[gnome-games] Fix engine string being freed (bug in vala with string properties)

[Robert Ancell <rancell src gnome org>]

commit 579165c15e3d851c8ddcc9d57f0d6e3df64e6079
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Jan 19 08:00:37 2011 +1100

    Fix engine string being freed (bug in vala with string properties)

 glchess/src/chess-engine-cecp.vala |    2 +-
 glchess/src/chess-engine-uci.vala  |    2 +-
 glchess/src/chess-game.vala        |   19 ++++++++-----------
 3 files changed, 10 insertions(+), 13 deletions(-)
---
diff --git a/glchess/src/chess-engine-cecp.vala b/glchess/src/chess-engine-cecp.vala
index c0b561c..a5008c7 100644
--- a/glchess/src/chess-engine-cecp.vala
+++ b/glchess/src/chess-engine-cecp.vala
@@ -82,7 +82,7 @@ public class ChessEngineCECP : ChessEngine
         {
             /* Stop the AI from automatically moving in response to this one */
             write_line ("force");
-            write_line (move.engine);
+            write_line (move.get_engine ());
         }
         moving = false;
     }
diff --git a/glchess/src/chess-engine-uci.vala b/glchess/src/chess-engine-uci.vala
index 93f10d5..842cd5f 100644
--- a/glchess/src/chess-engine-uci.vala
+++ b/glchess/src/chess-engine-uci.vala
@@ -31,7 +31,7 @@ public class ChessEngineUCI : ChessEngine
     {
         if (position_command == "position startpos")
             position_command += " moves";
-        position_command += " " + move.engine;
+        position_command += " " + move.get_engine ();
         write_line (position_command);
     }
 
diff --git a/glchess/src/chess-game.vala b/glchess/src/chess-game.vala
index 81a0536..2d924f6 100644
--- a/glchess/src/chess-game.vala
+++ b/glchess/src/chess-game.vala
@@ -163,18 +163,15 @@ public class ChessMove
     }
 
     /* Move suitable for a chess engine (CECP/UCI) */
-    public string engine
+    public string get_engine ()
     {
-        get
-        {
-            var builder = new StringBuilder ();
-            const char promotion_symbols[] = {' ', 'r', 'n', 'b', 'q', ' '};
-            if (promotion_piece != null)
-                builder.append_printf ("%c%d%c%d%c", 'a' + f0, r0 + 1, 'a' + f1, r1 + 1, promotion_symbols[promotion_piece.type]);
-            else
-                builder.append_printf ("%c%d%c%d", 'a' + f0, r0 + 1, 'a' + f1, r1 + 1);
-            return builder.str;
-        }
+        var builder = new StringBuilder ();
+        const char promotion_symbols[] = {' ', 'r', 'n', 'b', 'q', ' '};
+        if (promotion_piece != null)
+            builder.append_printf ("%c%d%c%d%c", 'a' + f0, r0 + 1, 'a' + f1, r1 + 1, promotion_symbols[promotion_piece.type]);
+        else
+            builder.append_printf ("%c%d%c%d", 'a' + f0, r0 + 1, 'a' + f1, r1 + 1);
+        return builder.str;
     }
 
     public ChessMove copy ()