From e8eb271296e7f928e01e4260d6681593d232381f Mon Sep 17 00:00:00 2001
From: cel <cel@f/6sQ6d2CMxRUhLpspgGIulDxDCwYD7DzFzPNr7u5AU=.ed25519>
Date: Wed, 9 Jan 2019 10:31:37 -1000
Subject: Render castling better

---
 lib/render-msg.js | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/lib/render-msg.js b/lib/render-msg.js
index 7794382..9308495 100644
--- a/lib/render-msg.js
+++ b/lib/render-msg.js
@@ -1315,8 +1315,9 @@ function chessPieceName(c) {
 
 function renderChessSymbol(c, loc) {
   var info = chessSymbols[c] || ['?', '', 'unknown']
+  var piece = info && c !== ' ' ? info[1] + ' ' + info[2] : ''
   return h('span.symbol', {
-    title: info[1] + ' ' + info[2] + (loc ? ' at ' + loc : '')
+    title: piece + (piece && loc ? ' at ' : '') + (loc || '')
   }, info[0])
 }
 
@@ -1327,7 +1328,18 @@ function chessLocToIdxs(loc) {
 
 function lookupPiece(board, loc) {
   var idxs = chessLocToIdxs(loc)
-  return idxs && board[idxs[0]] && board[idxs[0]][idxs[1]]
+  if (!idxs) return
+  var piece = board[idxs[0]] && board[idxs[0]][idxs[1]]
+  if (!piece || piece === ' ') {
+    // detect castling
+    if (idxs[0] === 0 || idxs[0] === 7) {
+      if (idxs[1] === 0) idxs[1]++
+      else if (idxs[1] == 7) idxs[1]--
+      else return piece
+      piece = board[idxs[0]] && board[idxs[0]][idxs[1]]
+    }
+  }
+  return piece
 }
 
 function chessIdxsToLoc(i, j) {
@@ -1455,7 +1467,7 @@ RenderMsg.prototype.chessMoveFull = function (cb) {
       }),
       h('p',
         // 'player ', (c.ply || ''), ' ',
-        'moved ', (piece ? [renderChessSymbol(piece), ' '] : ''),
+        piece ? ['moved ', renderChessSymbol(piece), ' '] : '',
         'from ' + c.orig, ' ',
         'to ' + c.dest
       ),
-- 
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