Added an automatic `Solve' feature to most games. This is useful for

various things:
 - if you haven't fully understood what a game is about, it gives
   you an immediate example of a puzzle plus its solution so you can
   understand it
 - in some games it's useful to compare your solution with the real
   one and see where you made a mistake
 - in the rearrangement games (Fifteen, Sixteen, Twiddle) it's handy
   to be able to get your hands on a pristine grid quickly so you
   can practise or experiment with manoeuvres on it
 - it provides a good way of debugging the games if you think you've
   encountered an unsolvable grid!

[originally from svn r5731]

1 files changed, 8 insertions, 1 deletions

diff --git a/nullgame.c b/nullgame.c
index 296e76e..6eb427c 100644
--- a/nullgame.c
+++ b/nullgame.c
@@ -94,7 +94,7 @@ static char *new_game_seed(game_params *params, random_state *rs,
     return dupstr("FIXME");
 }
 
-void game_free_aux_info(game_aux_info *aux)
+static void game_free_aux_info(game_aux_info *aux)
 {
     assert(!"Shouldn't happen");
 }
@@ -127,6 +127,12 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
+static game_state *solve_game(game_state *state, game_aux_info *aux,
+			      char **error)
+{
+    return NULL;
+}
+
 static char *game_text_format(game_state *state)
 {
     return NULL;
@@ -234,6 +240,7 @@ const struct game thegame = {
     new_game,
     dup_game,
     free_game,
+    FALSE, solve_game,
     FALSE, game_text_format,
     new_ui,
     free_ui,