还剩几步没做

按贡献流程模型，已完成 {fork, clone}，remaining 交回还剩几步？

贡献流程模型：STEPS = fork → clone → branch → commit → push → pr → review → merge。step_index 排第几、next_step 下一步、remaining(已完成集合) 还剩几步、done 走完没。

STEPS = ["fork", "clone", "branch", "commit", "push", "pr", "review", "merge"]


def step_index(s):
    """这一步在整条贡献流程里排第几（从 0 数）。"""
    return STEPS.index(s)


def next_step(s):
    """贡献流程往前推一步；到 merge 就停。"""
    i = STEPS.index(s)
    return STEPS[min(i + 1, len(STEPS) - 1)]


def remaining(done):
    """还剩几步没做（done 是已完成的步骤集合）。"""
    return sum(1 for s in STEPS if s not in done)


def done(done_set):
    """整条流程是不是全走完了。"""
    return all(s in done_set for s in STEPS)

print(remaining({"fork", "clone"}))