try:
    from tqdm import tqdm
except ImportError:
    tqdm = None


class Progress:
    def __init__(self):
        self.hide_inner = False


    def __call__(self, iterable, description, infile=False, outfile=False):
        show_progress = True
        if True in (infile, outfile):
            assert False in (infile, outfile)
            show_progress = outfile == self.hide_inner
        
        if not show_progress:
            yield from iterable
            return
        
        if tqdm is None:
            iterlist = list(iterable)
            proc = -1
            for n, el in enumerate(iterlist):
                nxt_proc = int(n / len(iterlist) * 100)
                if nxt_proc > proc:
                    print("\r{}: {:02d}% ({}/{})".format(description, nxt_proc, n, len(iterlist)), end="")
                    proc = nxt_proc
                yield el
            print("")
        else:
            yield from tqdm(iterable, desc=description)


    def init(self, args):
        self.hide_inner = args.hide_inner_progress


progress = Progress()