A transpiler of Bitwise Cyclic Tag to Newbiefuck, a Brainfuck variant with do-while loops instead of while loops.

bct2nf.py

import sys


program = sys.argv[1]
init = sys.argv[2]

output = ">>>"
output += ">".join("+" * (int(d) + 1) for d in init)
output += "<" * (output.count(">") - 3)
output += "["

p = 0
while p < len(program):
    c = program[p]
    p += 1
    if c == "0":
        output += "[-]>"
    elif c == "1":
        to_push = int(program[p]) + 1
        p += 1
        output += f">[-<<<+>>>]<[-<+<<+>>>]<[->+<]>[[>]{to_push*'+'}[<]>-]>{to_push*'-'}<<<<[->>>+<<<]>[->>>+<<<]>>"

print(output + "]")