From c4df31e43879285ac16fc47f429d2ccd2aa0019f Mon Sep 17 00:00:00 2001
From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Sun, 8 May 2011 17:47:40 +0200
Subject: [PATCH] Automatically play moves of clicked PV in analyze mode

The Shift key now no longer needs to be pressed to play moves from the
PV in analyze mode (so it could be given back its original meaning of
starting a variation with the entered moves). In analyze mode the PV
walk begins after the first move, so a static right-click plays the
first PV move. To just peek the PV you have to walk to the start of it
before releasing the mouse button. In other modes the PV walk
stillstarts at the very end.
---
 backend.c |   23 ++++++++++++-----------
 1 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/backend.c b/backend.c
index bf89ee3..999fcfd 100644
--- a/backend.c
+++ b/backend.c
@@ -5293,12 +5293,6 @@ fprintf(debugFP,"parsePV: %d %c%c%c%c yy='%s'\nPV = '%s'\n", valid, fromX+AAA, f
     endPV++;
     CopyBoard(boards[endPV], boards[endPV-1]);
     ApplyMove(fromX, fromY, toX, toY, promoChar, boards[endPV]);
-    moveList[endPV-1][0] = fromX + AAA;
-    moveList[endPV-1][1] = fromY + ONE;
-    moveList[endPV-1][2] = toX + AAA;
-    moveList[endPV-1][3] = toY + ONE;
-    moveList[endPV-1][4] = promoChar;
-    moveList[endPV-1][5] = NULLCHAR;
     CoordsToComputerAlgebraic(fromY, fromX, toY, toX, promoChar, moveList[endPV - 1]);
     strncat(moveList[endPV-1], "\n", MOVE_LEN);
     CoordsToAlgebraic(boards[endPV - 1],
@@ -5315,7 +5309,7 @@ fprintf(debugFP,"parsePV: %d %c%c%c%c yy='%s'\nPV = '%s'\n", valid, fromX+AAA, f
 
 int
 MultiPV(ChessProgramState *cps)
-{	// check if engine supports MultiPV, and if so, return the nmber of the option that sets it
+{	// check if engine supports MultiPV, and if so, return the number of the option that sets it
 	int i;
 	for(i=0; i<cps->nrOptions; i++)
 	    if(!strcmp(cps->option[i].name, "MultiPV") && cps->option[i].type == Spin)
@@ -5348,7 +5342,7 @@ LoadMultiPV(int x, int y, char *buf, int index, int *start, int *end)
 		*start = *end = 0;
 		return TRUE;
 	}
-	ParsePV(buf+startPV, FALSE, !shiftKey);
+	ParsePV(buf+startPV, FALSE, gameMode != AnalyzeMode);
 	*start = startPV; *end = index-1;
 	return TRUE;
 }
@@ -5368,15 +5362,22 @@ UnLoadPV()
   int oldFMM = forwardMostMove; // N.B.: this was currentMove before PV was loaded!
   if(endPV < 0) return;
   endPV = -1;
-  if(shiftKey && gameMode == AnalyzeMode) {
-	if(pushed) storedGames--; // abandon shelved tail of original game
+  if(gameMode == AnalyzeMode && currentMove > forwardMostMove) {
+	Boolean saveAnimate = appData.animate;
+	if(pushed) {
+	    if(shiftKey && storedGames < MAX_VARIATIONS-2) { // wants to start variation, and there is space
+		if(storedGames == 1) GreyRevert(FALSE);      // we already pushed the tail, so just make it official
+	    } else storedGames--; // abandon shelved tail of original game
+	}
 	pushed = FALSE;
 	forwardMostMove = currentMove;
 	currentMove = oldFMM;
+	appData.animate = FALSE;
 	ToNrEvent(forwardMostMove);
+	appData.animate = saveAnimate;
   }
   currentMove = forwardMostMove;
-  if(pushed) { PopInner(0); pushed = FALSE; } // restore shelved game contnuation
+  if(pushed) { PopInner(0); pushed = FALSE; } // restore shelved game continuation
   ClearPremoveHighlights();
   DrawPosition(TRUE, boards[currentMove]);
 }
-- 
1.7.0.4