# File lib/rubygems/user_interaction.rb, line 168 def ask_yes_no(question, default=nil) unless @ins.tty? then if default.nil? then raise Gem::OperationNotSupportedError, "Not connected to a tty and no default specified" else return default end end qstr = case default when nil 'yn' when true 'Yn' else 'yN' end result = nil while result.nil? result = ask("#{question} [#{qstr}]") result = case result when /^[Yy].*/ true when /^[Nn].*/ false when /^$/ default else nil end end return result end