[explorer, position] Make Position.board private to the crate

Export a Position::board() method that returns a reference to the internal Board.

explorer/src/main.rs

@@ -187,7 +187,7 @@ fn respond(line: &str, state: &mut State) -> anyhow::Result<CommandResult> {
 }
 
 fn do_flags_command(state: &mut State, _matches: &clap::ArgMatches) -> CommandResult {
-    let board = &state.position.board;
+    let board = state.position.board();
 
     println!("Castling:");
 
@@ -390,7 +390,7 @@ fn main() -> Result<(), String> {
     loop {
         if should_print_position {
             println!("{}", &state.position);
-            println!("{} to move.", state.position.board.active_color());
+            println!("{} to move.", state.position.active_color());
         }
 
         let readline = editor.readline("\n? ");

position/src/position.rs

@@ -24,7 +24,7 @@ use std::{collections::HashSet, fmt, sync::Arc};
 #[must_use]
 #[derive(Clone, Debug, Default, Eq)]
 pub struct Position {
-    pub board: Board,
+    pub(crate) board: Board,
     pub(crate) moves: Vec<MoveRecord>,
     pub(crate) captures: CapturesList,
 
@@ -48,6 +48,11 @@ impl Position {
             ..Default::default()
         }
     }
+
+    #[must_use]
+    pub fn board(&self) -> &Board {
+        &self.board
+    }
 }
 
 impl Position {

position/tests/peterellisjones.rs

@@ -8,7 +8,7 @@
 
 use chessfriend_core::Color;
 use chessfriend_moves::{
-    assert_move_list, assert_move_list_contains, assert_move_list_does_not_contain, ply, Move,
+    Move, assert_move_list, assert_move_list_contains, assert_move_list_does_not_contain, ply,
 };
 use chessfriend_position::test_position;
 use std::collections::HashSet;
@@ -107,7 +107,7 @@ fn en_passant_check_capture() {
         White Pawn on D4,
     ], D3);
 
-    assert!(pos.board.active_color_is_in_check());
+    assert!(pos.board().active_color_is_in_check());
 
     let generated_moves: HashSet<_> = pos.all_legal_moves(Some(Color::Black)).collect();
 
@@ -123,7 +123,7 @@ fn en_passant_check_block() {
         White Queen on F1,
     ], D3);
 
-    assert!(pos.board.active_color_is_in_check());
+    assert!(pos.board().active_color_is_in_check());
 
     let generated_moves: HashSet<_> = pos.all_legal_moves(Some(Color::Black)).collect();
 
@@ -139,7 +139,7 @@ fn pinned_pieces_rook_cannot_move_out_of_pin() {
         White King on C1,
     ]);
 
-    assert!(!pos.board.active_color_is_in_check());
+    assert!(!pos.board().active_color_is_in_check());
 
     let rook_moves: HashSet<_> = pos.all_legal_moves(None).collect();