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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 indeterminate.ex
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lib/progress_bar/indeterminate.ex 

defmodule ProgressBar.Indeterminate do

  @default_format [

    bars: ["=---", "-=--", "--=-", "---="],

    done: "=",

    left: "|",

    right: "|",

    bars_color: [],

    done_color: [],

    interval: 500,

    width: :auto,

  ]



  def render(custom_format \\ @default_format, fun) do

    format = Keyword.merge(@default_format, custom_format)



    config = [

      interval: format[:interval],

      render_frame: fn (count) -> render_frame(format, count) end,

      render_done:  fn -> render_done(format) end,

    ]



    ProgressBar.AnimationServer.start(config)

    value = fun.()

    ProgressBar.AnimationServer.stop

    value

  end



  defp render_frame(format, count) do

    parts = format[:bars]

    index = rem(count, length(parts))

    part = Enum.at(parts, index)



    ProgressBar.BarFormatter.write(

      format,

      {part, format[:bars_color]},

      ""

    )

  end



  defp render_done(format) do

    ProgressBar.BarFormatter.write(

      format,

      {format[:done], format[:done_color]},

      "\n"

    )

  end

end