Chess!

src/scripts/chess.coffee

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+# Description:
+#   Play a game of chess!
+#
+# Dependencies:
+#   "chess": "0.1.3"
+#
+# Configuration:
+#   None
+#
+# Commands:
+#   hubot chess me - Creates a new game between yourself and another person in the room
+#   hubot chess status - Gets the current state of the board
+#   hubot chess move <to> - Moves a piece to the coordinate position using standard chess notation
+#
+# Author:
+#   thallium205
+#
+
+Chess = require 'chess'
+
+module.exports = (robot) ->
+  robot.respond /chess me$/i, (msg) ->
+    robot.brain.data.chess = Chess.create()
+    boardToFen robot.brain.data.chess.getStatus(), (status, fen) ->
+      msg.send 'http://webchess.freehostia.com/diag/chessdiag.php?fen=' + encodeURIComponent(fen) + '&size=large&coord=yes&cap=yes&stm=yes&fb=no&theme=classic&format=auto&color1=E3CEAA&color2=635147&color3=000000&.png'
+  robot.respond /chess status/i, (msg) ->
+    try
+      boardToFen robot.brain.data.chess.getStatus(), (status, fen) ->
+        if status
+          msg.send status
+        msg.send 'http://webchess.freehostia.com/diag/chessdiag.php?fen=' + encodeURIComponent(fen) + '&size=large&coord=yes&cap=yes&stm=yes&fb=no&theme=classic&format=auto&color1=E3CEAA&color2=635147&color3=000000&.png'
+    catch e
+      msg.send e
+
+  robot.respond /chess move (.*)/i, (msg) ->
+    try
+      robot.brain.data.chess.move msg.match[1]
+      boardToFen robot.brain.data.chess.getStatus(), (status, fen) ->
+       if status
+          msg.send status
+        msg.send 'http://webchess.freehostia.com/diag/chessdiag.php?fen=' + encodeURIComponent(fen) + '&size=large&coord=yes&cap=yes&stm=yes&fb=no&theme=classic&format=auto&color1=E3CEAA&color2=635147&color3=000000&.png'
+    catch e
+      msg.send e
+
+boardToFen = (status, callback) ->
+  fen = [[],[],[],[],[],[],[],[]]
+  blank = 0
+  lastRank = 0
+  for square in status.board.squares
+    if lastRank isnt square.rank
+      if blank isnt 0
+        fen[lastRank - 1].push(blank)
+        blank = 0        
+    if square.piece is null
+      blank = blank + 1
+    else
+      if square.piece.type is 'pawn'
+        if blank is 0          
+          fen[square.rank - 1].push(if square.piece.side.name is 'white' then 'P' else 'p')
+        else
+          fen[square.rank - 1].push(blank)
+          fen[square.rank - 1].push(if square.piece.side.name is 'white' then 'P' else 'p')
+          blank = 0
+      else
+        if blank is 0
+          fen[square.rank - 1].push(if square.piece.side.name is 'white' then square.piece.notation.toUpperCase() else square.piece.notation.toLowerCase())
+        else
+          fen[square.rank - 1].push(blank)
+          fen[square.rank - 1].push(if square.piece.side.name is 'white' then square.piece.notation.toUpperCase() else square.piece.notation.toLowerCase())
+          blank = 0
+    lastRank = square.rank
+  for rank in fen
+    rank = rank.join()
+  fen = fen.reverse().join('/').replace(/,/g,'')
+
+  msg = ''
+  if status.isCheck
+    msg += 'Check! '
+  if status.isCheckmate
+    msg += 'Checkmate! '
+  if status.isRepetition
+    msg += 'Threefold Repetition!  A draw can be called. '
+  if status.isStalemate
+    msg += 'Stalemate! '
+  if Object.keys(status.notatedMoves).length > 0
+    if status.notatedMoves[Object.keys(status.notatedMoves)[0]].src.piece.side.name is 'white' 
+      fen += ' w';
+    else 
+      fen += ' b';
+
+  callback msg, fen