Add option -variations to control variation-tree walking

Just so that users can switch it off if the find it annoying.

diff --git a/args.h b/args.h
index bd142ad..fe9c7bc 100644 (file)
--- a/args.h
+++ b/args.h
@@ -185,6 +185,7 @@ ArgDescriptor argDescriptors[] = {
   { "fd", ArgFilename, (void *) &appData.firstDirectory, FALSE, INVALID },
   { "secondDirectory", ArgFilename, (void *) &appData.secondDirectory, FALSE, (ArgIniType) SECOND_DIRECTORY },
   { "sd", ArgFilename, (void *) &appData.secondDirectory, FALSE, INVALID },
+  { "variations", ArgBoolean, (void *) &appData.variations, TRUE, (ArgIniType) FALSE },
 
   /* some options only used by the XBoard front end, and ignored in WinBoard         */
   /* Their saving is controlled by XBOARD, which in WinBoard is defined as FALSE */

diff --git a/backend.c b/backend.c
index 6bd4418..94f7bee 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -6161,7 +6161,8 @@ FinishMove(moveType, fromX, fromY, toX, toY, promoChar)
      the previous line in Analysis Mode */
   if ((gameMode == AnalyzeMode || gameMode == EditGame)
                                && currentMove < forwardMostMove) {
-    PushTail(currentMove, forwardMostMove); // [HGM] vari: save tail of game
+    if(appData.variations) PushTail(currentMove, forwardMostMove); // [HGM] vari: save tail of game
+    else forwardMostMove = currentMove;
   }
 
   /* If we need the chess program but it's dead, restart it */

diff --git a/common.h b/common.h
index 4f78597..aa46600 100644 (file)
--- a/common.h
+++ b/common.h
@@ -523,6 +523,7 @@ typedef struct {
     int secondProtocolVersion;
     Boolean showButtonBar;
     Boolean icsEngineAnalyze; 
+    Boolean variations;         /* [HGM] enable variation-tree walking */
 
     /* [AS] New properties (down to the "ZIPPY" part) */
     Boolean firstScoreIsAbsolute;  /* If true, engine score is always from white side */