Add a debug mode to make the game stupidly easy.

Implement an alternate version of game_reset, selectable by editing
the code, which always produces games that are winnable in just one
move.

This makes it much faster to manually test behaviour after game end.

diff --git a/src/game.c b/src/game.c
index 2ad3a7ed083b885cfddbc3c372b5865bbc72f67b..4946f8d137bd3679316025ba1890864de01ed508 100644 (file)
--- a/src/game.c
+++ b/src/game.c
@@ -168,6 +168,33 @@ void game_reset(struct board *board)
                        board->y = y;
                }
        }
+
+/* Uncomment to make every game stupidly easy -- winnable in 1 move */
+#if 0
+       /* Force empty space to the border */
+       if (board_position(board->x, board->y) & GOAL_MASK) {
+               switch (rng_uniform_int(4)) {
+               case 0: game_do_move(board, board->x, 0); break;
+               case 1: game_do_move(board, board->x, 4); break;
+               case 2: game_do_move(board, 0, board->y); break;
+               case 3: game_do_move(board, 4, board->y); break;
+               }
+       }
+
+       /* Force goal to match the current board */
+       for (i = 0; i < 3; i++) {
+               board->goal[i] = (board->game[i] & GOAL_MASK) >> GOAL_SHIFT;
+       }
+
+       /* Move empty space back to the centre */
+       if (board->x == 0 || board->x == 4) {
+               game_do_move(board, 1+rng_uniform_int(3), board->y);
+       }
+
+       if (board->y == 0 || board->y == 4) {
+               game_do_move(board, board->x, 1+rng_uniform_int(3));
+       }
+#endif
 }
 
 uint_fast32_t game_do_move(struct board *board, int x, int y)