open Printf
open Types
open Stringify
open Parse

let main () =
  let argc = Array.length Sys.argv in
  let usage status =
    printf "usage: %s command [args]\n" Sys.argv.(0);
    printf "command:\n";
    printf "  help\n";
    printf "  echo PROGRAM\n";
    status
  in
  if argc = 1 then begin
    usage 1
  end else
    match Sys.argv.(1) with
    | "help" ->
      usage 0
    | "echo" when argc > 2 ->
      printf "%s\n" (string_of_program (parse_string Sys.argv.(2)));
      0
    | _ ->
      usage 1

let () = exit (main ())