# File lib/rubygems/user_interaction.rb, line 174 def ask_yes_no(question, default=nil) unless tty? then if default.nil? then raise Gem::OperationNotSupportedError, "Not connected to a tty and no default specified" else return default end end default_answer = case default when nil 'yn' when true 'Yn' else 'yN' end result = nil while result.nil? do result = case ask "#{question} [#{default_answer}]" when /^y/i then true when /^n/i then false when /^$/ then default else nil end end return result end