game of life in [redacted] mk2

named game;
using string;
using core.stdio;
using core.clock;

extrn main = fn(args = slc[str]) IO {nil} {
    # get seed
    gen = u64;
    if len(args) == 1 {
        gen = 6742;
    } else {
        match string::to_u64(args[1]) {
            r = u64 | gen = r;
            nil     | panic("invalid seed");
        };
    };
    # the cells map will be represented as a bi-dimensional list
    map = [256][256]lst[bool]{{F...}...};

    # set initial state
    for c = 0..255; r = 0..255 {
        map[c][r] = (gen & (gen << c)) % r == 1;
    };
    old = map; # copy assignment

    stdio::putf("generation 0 of %d\n", duration)!;

    for g = 0..512 {
        if g > 0 {
            # if past first interaction, clean screen
            stdio::puts("\x1b8\r")!;
            stdio::putf("generation {} of {}\n", g, duration)!;
        };
        line = str;
        for r = 0..length {
            for c = 0..length {
                # neighbors' count
                nbcnt = 0;
                for h_ofst = -1..1 {
                    for v_ofst = -1..1 {
                        # avoid checking cells out of the map
                        if v_ofst < length + 1
                            and h_ofst < length + 1
                            and r + v_ofst > 0
                            and c + h_ofst > 0 {
                            # skip itself
                            if v_ofst == h_ofst and v_ofst == 0 {
                                next;
                            };
                            if old[r + v_ofst][c + h_ofst] {
                                nbcnt += 1;
                            };
                        };
                    };
                };
                cell = old[r][c];
                if cell {
                    if nbcnt < 2 or nbcnt > 3 {
                        map[r][c] = F;
                    } else {
                        map[r][c] = cell;
                    };
                } elif nbcnt == 3 {
                    map[r][c] = T;
                } else {
                    map[r][c] = cell;
                };

                # print cells
                if cell {
                    stdio::putf("{} ", nbcnt)!;
                } else {
                    stdio::puts(". ")!;
                };
            };
            stdio::puts("\n")!;
        };
        old = map;
        clock::sleep(500);
    };
};