Add support for expanding and truncating the history.

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index c103716d52bd7aaa314c5fb360f27ba2601a5e63..3189396c170526376c67492f4d380b0506a8a6f8 100644 (file)
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -36,6 +36,9 @@ var ims = 0;
 /** @type {boolean} @private */
 var sort_refutation_lines_by_score = true;
 
+/** @type {boolean} @private */
+var truncate_display_history = true;
+
 /** @type {!string|undefined} @private */
 var highlight_from = undefined;
 
@@ -379,33 +382,46 @@ var thousands = function(x) {
  * @param {number=} opt_limit
  * @param {boolean=} opt_showlast
  */
-var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
+var add_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        display_lines.push({
                start_fen: fen,
                uci_pv: uci_pv,
                pretty_pv: pretty_pv 
        });
+       return print_pv(display_lines.length - 1, pretty_pv, move_num, toplay, opt_limit, opt_showlast);
+}
 
+/**
+ * @param {number} line_num
+ * @param {Array.<string>} pretty_pv
+ * @param {number} move_num
+ * @param {!string} toplay
+ * @param {number=} opt_limit
+ * @param {boolean=} opt_showlast
+ */
+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) {
                // Truncate the PV at the beginning (instead of at the end).
-               // We assume here that toplay is 'W'.
-               pv = '(…) ';
+               // We assume here that toplay is 'W'. We also assume that if
+               // opt_showlast is set, then it is the history, and thus,
+               // the UI should be to expand the history.
+               pv = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
                i = pretty_pv.length - opt_limit;
                if (i % 2 == 1) {
                        ++i;
                }
                move_num += i / 2;
        } else if (toplay == 'B') {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
+               var move = "<a class=\"move\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
                pv = move_num + '. … ' + move;
                toplay = 'W';
                ++i;
                ++move_num;
        }
        for ( ; i < pretty_pv.length; ++i) {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + i + ");\">" + pretty_pv[i] + "</a>";
+               var move = "<a class=\"move\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pretty_pv[i] + "</a>";
 
                if (toplay == 'W') {
                        if (i > opt_limit && !opt_showlast) {
@@ -433,6 +449,27 @@ var update_highlight = function() {
        }
 }
 
+var update_history = function() {
+       if (display_lines[0] === null) {
+               $("#history").html("No history");
+       } else if (truncate_display_history) {
+               $("#history").html(print_pv(0, display_lines[0].pretty_pv, 1, 'W', 8, true));
+       } else {
+               $("#history").html(
+                       '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
+                       print_pv(0, display_lines[0].pretty_pv, 1, 'W'));
+       }
+}
+
+/**
+ * @param {!boolean} truncate_history
+ */
+var collapse_history = function(truncate_history) {
+       truncate_display_history = truncate_history;
+       update_history();
+}
+window['collapse_history'] = collapse_history;
+
 var update_refutation_lines = function() {
        if (fen === null) {
                return;
@@ -478,7 +515,7 @@ var update_refutation_lines = function() {
                var pv_td = document.createElement("td");
                tr.appendChild(pv_td);
                $(pv_td).addClass("pv");
-               $(pv_td).html(print_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10));
+               $(pv_td).html(add_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10));
 
                tbl.append(tr);
        }
@@ -569,13 +606,14 @@ var update_board = function(data, num_viewers) {
 
        // Print the history.
        if (data['position']['history']) {
-               $("#history").html(print_pv('start', data['position']['history'], data['position']['pretty_history'], 1, 'W', 8, true));
+               add_pv('start', data['position']['history'], data['position']['pretty_history'], 1, 'W', 8, true);
        } else {
-               $("#history").html("No history");
+               displayed_lines.push(null);
        }
+       update_history();
 
        // Print the PV.
-       $("#pv").html(print_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
+       $("#pv").html(add_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
 
        // Update the PV arrow.
        clear_arrows();
@@ -649,6 +687,15 @@ var resort_refutation_lines = function(sort_by_score) {
 }
 window['resort_refutation_lines'] = resort_refutation_lines;
 
+/**
+ * @param {boolean} truncate_history
+ */
+var set_truncate_history = function(truncate_history) {
+       truncate_display_history = truncate_history;
+       update_refutation_lines();
+}
+window['set_truncate_history'] = set_truncate_history;
+
 /**
  * @param {number} line_num
  * @param {number} move_num