open Core
open Hack

let read_file file =
  let not_empty str = not (String.is_empty str) in
  List.filter (In_channel.read_lines file) ~f:not_empty
;;

let outfile file = String.concat [ Filename.chop_extension file; ".hack" ]

let gen_hack file =
  let assembly = read_file file in
  let binary = Translate.translate assembly in
  let outchan = Out_channel.create (outfile file) in
  Out_channel.output_lines outchan binary;
  Out_channel.close outchan
;;

let param =
  let open Command.Param in
  anon ("filename" %: string)
;;

let command =
  Command.basic
    ~summary:"Translate <filename>.asm to <filename>.hack"
    ~readme:(fun () -> "Assembler for project 6 of Nand2Tetris")
    (Command.Param.map param ~f:(fun filename () -> gen_hack filename))
;;

let () = Command_unix.run command