Ruby - is the file being run directly

ruby_file_run_directly.rb

# http://stackoverflow.com/questions/582686/should-i-define-a-main-method-in-my-ruby-scripts/582694#582694
# Detect if the file is being run directly.
#if __FILE__ == $PROGRAM_NAME
if __FILE__ == $0
  x = SweetClass.new(ARGV)
  x.run # or go, or whatever
end

Thanks for sharing. Exactly what I was looking for.