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

[sgt/puzzles] / midend.c

diff --git a/midend.c b/midend.c
index efe8111..084cd16 100644 (file)
--- a/midend.c
+++ b/midend.c
@@ -17,6 +17,7 @@ struct midend_data {
     const game *ourgame;
 
     char *seed;
+    game_aux_info *aux_info;
     int fresh_seed;
     int nstates, statesize, statepos;
 
@@ -58,6 +59,7 @@ midend_data *midend_new(frontend *fe, const game *ourgame)
     me->states = NULL;
     me->params = ourgame->default_params();
     me->seed = NULL;
+    me->aux_info = NULL;
     me->fresh_seed = FALSE;
     me->drawstate = NULL;
     me->oldstate = NULL;
@@ -79,6 +81,8 @@ void midend_free(midend_data *me)
 {
     sfree(me->states);
     sfree(me->seed);
+    if (me->aux_info)
+       me->ourgame->free_aux_info(me->aux_info);
     me->ourgame->free_params(me->params);
     sfree(me);
 }
@@ -106,7 +110,11 @@ void midend_new_game(midend_data *me)
 
     if (!me->fresh_seed) {
        sfree(me->seed);
-       me->seed = me->ourgame->new_seed(me->params, me->random);
+       if (me->aux_info)
+           me->ourgame->free_aux_info(me->aux_info);
+       me->aux_info = NULL;
+       me->seed = me->ourgame->new_seed(me->params, me->random,
+                                        &me->aux_info);
     } else
        me->fresh_seed = FALSE;
 
@@ -399,9 +407,12 @@ float *midend_colours(midend_data *me, int *ncolours)
     float *ret;
 
     if (me->nstates == 0) {
-        char *seed = me->ourgame->new_seed(me->params, me->random);
+       game_aux_info *aux = NULL;
+        char *seed = me->ourgame->new_seed(me->params, me->random, &aux);
         state = me->ourgame->new_game(me->params, seed);
         sfree(seed);
+       if (aux)
+           me->ourgame->free_aux_info(aux);
     } else
         state = me->states[0];
 
@@ -540,6 +551,9 @@ char *midend_game_id(midend_data *me, char *id, int def_seed)
         sfree(me->seed);
         me->seed = dupstr(seed);
         me->fresh_seed = TRUE;
+       if (me->aux_info)
+           me->ourgame->free_aux_info(me->aux_info);
+       me->aux_info = NULL;
     }
 
     return NULL;
@@ -581,3 +595,35 @@ char *midend_text_format(midend_data *me)
     else
        return NULL;
 }
+
+char *midend_solve(midend_data *me)
+{
+    game_state *s;
+    char *msg;
+
+    if (!me->ourgame->can_solve)
+       return "This game does not support the Solve operation";
+
+    if (me->statepos < 1)
+       return "No game set up to solve";   /* _shouldn't_ happen! */
+
+    msg = "Solve operation failed";    /* game _should_ overwrite on error */
+    s = me->ourgame->solve(me->states[0], me->aux_info, &msg);
+    if (!s)
+       return msg;
+
+    /*
+     * Now enter the solved state as the next move.~|~
+     */
+    midend_stop_anim(me);
+    while (me->nstates > me->statepos)
+       me->ourgame->free_game(me->states[--me->nstates]);
+    ensure(me);
+    me->states[me->nstates] = s;
+    me->statepos = ++me->nstates;
+    me->anim_time = 0.0;
+    midend_finish_move(me);
+    midend_redraw(me);
+    activate_timer(me->frontend);
+    return NULL;
+}