Simpuzz

import sys
def ptbf(stin):
    result = ''
    prog = stin.split('\n')
    prog=map(list, prog)
    xmax = max(map(len, prog))
    for a, b in enumerate(prog):
        r = xmax-len(b)
        prog[a].extend(r*[' '])
    ymax = len(prog)
    for line in range(ymax):
        for char in range(xmax):
            if prog[line][char]!='X':
                continue
            neighbors=[0,0,0]
            neighbors[0] = prog[(line-1)%ymax][(char-1)%xmax]
            neighbors[1] = prog[(line-1)%ymax][(char)]
            neighbors[2] = prog[(line-1)%ymax][(char+1)%xmax]
            neighbors = tuple(neighbors)
            result+={('X','X','X'):'+', (' ',' ',' '):'-', (' ',' ','X'):'>', ('X',' ',' '):'<', (' ','X',' '):'.', ('X',' ','X'):',', ('X','X',' '):'[', (' ','X','X'):']'}[neighbors]
    return result

if __name__=="__main__":
    z = open(sys.argv[1], "rb+")
    contents = z.read()
    if len(sys.argv)==3:
       r = open(sys.argv[2], "w+")
    else:
       r = open(sys.argv[1], "w+")
    r.write(ptbf(contents))
    z.close()
    r.close()