Ruby CLI Progress Indicators

progress_indicators.rb

# Terminal Progress Indicators. Four examples are included: percentage,
# spinner, progress bar, and combined. This script has been tested on
# Mac OS X 10.8 with Ruby 1.8.7, 1.9.1, 1.9.2, and 1.9.3

class Spinner
  include Enumerable
  def each
    loop do
      yield '|'
      yield '/'
      yield '-'
      yield '\\'
    end
  end
end

spinner = Spinner.new.enum_for(:each)
$stdout.sync = true

# Example 1: percentage
1.upto(100) do |i|
 printf("\rPercentage: %d%", i)
 sleep(0.05)
end
puts

# Example 2: spinner
1.upto(100) do |i|
  printf("\rSpinner: %s", spinner.next)
  sleep(0.05)
end
puts

# Example 3: progress bar
0.step(100, 5) do |i|
  printf("\rProgress Bar: [%-20s]", "=" * (i/5).floor)
  sleep(0.05)
end
puts

# Example 4: combined
1.upto(100) do |i|
  printf("\rCombined: [%-20s] %d%% %s", "=" * (i/5).floor, i, spinner.next)
  sleep(0.05)
end
puts

you need to include enumerable at the top (for 1.9.2 and 1.9.3)

include Enumerable
#....

I've updated the gist so that it works with Ruby 1.8.7, 1.9.1, 1.9.2, and 1.9.3