Re: [gnugo-devel] GTP command : last_move

[Gunnar Farneback]

Avis wrote:
> I was writing a front end to gnugo, and wanted to highlight the last
> move made. If the game started from scratch, I guess the burden could
> be on my program. However, for loaded games, I think that information
> is best decoded by gnugo.
>  
> Attached is the diff that implements it. Also implemented are gtp
> commands that returns the number of captured stones.

The latter are redundant since there already is a captures <color>
command. The former is included in the revised patch below.

/Gunnar

Index: doc/gtp-commands.texi
===================================================================
RCS file: /cvsroot/gnugo/gnugo/doc/gtp-commands.texi,v
retrieving revision 1.17
diff -u -r1.17 gtp-commands.texi
--- doc/gtp-commands.texi       15 Aug 2003 06:46:53 -0000      1.17
+++ doc/gtp-commands.texi       23 Aug 2003 13:16:18 -0000
@@ -368,6 +368,18 @@
 
 @end example
 
address@hidden last_move
address@hidden last_move
+
address@hidden
+
+ Function:  Return the last move.
+ Arguments: none
+ Fails:     no previous move known
+ Returns:   Color and vertex of last move.
+
address@hidden example
+
 @cindex trymove
 @item trymove
 
Index: interface/play_gtp.c
===================================================================
RCS file: /cvsroot/gnugo/gnugo/interface/play_gtp.c,v
retrieving revision 1.129
diff -u -r1.129 play_gtp.c
--- interface/play_gtp.c        12 Aug 2003 21:26:48 -0000      1.129
+++ interface/play_gtp.c        23 Aug 2003 13:16:24 -0000
@@ -119,6 +119,7 @@
 DECLARE(gtp_is_legal);
 DECLARE(gtp_known_command);
 DECLARE(gtp_ladder_attack);
+DECLARE(gtp_last_move);
 DECLARE(gtp_set_search_diamond);
 DECLARE(gtp_reset_search_mask);
 DECLARE(gtp_limit_search);
@@ -250,6 +251,7 @@
   {"komi",                   gtp_set_komi},
   {"get_komi",               gtp_get_komi},
   {"ladder_attack",                  gtp_ladder_attack},
+  {"last_move",              gtp_last_move},
   {"level",                  gtp_set_level},
   {"set_search_diamond",      gtp_set_search_diamond},
   {"reset_search_mask",       gtp_reset_search_mask},
@@ -1066,6 +1068,30 @@
     return gtp_success("%d", white_captured);
   else
     return gtp_success("%d", black_captured);
+}
+
+
+/* Function:  Return the last move.
+ * Arguments: none
+ * Fails:     no previous move known
+ * Returns:   Color and vertex of last move.
+ */
+static int
+gtp_last_move(char *s)
+{
+  int pos;
+  int color;
+  UNUSED(s);
+  
+  if (move_history_pointer <= 0)
+    return gtp_failure("no previous move known");
+  
+  pos = move_history_pos[move_history_pointer - 1];
+  color = move_history_color[move_history_pointer - 1];
+  
+  gtp_start_response(GTP_SUCCESS);
+  gtp_mprintf("%C %m", color, I(pos), J(pos));
+  return gtp_finish_response();
 }