Source file import.ml

include Stdune

module Json = struct
  type t = Yojson.Safe.t

  let pp ppf (t : t) = Yojson.Safe.pretty_print ppf t
end

module Log = struct
  let level : (string option -> bool) ref = ref (fun _ -> false)

  let out = ref Format.err_formatter

  type message =
    { message : string
    ; payload : (string * Json.t) list
    }

  let msg message payload = { message; payload }

  let log ?section k =
    if !level section then (
      let message = k () in
      ( match section with
      | None -> Format.fprintf !out "%s@." message.message
      | Some section -> Format.fprintf !out "[%s] %s@." section message.message
      );
      ( match message.payload with
      | [] -> ()
      | fields -> Format.fprintf !out "%a@." Json.pp (`Assoc fields) );
      Format.pp_print_flush !out ()
    )
end