#!/usr/bin/env python3

# Plot a PGN game using python-chess and ImageMagick

import os
import chess.pgn
import chess.svg

pgn = open('sliwa_bronstein_1957.pgn')
game = chess.pgn.read_game(pgn)
board = game.board()

def svg(i):
    lm = board.peek()
    a = [(lm.from_square, lm.to_square)]
    s = chess.svg.board(board, arrows = a, size = 800)

    f1 = "g_%04u.svg" % i
    f2 = "g_%04u.png" % i

    with open(f1, 'w') as f:
        f.write(s)
    os.system("convert %s %s" % (f1, f2))
    os.system("rm %s" % f1)

i = 1

for m in game.mainline_moves():
    board.push(m)
    svg(i)
    i += 1

# pause animation at the end:
for j in range(3):
    svg(i)
    i += 1

# create animation with
# convert -delay 150 g_*.png -loop 0 g.gif