBitScanner::new(0b_1100_0101);
         assert_eq!(scanner.next(), Some(7));
         assert_eq!(scanner.next(), Some(6));
         assert_eq!(scanner.next(), Some(2));
@@ -112,7 +112,7 @@ mod tests {
 
     #[test]
     fn trailing_complex() {
-        let mut scanner = TrailingBitScanner::new(0b11000101);
+        let mut scanner = TrailingBitScanner::new(0b_1100_0101);
         assert_eq!(scanner.next(), Some(0));
         assert_eq!(scanner.next(), Some(2));
         assert_eq!(scanner.next(), Some(6));

bitboard/src/bitboard.rs

@@ -146,18 +146,23 @@ impl BitBoard {
 }
 
 impl BitBoard {
-    /// Return an Iterator over the occupied squares, starting from the leading
-    /// (most-significant bit) end of the field.
+    /// Returns an Iterator over the occupied squares.
+    ///
+    /// The Iterator yields squares starting from the leading (most-significant bit) end of the
+    /// board to the trailing (least-significant bit) end.
+    #[must_use]
     pub fn occupied_squares(&self) -> impl Iterator<Item = Square> {
         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.
+    #[must_use]
     pub fn occupied_squares_trailing(&self) -> impl Iterator<Item = Square> {
         TrailingBitScanner::new(self.0).map(|idx| unsafe { Square::from_index(idx as u8) })
     }
 
+    #[must_use]
     pub fn first_occupied_square(&self) -> Option<Square> {
         let leading_zeros = self.0.leading_zeros() as u8;
         if leading_zeros < Square::NUM as u8 {
@@ -167,6 +172,7 @@ impl BitBoard {
         }
     }
 
+    #[must_use]
     pub fn first_occupied_square_trailing(&self) -> Option<Square> {
         let trailing_zeros = self.0.trailing_zeros() as u8;
         if trailing_zeros < Square::NUM as u8 {

bitboard/src/library.rs

@@ -12,17 +12,21 @@ use crate::BitBoard;
 use chessfriend_core::{Color, Direction, Square};
 use std::sync::OnceLock;
 
+#[allow(clippy::identity_op)]
+#[allow(clippy::erasing_op)]
 pub(crate) const RANKS: [BitBoard; 8] = [
-    BitBoard(0xFF << 0 * 8),
-    BitBoard(0xFF << 1 * 8),
-    BitBoard(0xFF << 2 * 8),
-    BitBoard(0xFF << 3 * 8),
-    BitBoard(0xFF << 4 * 8),
-    BitBoard(0xFF << 5 * 8),
-    BitBoard(0xFF << 6 * 8),
-    BitBoard(0xFF << 7 * 8),
+    BitBoard(0xFF << (0 * 8)),
+    BitBoard(0xFF << (1 * 8)),
+    BitBoard(0xFF << (2 * 8)),
+    BitBoard(0xFF << (3 * 8)),
+    BitBoard(0xFF << (4 * 8)),
+    BitBoard(0xFF << (5 * 8)),
+    BitBoard(0xFF << (6 * 8)),
+    BitBoard(0xFF << (7 * 8)),
 ];
 
+#[allow(clippy::identity_op)]
+#[allow(clippy::erasing_op)]
 pub(crate) const FILES: [BitBoard; 8] = [
     BitBoard(0x0101010101010101 << 0),
     BitBoard(0x0101010101010101 << 1),

core/src/colors.rs

@@ -3,8 +3,9 @@
 use crate::{errors::TryFromCharError, try_from_string};
 use std::fmt;
 
-#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
 pub enum Color {
+    #[default]
     White = 0,
     Black = 1,
 }
@@ -16,7 +17,9 @@ impl Color {
         Color::ALL.iter()
     }
 
-    pub fn other(&self) -> Color {
+    /// The other color
+    #[must_use]
+    pub const fn other(&self) -> Color {
         match self {
             Color::White => Color::Black,
             Color::Black => Color::White,
@@ -24,12 +27,6 @@ impl Color {
     }
 }
 
-impl Default for Color {
-    fn default() -> Self {
-        Color::White
-    }
-}
-
 impl fmt::Display for Color {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(

core/src/pieces.rs

@@ -34,7 +34,7 @@ impl Shape {
         PROMOTABLE_SHAPES.iter()
     }
 
-    const fn to_ascii(&self) -> char {
+    const fn to_ascii(self) -> char {
         match self {
             Shape::Pawn => 'P',
             Shape::Knight => 'N',
@@ -79,7 +79,7 @@ impl Into<char> for Shape {
 impl fmt::Display for Shape {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let self_char: char = self.into();
-        write!(f, "{}", self_char)
+        write!(f, "{self_char}")
     }
 }
 
@@ -91,6 +91,7 @@ pub struct Piece {
 
 macro_rules! piece_constructor {
     ($func_name:ident, $type:tt) => {
+        #[must_use]
         pub fn $func_name(color: Color) -> Piece {
             Piece {
                 color,
@@ -102,6 +103,7 @@ macro_rules! piece_constructor {
 
 macro_rules! is_shape {
     ($func_name:ident, $shape:ident) => {
+        #[must_use]
         pub fn $func_name(&self) -> bool {
             self.shape == Shape::$shape
         }
@@ -109,6 +111,7 @@ macro_rules! is_shape {
 }
 
 impl Piece {
+    #[must_use]
     pub fn new(color: Color, shape: Shape) -> Piece {
         Piece { color, shape }
     }
@@ -120,10 +123,12 @@ impl Piece {
     piece_constructor!(queen, Queen);
     piece_constructor!(king, King);
 
+    #[must_use]
     pub fn color(&self) -> Color {
         self.color
     }
 
+    #[must_use]
     pub fn shape(&self) -> Shape {
         self.shape
     }
@@ -135,7 +140,8 @@ impl Piece {
     is_shape!(is_queen, Queen);
     is_shape!(is_king, King);
 
-    pub fn to_ascii(&self) -> char {
+    #[must_use]
+    pub fn to_ascii(self) -> char {
         let ch = self.shape.to_ascii();
         match self.color {
             Color::White => ch,
@@ -143,7 +149,8 @@ impl Piece {
         }
     }
 
-    fn to_unicode(&self) -> char {
+    #[must_use]
+    fn to_unicode(self) -> char {
         match (self.color, self.shape) {
             (Color::Black, Shape::Pawn) => '♟',
             (Color::Black, Shape::Knight) => '♞',
@@ -175,6 +182,7 @@ pub struct PlacedPiece {
 
 macro_rules! is_shape {
     ($func_name:ident, $shape:ident) => {
+        #[must_use]
         pub fn $func_name(&self) -> bool {
             self.piece().shape == Shape::$shape
         }
@@ -182,26 +190,35 @@ macro_rules! is_shape {
 }
 
 impl PlacedPiece {
+    #[must_use]
     pub const fn new(piece: Piece, square: Square) -> PlacedPiece {
         PlacedPiece { piece, square }
     }
 
+    /// The [Piece] itself
     #[inline]
+    #[must_use]
     pub fn piece(&self) -> &Piece {
         &self.piece
     }
 
+    /// The square the piece is on
     #[inline]
+    #[must_use]
     pub fn square(&self) -> Square {
         self.square
     }
 
+    /// The piece's [Color]
     #[inline]
+    #[must_use]
     pub fn color(&self) -> Color {
         self.piece.color
     }
 
+    /// The piece's [Shape]
     #[inline]
+    #[must_use]
     pub fn shape(&self) -> Shape {
         self.piece.shape
     }
@@ -213,6 +230,7 @@ impl PlacedPiece {
     is_shape!(is_queen, Queen);
     is_shape!(is_king, King);
 
+    #[must_use]
     pub fn is_kingside_rook(&self) -> bool {
         self.is_rook()
             && match self.color() {
@@ -221,6 +239,7 @@ impl PlacedPiece {
             }
     }
 
+    #[must_use]
     pub fn is_queenside_rook(&self) -> bool {
         self.is_rook()
             && match self.color() {

position/src/check.rs

@@ -1,10 +1,9 @@
 // Eryn Wells <eryn@erynwells.me>
 
+use crate::sight::SliderRayToSquareExt;
 use chessfriend_bitboard::BitBoard;
 use chessfriend_core::Shape;
 
-use crate::sight::SliderRayToSquareExt;
-
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct CheckingPieces {
     bitboards: [BitBoard; 5],
@@ -23,12 +22,12 @@ impl CheckingPieces {
         }
     }
 
+    /// The number of checking pieces.
     pub fn count(&self) -> u32 {
         self.bitboards.iter().map(BitBoard::population_count).sum()
     }
 
-    /// A BitBoard representing the set of pieces that must be captured to
-    /// resolve check.
+    /// A BitBoard representing the set of pieces that must be captured to resolve check.
     pub fn capture_mask(&self) -> BitBoard {
         if self.count() == 0 {
             BitBoard::FULL
@@ -39,8 +38,8 @@ impl CheckingPieces {
         }
     }
 
-    /// A BitBoard representing the set of squares to which a player can move a
-    /// piece to block a checking piece.
+    /// A BitBoard representing the set of squares to which a player can move a piece to block a
+    /// checking piece.
     pub fn push_mask(&self, king: &BitBoard) -> BitBoard {
         let target = king.first_occupied_square().unwrap();
 

position/src/position/piece_sets.rs

@@ -78,7 +78,7 @@ impl PieceBitBoards {
     }
 
     pub(super) fn place_piece(&mut self, piece: &PlacedPiece) -> Result<(), PlacePieceError> {
-        self.place_piece_with_strategy(piece, Default::default())
+        self.place_piece_with_strategy(piece, PlacePieceStrategy::default())
     }
 
     pub(super) fn place_piece_with_strategy(

position/src/position/position.rs

@@ -138,22 +138,27 @@ impl Position {
         })
     }
 
-    /// Return a BitBoard representing the set of squares containing a piece.
+    /// A [BitBoard] representing the set of squares containing a piece.
     #[inline]
+    #[must_use]
     pub(crate) fn occupied_squares(&self) -> &BitBoard {
         &self.pieces.all_pieces()
     }
 
     #[inline]
+    #[must_use]
     pub(crate) fn friendly_pieces(&self) -> &BitBoard {
         self.pieces.all_pieces_of_color(self.color_to_move)
     }
 
     #[inline]
+    #[must_use]
     pub(crate) fn opposing_pieces(&self) -> &BitBoard {
         self.pieces.all_pieces_of_color(self.color_to_move.other())
     }
 
+    #[inline]
+    #[must_use]
     pub(crate) fn all_pieces(&self) -> (&BitBoard, &BitBoard) {
         (self.friendly_pieces(), self.opposing_pieces())
     }
@@ -161,6 +166,7 @@ impl Position {
     /// Return a BitBoard representing the set of squares containing a piece.
     /// This set is the inverse of `occupied_squares`.
     #[inline]
+    #[must_use]
     pub(crate) fn empty_squares(&self) -> BitBoard {
         !self.occupied_squares()
     }