my .irbrc file

require 'irb/completion'
IRB.conf[:AUTO_INDENT] = true
IRB.conf[:USE_READLINE] = true
IRB.conf[:PROMPT_MODE] = :SIMPLE

\# call ri from within irb
def ri(*names)
  system(%{ri.bat #{names.map {|name| name.to_s}.join(" ")}})
end