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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.ex
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lib/progress_bar.ex 

defmodule ProgressBar do

  @default_format [

    bar: "=",

    blank: " ",

    left: "|",

    right: "|",

    percent: true,

  ]



  def render(current..total, custom_format \\ @default_format) do

    format = Keyword.merge(@default_format, custom_format)



    bar = String.duplicate(format[:bar], current)

    blank = String.duplicate(format[:blank], total - current)



    IO.write [

      "\r",

      format[:left],

      bar,

      blank,

      format[:right],

      formatted_percent(format[:percent], current, total),

    ]

  end



  def done do

    IO.write "\n"

  end



  # Private



  defp formatted_percent(false, _current, _total), do: ""

  defp formatted_percent(true, current, total) do

    percent = current / total * 100

    pretty = percent |> Float.round |> trunc |> Integer.to_string

    " " <> String.rjust(pretty, 3) <> "%"

  end

end