open Seq

let to_sixteen f = ints 0 |> take 16 |> f |> Array.of_seq
let ( >>= ) = Option.bind
let mem = Fun.flip Array.mem

let colours =
  let init_default = to_sixteen (map (fun x -> Types.Simple x)) in
  Sys.getenv_opt "CULRS"
  >>= (fun s -> if String.length s > 0 then Some s else None)
  |> Option.fold ~none:init_default ~some:Parse.parse_env_colours

let order =
  let init_default = to_sixteen (filter (fun i -> i |> mem [| 0; 8 |])) in
  Sys.getenv_opt "CULR_ORDER"
  >>= (fun s -> if String.length s > 0 then Some s else None)
  |> Option.fold ~none:init_default ~some:Parse.parse_env_order