gistfile1.rb

unless ENV["BUNDLE_GEMFILE"] then
  if $stdout.tty? # Only do an interactive "do you really want to" if we're in an interactive session
    require 'timeout'
    Timeout.timeout 30 do
      puts "\e[1;41m WARNING \e[0;41mYou're running `#{$0}` instead of `bundle exec #{$0}` \e[0m"
      print "Proceed? [yN] "
      $stdout.flush
      abort "Terminated" unless $stdin.gets.chomp =~ /\Ay(?:es)?\z/i
    end
  else # not interactive, just terminate with a non-zero status
    puts "You're running `#{$0}` instead of `bundle exec #{$0}`"
    exit! 1
  end
end