Different style progress bars in Ruby

progress_bar.rb

require 'net/http'
require 'uri'

uri = URI.parse 'http://www.mirrorservice.org/sites/ftp.archlinux.org/iso/2017.11.01/archlinux-2017.11.01-x86_64.iso'
uri = URI.parse 'http://ipv4.download.thinkbroadband.com/10MB.zip'

download = File.basename uri.path

#spin_states = %w{ - \\ | / Done! }  # Traditional line spinner
#spin_states = %w{ /^v^\\ \\^v^/ \\ovo/ } # Happy bats
#spin_states = %w{ ⠁ ⠂ ⠄ ⡀ ⢀ ⠠ ⠐ ⠈ ✓ } # Rectangle trace
#spin_states = %w{ ← ↖ ↑ ↗ → ↘ ↓ ↙  ✓ } # Arrows
spin_states = %w{ ▁ ▂ ▃ ▄ ▅ ▆ ▇ █ ▇ ▆ ▅ ▄ ▃ ▁ ✓ } # Grow shrink
#spin_states = %w{ ▉ ▊ ▋ ▌ ▍ ▎ ▏ ▎ ▍ ▌ ▋ ▊ ▉ ✓ } # Thin and fat
#spin_states = %w{ ┤ ┘ ┴ └ ├ ┌ ┬ ┐ ✓ } # Folding lines
#spin_states = %w{ ⣾ ⣽ ⣻ ⢿ ⡿ ⣟ ⣯ ⣷ ⣿ } # Braille arranger
#spin_states = %w{ ⠖ ⠲ ⠴ ⠦ ⠶ }       # Braille spinner
update_every = 0.125
spin_speed = 1 # 0 < speed <= 1 (1 is once every update)


MiB = 1.049e+6

Net::HTTP.start uri.host, uri.port do |http|
  request = Net::HTTP::Get.new uri.request_uri

  http.request request do |response|
    size = response['Content-Length'].to_i

    done = state = 0
    bar_offset = 10 + spin_states.max_by(&:size).size
      # There are 10 extra chars next to the progress bar,
      #   adding on the widest element in bar_offset

    start = Time.now.to_f
    open download, 'w' do |io|
      show_progress = Proc.new do |frequency, preset=nil|
        Thread.new do
          while true
            thread = Thread.current

            if preset.nil?
              done = thread[:done]
            else
              done = preset
            end

            bar_length = %x{ tput cols }.to_i - bar_offset
            percentage = 100 * done / size
            bar_ratio  = bar_length * done / size
            
            print "\r"
            stats = "'#{download}' — " + ('%.2f' % (done / MiB)).rjust((size / MiB).round(2).to_s.size, ' ') +
            ' / ' + (size / MiB).round(2).to_s + ' MiB' +
            ' at ' + ('%.2f MiB/s' % ((done / MiB) / (Time.now.to_f - start)).round(2)) +
            ' in %.2fs' % (Time.now.to_f - start)
            
            short_stats = stats.slice 0..(bar_length + bar_offset - 4)
            print short_stats, stats.size == short_stats.size ? '' : '...', "\n"
            # 3 dots and -1 for index correction
            print "\r#{percentage == 100 ? spin_states[-1] : spin_states[state.to_i]} [ #{'█' * bar_ratio}#{'▒' * (bar_length - bar_ratio)} ] #{percentage.to_s.rjust 3, ' '}%"
            print "\033[F"

            state += spin_speed
            state = 0 if state >= spin_states.size - 1
            Thread.stop if percentage == 100
            sleep frequency
          end
        end
      end
      
      done = 0
      thread = nil
      first_response = true
      response.read_body do |chunk|
        io.write chunk

        if first_response
          thread = show_progress.call update_every
        end

        done += chunk.size
        thread[:done] = done unless thread.nil?
        first_response = false
      end
      
      thread = show_progress.call 0, preset=size
      # Make sure the progress bar finishes
    end
  end
end
sleep 0.3
# Make sure all threads are completly dead
puts "\n\n"

puts "\n#{download}, downloaded!"