Handling of ansi codes.
val printf : attr list ‑> ('a, Core.Out_channel.t, unit) Core.format ‑> 'aval eprintf : attr list ‑> ('a, Core.Out_channel.t, unit) Core.format ‑> 'aval output_string : attr list ‑> Core.Out_channel.t ‑> string ‑> unitval output : attr list ‑> Core.Out_channel.t ‑> Core.Bytes.t ‑> int ‑> int ‑> unitval string_with_attr : attr list ‑> string ‑> string