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progress_bar

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Command-line progress bars and spinners.

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progress_bar lib progress_bar animation_server.ex
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lib/progress_bar/animation_server.ex 

defmodule ProgressBar.AnimationServer do

  use GenServer



  @name :animation_server



  # Client API



  def start(config) do

    GenServer.start(__MODULE__, {config, 0}, name: @name)

  end



  def stop do

    GenServer.call(@name, :stop)

  end



  # GenServer API



  def init(state) do

    {:ok, tick(state)}

  end



  def handle_info(:tick, state) do

    {:noreply, tick(state)}

  end



  def handle_call(:stop, _from, {config, count}) do

    config[:render_done].()

    {:stop, :normal, :ok, {config, count}}

  end



  # Private



  defp tick({config, count}) do

    config[:render_frame].(count)



    # This timer is automatically cancelled when the server goes away.

    interval = config[:interval]

    Process.send_after(self, :tick, interval)



    {config, count + 1}

  end

end