add support for resignation

index.html

@@ -149,6 +149,7 @@
                      <input id="cb_notify" type="checkbox"><label for="cb_notify">Notify</label>
                      <button id="cb_undo" type="button" disabled="true">Undo</button>
                      <button id="cb_redo" type="button" disabled="true">Redo</button>
+                     <button id="cb_resign" type="button" disabled="true">Resign</button>
                      <button id="cb_reset" type="button">Reset</button>
                      <button id="cb_pass" type="button">Pass</button>
                      <span id="cb_message"></span><br>

js/chess.js

@@ -39,11 +39,11 @@ function cloneJSON(obj){
 }
 
 function isLight(side){
-   return side[0] === 'l';
+   return side === 'l' || side === 'light';
 }
 
 function isDark(side){
-   return side[0] === 'd';
+   return side === 'd' || side === 'dark';
 }
 
 function normalizeSide(side){
@@ -161,9 +161,20 @@ function hasMoved(board, side, where){
    }
 }
 
+function gameEnded(board){
+   if (!board.move) {
+      return false;
+   } else if (board.move.took === 'k') {
+      return board.move.side;
+   } else if (board.move.resign) {
+      return otherSide(board.move.side);
+   } else {
+      return false;
+   }
+}
+
 function legalMoves(board, side, type, from, canCapture){
-   if (board.move && board.move.took === 'k') {
+   if (gameEnded(board)) {
-      /* checkmate, the game is over */
       return [];
    }
 
@@ -428,6 +439,10 @@ function renderHistory(currentBoard) {
       const board = list.pop();
       const move = board.move;
 
+      if (move.resign) {
+         break;
+      }
+
       if (move.from === 'phantom') {
          result += SHY + '*';
       } else {
@@ -511,6 +526,17 @@ function renderHistory(currentBoard) {
       }
    }
 
+   let winner = gameEnded(currentBoard);
+   if (winner) {
+      if (isLight(winner)) {
+         result += ' 1-0';
+      } else if (isDark(winner)) {
+         result += ' 0-1';
+      } else {
+         result += ' \u00bd-\u00bd'; /* 1/2-1/2 */
+      }
+   }
+
    return result;
 }
 
@@ -600,10 +626,14 @@ function renderBoard(board){
    }
 
    let msg = '';
-   if (board.move && board.move.took === 'k') {
+   let winner = gameEnded(board);
-      msg = (isDark(board.move.side) ? 'Dark' : 'Light') + ' player won!';
+   if (winner) {
+      if (board.move.resign) {
+         msg += (isLight(board.move.side) ? 'Light' : 'Dark') + ' player resigned. ';
+      }
+      msg += (isLight(winner) ? 'Light' : 'Dark') + ' player won!';
    } else {
-      msg = (isDark(board.player) ? 'Dark' : 'Light') + " player's turn";
+      msg += (isLight(board.player) ? 'Light' : 'Dark') + " player's turn.";
    }
    $('#cb_message').text(msg);
 
@@ -632,7 +662,13 @@ function setVisibleBoard(board){
       const liveBoard = $('#cb_board').data('board');
       $('#cb_undo').attr('disabled', liveBoard.prior ? false : true);
       $('#cb_redo').attr('disabled', liveBoard.subsequent ? false : true);
-      $('#cb_pass').attr('disabled', liveBoard.phantom ? true : false);
+      if (gameEnded(liveBoard)) {
+         $('#cb_pass').attr('disabled', true);
+         $('#cb_resign').attr('disabled', true);
+      } else {
+         $('#cb_pass').attr('disabled', liveBoard.phantom ? true : false);
+         $('#cb_resign').attr('disabled', false);
+      }
       $('#cb_nav_last').attr('disabled', true);
       $('#cb_board').addClass('cb-live');
       $('#cb_board').removeClass('cb-archive');
@@ -640,6 +676,7 @@ function setVisibleBoard(board){
       $('#cb_undo').attr('disabled', true);
       $('#cb_redo').attr('disabled', true);
       $('#cb_pass').attr('disabled', true);
+      $('#cb_resign').attr('disabled', true);
       $('#cb_board .ui-draggable').draggable('disable');
       $('#cb_nav_last').attr('disabled', false);
       $('#cb_board').removeClass('cb-live');
@@ -693,7 +730,8 @@ function putMeta(){
    let lightName = $('#cb_light_name').val();
    let darkName = $('#cb_dark_name').val();
    let meta = gun.get(PacoSakoUUID).get('meta').get(gameId);
-   let stat = (board.move && board.move.took === 'k') ? 'mate' : null;
+   let winner = gameEnded(board);
+   let stat = !winner ? null : (board.move.took === 'k') ? 'mate' : 'ended';
    meta.put({
       gameId: gameId,
       lightName: lightName,
@@ -955,7 +993,7 @@ $(function (){
 
    $('#cb_pass').on('click', function(){
       let board = $('#cb_board').data('board');
-      if (!board.phantom) {
+      if (!gameEnded(board) && !board.phantom) {
          let newBoard = cloneJSON(board);
          newBoard.prior = board;
          newBoard.move = { side: board.player, pass: true };
@@ -965,6 +1003,18 @@ $(function (){
       }
    });
 
+   $('#cb_resign').on('click', function(){
+      let board = $('#cb_board').data('board');
+      if (!gameEnded(board)) {
+         let newBoard = cloneJSON(board);
+         newBoard.prior = board;
+         newBoard.move = { side: board.player, resign: true };
+         newBoard.player = otherSide(board.player);
+         newBoard.timestamp = new Date().getTime();
+         putState(newBoard);
+      }
+   });
+
    $('#cb_select_game').on('change', function(){
       let optIndex = $('#cb_select_game')[0].selectedIndex;
       if (optIndex === 0) {