X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=www%2Fjs%2Fremoteglot.js;h=1b6952db9bb58a75f14b0bccb8ac084ae14b8120;hp=738edf0d5d2ffb063d1895455741fd1f0189bbf0;hb=bc097140eb8ba34f6911ac0ef4f55988b0443ee1;hpb=ddad3efdbef2da6f410449a114511cdc6897b067

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index 738edf0..1b6952d 100644
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -254,7 +254,7 @@ var position_arrow = function(arrow) {
 		arrow.svg.parentElement.removeChild(arrow.svg);
 		delete arrow.svg;
 	}
-	if (current_display_line !== null) {
+	if (current_display_line !== null && !current_display_line_is_history) {
 		return;
 	}
 
@@ -489,7 +489,8 @@ var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_sh
 
 var update_highlight = function() {
 	$("#board").find('.square-55d63').removeClass('nonuglyhighlight');
-	if (current_display_line === null && highlight_from !== undefined && highlight_to !== undefined) {
+	if ((current_display_line === null || current_display_line_is_history) &&
+	    highlight_from !== undefined && highlight_to !== undefined) {
 		$("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
 		$("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
 	}
@@ -641,6 +642,27 @@ var update_board = function(current_data, display_data) {
 		document.title = 'analysis.sesse.net';
 	}
 
+	// The last move (shown by highlighting the from and to squares).
+	if (data['position'] && data['position']['last_move_uci']) {
+		highlight_from = data['position']['last_move_uci'].substr(0, 2);
+		highlight_to = data['position']['last_move_uci'].substr(2, 2);
+	} else if (current_display_line_is_history && current_display_move >= 0) {
+		// We don't have historic analysis for this position, but we
+		// can reconstruct what the last move was by just replaying
+		// from the start.
+		var hiddenboard = new Chess();
+		for (var i = 0; i <= current_display_move; ++i) {
+			hiddenboard.move(current_display_line.pretty_pv[i]);
+		}
+		var moves = hiddenboard.history({ verbose: true });
+		var last_move = moves.pop();
+		highlight_from = last_move.from;
+		highlight_to = last_move.to;
+	} else {
+		highlight_from = highlight_to = undefined;
+	}
+	update_highlight();
+
 	if (data['failed']) {
 		$("#score").text("No analysis for this move");
 		$("#pv").empty();
@@ -648,6 +670,8 @@ var update_board = function(current_data, display_data) {
 		$("#refutationlines").empty();
 		refutation_lines = [];
 		update_refutation_lines();
+		clear_arrows();
+		update_displayed_line();
 		return;
 	}
 
@@ -686,14 +710,6 @@ var update_board = function(current_data, display_data) {
 	fen = data['position']['fen'];
 	update_displayed_line();
 
-	if (data['position']['last_move_uci']) {
-		highlight_from = data['position']['last_move_uci'].substr(0, 2);
-		highlight_to = data['position']['last_move_uci'].substr(2, 2);
-	} else {
-		highlight_from = highlight_to = undefined;
-	}
-	update_highlight();
-
 	// Print the PV.
 	$("#pv").html(add_pv(data['position']['fen'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));