Allow walking a kibitzed PV

If no tabs are found in te 'thinking output' we assume it is a captured
kibitz message, and look for "PV=" to locate the start of a PV in it.
Also try to include any continuation lines below the selected line.

diff --git a/backend.c b/backend.c
index 00b2d0e..f806abe 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -4888,14 +4888,17 @@ Boolean
 LoadMultiPV(int x, int y, char *buf, int index, int *start, int *end)
 {
        int startPV;
+       char *p;
 
        if(index < 0 || index >= strlen(buf)) return FALSE; // sanity
        lastX = x; lastY = y;
        while(index > 0 && buf[index-1] != '\n') index--; // beginning of line
        startPV = index;
-      while(buf[index] != '\n') if(buf[index++] == '\t') startPV = index;
-      index = startPV;
-       while(buf[index] && buf[index] != '\n') index++;
+       while(buf[index] != '\n') if(buf[index++] == '\t') startPV = index;
+       if(index == startPV && (p = StrCaseStr(buf+index, "PV="))) startPV = p - buf + 3;
+       index = startPV;
+       do{ while(buf[index] && buf[index] != '\n') index++;
+       } while(buf[index] == '\n' && buf[index+1] == '\\' && buf[index+2] == ' ' && index++); // join kibitzed PV continuation line
        buf[index] = 0;
        ParsePV(buf+startPV, FALSE);
        *start = startPV; *end = index-1;