Add new method board.generate_all_moves

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    chess (0.3.6)
+    chess (0.4.0)
 
 GEM
   remote: http://rubygems.org/

README.md

@@ -34,7 +34,7 @@ end
 puts g.status
 ```
 
-**Documentation** is available **[here](http://pioz.github.io/chess)**.
+📚 **Documentation** is available [here](https://pioz.github.io/chess).
 
 ## Questions or problems?
 
@@ -44,5 +44,5 @@ pull request.
 
 ## Copyright
 
-Copyright (c) 2021 [Enrico Pilotto (@pioz)](https://github.com/pioz). See
+Copyright (c) 2024 [Enrico Pilotto (@pioz)](https://github.com/pioz). See
 [LICENSE](https://github.com/pioz/chess/blob/master/LICENSE) for details.

ext/chess/chess.c

@@ -640,6 +640,38 @@ board_generate_moves (VALUE self, VALUE square)
   return moves;
 }
 
+/*
+ * @overload generate_all_moves
+ *   Generate all legal moves for the current board position.
+ *   @return [Array<String>] Returns all legal moves that can be performed
+ *     in the current board position. The moves are in short algebraic chess
+ *     notation format.
+ *   @example
+ *     :001 > g = Chess::Game.new
+ *      => #<Chess::Game:0x007f88a529fa88>
+ *     :002 > g.board.generate_all_moves
+ *      => ["Na3", "Nc3", "Nf3", "Nh3", "a3", "a4", "b3", "b4", "c3", "c4", "d3", "d4", "e3", "e4", "f3", "f4", "g3", "g4", "h3", "h4"]
+ */
+VALUE
+board_generate_all_moves (VALUE self)
+{
+  Board *board;
+  Data_Get_Struct (self, Board, board);
+  VALUE moves = rb_ary_new ();
+  Board new_board;
+  char *move_done;
+  char capture;
+  for (int i = 0; i < 64; i++)
+    for (int j = 0; j < 64; j++)
+      if (pseudo_legal_move (board, i, j))
+        {
+          move_done = castling (board, castling_type (board, i, j), &new_board);
+          if (move_done || try_move (board, i, j, 'Q', &new_board, &move_done, &capture))
+            rb_ary_push (moves, rb_str_new2 (move_done));
+        }
+  return moves;
+}
+
 /*
  * @overload to_fen
  *   Returns the FEN string of the board.
@@ -729,6 +761,7 @@ Init_chess ()
   rb_define_method (board_klass, "halfmove_clock", board_halfmove_clock, 0);
   rb_define_method (board_klass, "fullmove_number", board_fullmove_number, 0);
   rb_define_method (board_klass, "generate_moves", board_generate_moves, 1);
+  rb_define_method (board_klass, "generate_all_moves", board_generate_all_moves, 0);
   rb_define_method (board_klass, "to_fen", board_to_fen, 0);
   rb_define_method (board_klass, "to_s", board_to_s, 0);
 

ext/chess/chess.h

@@ -42,6 +42,7 @@ VALUE board_active_color (VALUE self);
 VALUE board_halfmove_clock (VALUE self);
 VALUE board_fullmove_number (VALUE self);
 VALUE board_generate_moves (VALUE self, VALUE square);
+VALUE board_generate_all_moves (VALUE self);
 VALUE board_to_fen (VALUE self);
 VALUE board_to_s (VALUE self);
 

lib/chess/version.rb

@@ -1,5 +1,5 @@
 # The Chess library module.
 module Chess
   # The library version.
-  VERSION = '0.3.6'.freeze
+  VERSION = '0.4.0'.freeze
 end

test/test_move_generator.rb

@@ -27,6 +27,13 @@ class ChessTest < Minitest::Test
     end
   end
 
+  def test_generate_all_moves
+    game = Chess::Game.new
+    result = game.board.generate_all_moves
+
+    assert_equal %w[Na3 Nc3 Nf3 Nh3 a3 a4 b3 b4 c3 c4 d3 d4 e3 e4 f3 f4 g3 g4 h3 h4], result
+  end
+
   def test_github_issue32
     game = Chess::Game.new
     game.moves = %w[f2f4 d7d6 d2d3 h7h5 b1d2 e7e5 f4f5 a7a5 c2c3 d8f6 d2c4 b7b6 c4d2 a8a6 d2f3 a6a7 f3e5 b6b5 h2h4]