Only truncate history if needed.

[remoteglot] / www / js / remoteglot.js

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index bf43403ef7a6b7a3420103320b95872a37770f02..595bce185aa1a3457dc89cb5241fe5abee9c307e 100644 (file)
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -407,7 +407,7 @@ var add_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit, opt_s
 var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        var pv = '';
        var i = 0;
-       if (opt_limit && opt_showlast) {
+       if (opt_limit && opt_showlast && pretty_pv.length > opt_limit) {
                // Truncate the PV at the beginning (instead of at the end).
                // We assume here that toplay is 'W'. We also assume that if
                // opt_showlast is set, then it is the history, and thus,
@@ -455,7 +455,7 @@ var update_highlight = function() {
 }
 
 var update_history = function() {
-       if (display_lines[0] === null) {
+       if (display_lines[0] === null || display_lines[0].pretty_pv.length == 0) {
                $("#history").html("No history");
        } else if (truncate_display_history) {
                $("#history").html(print_pv(0, display_lines[0].pretty_pv, 1, 'W', 8, true));
@@ -749,7 +749,7 @@ var update_displayed_line = function() {
        $("#linenav").show();
        $("#linemsg").hide();
 
-       if (current_display_move == 0) {
+       if (current_display_move <= 0) {
                $("#prevmove").html("Previous");
        } else {
                $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
@@ -762,15 +762,29 @@ var update_displayed_line = function() {
 
        hiddenboard.position(current_display_line.start_fen, false);
        for (var i = 0; i <= current_display_move; ++i) {
+               var pos = hiddenboard.position();
                var move = current_display_line.uci_pv[i];
+               var source = move.substr(0, 2);
+               var target = move.substr(2, 2);
                var promo = move.substr(4, 1);
-               move = move.substr(0, 2) + "-" + move.substr(2, 2);
+
+               // Check if we need to do en passant.
+               var piece = pos[source];
+               if (piece == "wP" || piece == "bP") {
+                       if (source.substr(0, 1) != target.substr(0, 1) &&
+                           pos[target] === undefined) {
+                               var ep_square = target.substr(0, 1) + source.substr(1, 1);
+                               delete pos[ep_square];
+                               hiddenboard.position(pos, false);
+                       }
+               }
+
+               move = source + "-" + target;
                hiddenboard.move(move, false);
+               pos = hiddenboard.position();
 
                // Do promotion if needed.
                if (promo != "") {
-                       var pos = hiddenboard.position();
-                       var target = move.substr(3, 2);
                        pos[target] = pos[target].substr(0, 1) + promo.toUpperCase();
                        hiddenboard.position(pos, false);
                }