progress_bar.rb

require 'ruby-progressbar'

image_file_size = File.size(image_file_size)
if File.size(image_url) > 0
progress_bar = ProgressBar.create(:title => "Uploading...",
                                         :starting_at => 0,
                                         :total => image_file_size,
                                         :output => $stderr,
                                         :format => '%a |%b>>%i| %p%% %t'
                                        )
end

progress_proc: proc do |step|
  progress_bar.progress = step
end