How to print rotating ◓->tick as progress bar in terminal?

yingqiuz · May 30, 2021, 7:18pm

Hi all

I’m looking into progress bar options for Julia. Many packages, during installation, show a rotating ◓ becoming a tick when finished. Anyone can help how to print out this dynamic symbol?

Thanks a lot!

carstenbauer · May 30, 2021, 7:21pm

Not the rotating symbol but GitHub - timholy/ProgressMeter.jl: Progress meter for long-running computations offers a progress bar.

contradict · May 30, 2021, 8:11pm

Looks like it is mixed in with the precompile monitoring logic, but the list of characters is easy to grab:

github.com

JuliaLang/Pkg.jl/blob/9f67253529c72753cbfbb0078a80717f6c9bd90f/src/API.jl#L1121


      
          
          
t_print = @async begin # fancy print loop
              try
                  wait(first_started)
                  (isempty(pkg_queue) || interrupted_or_done.set) && return
                  fancyprint && lock(print_lock) do
                      printpkgstyle(io, :Precompiling, "project...")
                      print(io, ansi_disablecursor)
                  end
                  t = Timer(0; interval=1/10)
                  anim_chars = ["◐","◓","◑","◒"]
                  i = 1
                  last_length = 0
                  bar = MiniProgressBar(; indent=2, header = "Progress", color = Base.info_color(), percentage=false, always_reprint=true)
                  n_total = length(depsmap)
                  bar.max = n_total - n_already_precomp
                  final_loop = false
                  n_print_rows = 0
                  while !printloop_should_exit
                      lock(print_lock) do
                          term_size = Base.displaysize(stdout)::Tuple{Int,Int}

stevengj · May 30, 2021, 8:33pm

See also this issue to add spinner animations to ProgressMeter.jl, which links to some sample code: Different ProgressBar styles? · Issue #92 · timholy/ProgressMeter.jl · GitHub

yingqiuz · May 30, 2021, 8:53pm

Thank you, it is very helpful.

stevengj · May 30, 2021, 10:47pm

A PR to support rotating “spinners” in ProgressMeter.jl is here: add spinner option to ProgressUnknown by stevengj · Pull Request #206 · timholy/ProgressMeter.jl · GitHub

stevengj · June 1, 2021, 12:00pm

With the latest version of ProgressMeter (1.7.1), you can now just pass spinner=true when creating a ProgressUnknown meter. For example:

prog = ProgressUnknown("Working hard:", spinner=true)
while true
    ProgressMeter.next!(prog)
    rand(1:2*10^8) == 1 && break
end
ProgressMeter.finish!(prog)

Ashlin_Harris · February 1, 2023, 3:27pm

Another (somewhat silly) way to draw a spinner:

command = "
  t=Threads.@async read(stdin, Char)
  while !istaskdone(t)
    for q=['◒','◐','◓','◑']
      print(q)
      sleep(0.1)
      print('\b')
    end
  end
";
let
  proc_input = Pipe();
  proc = run(pipeline(`julia -e $command`, stdin = proc_input, stdout = stdout, stderr = stderr), wait = false)
  sleep(2)
  write(proc_input,'c') #Signal the spinner process to stop
  while(process_running(proc))
    sleep(0.1)
  end
end

The spinner is drawn by shelling out to an external Julia process, which has its downsides, but it can update completely independently of the main process. I could never get kill() to work here, so the spinner process just runs until it reads something from its stdin.