gameoflife_term.py

import os, random, time, fcntl, termios, struct

# SETUP
BACKGROUND=" "
FILL="."
BUFFER = []
FRAMERATE = 20

# To get terminal number of lines and columns
def ioctl_GWINSZ(fd):
    cr = struct.unpack('hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
    return cr
size = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
WIDTH,HEIGHT = int(size[1]), int(size[0])

def neighbours(x,y):
    total = 0
    for pos in [(-1,-1),(-1,0),(-1,1),(0,-1),(0,1),(1,-1),(1,0),(1,1)]:
        try:
            if BUFFER[y+pos[0]][x+pos[1]] == FILL:
                total += 1
        except IndexError:
             pass
    return total

def draw():
    to_live = []
    to_die = []
    for y in range(HEIGHT):
        for x in range(WIDTH):
           status = neighbours(x,y)
           if status < 2 or status > 3:
               to_die.append((x,y))
           if status == 3:
               to_live.append((x,y))
    while to_live:
        x,y = to_live.pop()
        BUFFER[y][x] = FILL
    while to_die:
        x,y = to_die.pop()
        BUFFER[y][x] = BACKGROUND

def background(c):
    global BACKGROUND, BUFFER
    BACKGROUND = c
    BUFFER = [ [ BACKGROUND for _ in range(WIDTH) ] for _ in range(HEIGHT) ]

def glider(x,y):
    BUFFER[y][x+1] = FILL
    BUFFER[y+1][x+2] = FILL
    BUFFER[y+2][x] = FILL
    BUFFER[y+2][x+1] = FILL
    BUFFER[y+2][x+2] = FILL

# Setup the buffer
background(" ")

# Add some random gliders
for _ in range(100): glider(random.randint(0,WIDTH-5),random.randint(0,HEIGHT-5))

try:
    while True:
        for line in BUFFER:
            print("".join(line))
        draw()
        time.sleep(1/FRAMERATE)
except KeyboardInterrupt:
    pass