ocaml-tqdm is a progress bar library for OCaml. The implementation is
based on Python tqdm library.

Below is an example of how to use this library:

module T = Tqdm.Tqdm
T.with_bar 100 ~f:(fun tqdm ->
  for v = 1 to 100 do
    Unix.sleepf 0.1;
    T.update tqdm v
done);