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qp2/ocaml/Progress_bar.ml
2019-01-25 11:39:31 +01:00

92 lines
2.1 KiB
OCaml

open Core
type t =
{
title: string;
start_value: float;
cur_value : float;
end_value : float;
bar_length : int;
init_time : Time.t;
dirty : bool;
next : Time.t;
}
let init ?(bar_length=20) ?(start_value=0.) ?(end_value=1.) ~title =
{ title ; start_value ; end_value ; bar_length ; cur_value=start_value ;
init_time= Time.now () ; dirty = false ; next = Time.now () }
let update ~cur_value bar =
{ bar with cur_value ; dirty=true }
let increment_end bar =
{ bar with end_value=(bar.end_value +. 1.) ; dirty=false }
let clear bar =
Printf.eprintf " \r%!";
None
let increment_cur bar =
{ bar with cur_value=(bar.cur_value +. 1.) ; dirty=true }
let display_tty bar =
let percent =
100. *. (bar.cur_value -. bar.start_value) /.
(bar.end_value -. bar.start_value)
in
let n_hashes =
(Float.of_int bar.bar_length) *. percent /. 100.
|> Float.to_int
in
let hashes =
String.init bar.bar_length ~f:(fun i ->
if (i < n_hashes) then '#'
else ' '
)
in
let now =
Time.now ()
in
let running_time =
Time.abs_diff now bar.init_time
in
Printf.eprintf "%s : [%s] %4.1f%% | %10s\r%!"
bar.title
hashes
percent
(Time.Span.to_string running_time);
{ bar with dirty = false ; next = Time.add now (Time.Span.of_sec 0.1) }
let display_file bar =
let percent =
100. *. (bar.cur_value -. bar.start_value) /.
(bar.end_value -. bar.start_value)
in
let running_time =
Time.abs_diff (Time.now ()) bar.init_time
in
Printf.eprintf "%5.2f %% in %20s \n%!"
percent
(Time.Span.to_string running_time);
{ bar with dirty = false ; next = Time.add (Time.now ()) (Time.Span.of_sec 10.) }
let display bar =
if (not bar.dirty) then
bar
else if (Time.now () < bar.next) then
bar
else
begin
if (Unix.isatty Unix.stdout) then
display_tty bar
else
display_file bar
end