Progressbar Implementation about down

[huseyin]

I figured out how to implement progress bar and my solution is as follows.

progressbar = ProgressBar.create(title: 'File')
url = 'https://example.com'
total_size = 0

Down.download(
  url,
  content_length_proc: ->(content_length) { total_size = content_length },
  progress_proc: lambda do |progress|
    break if progress == total_size

    progressbar.progress = (progress.to_f / total_size) * 100
  end
)

I hope this helps everybody who wants to fork. I'm closing the issue.