ability to create new games as white or black

.gitignore

@@ -1 +1,2 @@
 __pycache__/
+data/

plugin/chess/__init__.py

@@ -1,20 +1,36 @@
-from cinput import ControlInput, Button
+from os import path
 from enum import Enum, auto
+import re
+import itertools
+from cinput import ControlInput, Button
 from graphics import Graphics
 from .draw import Draw
-from .sunfish import initial
+from . import sunfish
 
 class GameState(Enum):
     MAIN_MENU = auto()
+    PLAYING = auto()
     THINKING = auto()
     CHOOSE_ROW = auto()
     CHOOSE_COL = auto()
     GAME_OVER = auto()
 
+SAVE_FILE = path.join("data", "chess_state.fen")
+
 def execute(cinput: ControlInput, graphics: Graphics, _):
     graphics.clear()
     draw = Draw(graphics)
-    draw.draw_board(initial)
+    pos: sunfish.Position
+
+    if path.exists(SAVE_FILE):
+        with open(SAVE_FILE, "r") as fen:
+            fenstr = fen.read()
+            pos = parseFEN(fenstr)
+    else:
+        pos = sunfish.Position(
+                sunfish.initial, 0, (True,True), (True,True), 0, 0)
+
+    draw.draw_board(pos.board)
 
     state = GameState.MAIN_MENU
     menu_index = 0
@@ -22,6 +38,8 @@ def execute(cinput: ControlInput, graphics: Graphics, _):
     while True:
         if state == GameState.MAIN_MENU:
             draw.draw_menu(menu_index)
+        elif state == GameState.PLAYING:
+            draw.draw_state()
 
         key = cinput.get_one_shot()
         if state == GameState.MAIN_MENU:
@@ -31,5 +49,52 @@ def execute(cinput: ControlInput, graphics: Graphics, _):
                     menu_index = 0
             elif key == Button.DIR_D:
                 menu_index += 1
-                if menu_index > 2:
-                    menu_index = 2
+                if menu_index > 3:
+                    menu_index = 3
+            elif key == Button.BTN_B:
+                if menu_index == 0:
+                    state = GameState.PLAYING
+                elif menu_index == 1:
+                    with open(SAVE_FILE, "w") as fen:
+                        fen.write(renderFEN(pos))
+                    return
+                elif menu_index == 2 or menu_index == 3:
+                    pos = sunfish.Position(
+                            sunfish.initial, 0, (True,True), (True,True), 0, 0)
+                    if menu_index == 3:
+                        pos = pos.rotate()
+                    draw.draw_board(pos.board)
+                    state = GameState.PLAYING
+
+        elif state == GameState.PLAYING:
+            if key == Button.BTN_A:
+                state = GameState.MAIN_MENU
+
+def get_color(pos):
+    return 1 if pos.board.startswith('\n') else 0
+
+def parseFEN(fen):
+    """ Parses a string in Forsyth-Edwards Notation into a Position """
+    board, color, castling, enpas, _, _ = fen.split()
+    board = re.sub(r'\d', (lambda m: '.'*int(m.group(0))), board)
+    board = list(21*' ' + '  '.join(board.split('/')) + 21*' ')
+    board[9::10] = ['\n']*12
+    board = ''.join(board)
+    wc = ('Q' in castling, 'K' in castling)
+    bc = ('k' in castling, 'q' in castling)
+    ep = sunfish.parse(enpas) if enpas != '-' else 0
+    score = sum(sunfish.pst[p][i] for i,p in enumerate(board) if p.isupper())
+    score -= sum(sunfish.pst[p.upper()][119-i] for i,p in enumerate(board) if p.islower())
+    pos = sunfish.Position(board, score, wc, bc, ep, 0)
+    return pos if color == 'w' else pos.rotate()
+
+def renderFEN(pos, half_move_clock=0, full_move_clock=1):
+    color = 'wb'[get_color(pos)]
+    if get_color(pos) == 1:
+        pos = pos.rotate()
+    board = '/'.join(pos.board.split())
+    board = re.sub(r'\.+', (lambda m: str(len(m.group(0)))), board)
+    castling = ''.join(itertools.compress('KQkq', pos.wc[::-1]+pos.bc)) or '-'
+    ep = sunfish.render(pos.ep) if not pos.board[pos.ep].isspace() else '-'
+    clock = '{} {}'.format(half_move_clock, full_move_clock)
+    return ' '.join((board, color, castling, ep, clock))

plugin/chess/draw.py

@@ -52,9 +52,10 @@ class Draw:
             }
 
     MENU = [
+            "Play",
+            "Quit",
             "New (W)",
-            "New (B)",
-            "Quit"]
+            "New (B)"]
 
     def __init__(self, graphics: Graphics):
         self._graphics = graphics
@@ -78,11 +79,12 @@ class Draw:
                 self.BOARD_SIZE, 0, self.BOARD_SIZE, self.BOARD_SIZE, 0)
 
     def draw_board(self, board: str):
+        ic(board)
+        is_black = board.startswith('\n')
         self._graphics.fill_rect(0, 0, self.BOARD_SIZE, self.BOARD_SIZE, 0)
         nb = "".join(board.split())
         c = True
         for row in range(8):
-            c = not c
             for col in range(8):
                 if c:
                     x = col * self.SQUARE_SIZE
@@ -90,9 +92,10 @@ class Draw:
                     self._graphics.fill_rect(x, y, self.SQUARE_SIZE, self.SQUARE_SIZE, 1)
                 p = nb[(row * 8) + col]
                 if p.lower() in self.PIECES:
-                    self._draw_piece(self.PIECES[p.lower()], p.isupper(), col, row, c)
-
+                    self._draw_piece(
+                            self.PIECES[p.lower()], p.isupper() if not is_black else p.islower(), col, row, c)
                 c = not c
+            c = not c
         self._graphics.show()
 
     def draw_menu(self, menu_index: int):
@@ -102,3 +105,7 @@ class Draw:
             marker = "> " if i == menu_index else "  "
             self._graphics.text(marker + self.MENU[i], 12, i + 2, 1)
         self._graphics.show()
+
+    def draw_state(self):
+        self._clear_info()
+        self._graphics.show()