Source file logging.ml

(** Logging configuration for Migra. *)

(** Setup logging with timestamps.

    This is called automatically when the library loads. You typically don't
    need to call this manually. *)
let setup () =
  (* Check if the default nop reporter is still active *)
  let current_reporter = Logs.reporter () in
  if current_reporter == Logs.nop_reporter then
    (* No reporter set up yet, install ours *)
  begin
    Fmt_tty.setup_std_outputs ();
    let pp_header ppf (l, h) =
      let timestamp = Unix.gettimeofday () in
      let tm = Unix.localtime timestamp in
      let frac = int_of_float ((timestamp -. floor timestamp) *. 1000.) in
      let header = match h with Some h -> h | None -> "migra" in
      Fmt.pf ppf "%02d.%02d.%02d %02d:%02d:%02d.%03d %15s %a "
        (tm.tm_year mod 100) (tm.tm_mon + 1) tm.tm_mday tm.tm_hour tm.tm_min
        tm.tm_sec frac header Logs.pp_level l
    in
    let reporter = Logs_fmt.reporter ~pp_header () in
    Logs.set_reporter reporter;
    Logs.set_level (Some Logs.Info);
    ()
  end
  else
    (* Reporter already exists, respect the existing configuration *)
    ()

(** Set the minimum log level. *)
let set_level level = Logs.set_level (Some level)

(* Automatically initialize logging when the library is loaded *)
let () = setup ()