My irb customization file

.irbrc

require 'rubygems'

irb_extensions = []

begin
  # load wirble
  require 'wirble'

  # start wirble (with color)
  Wirble.init
  Wirble.colorize

  irb_extensions << "Wirble"

rescue LoadError => err
  warn "Couldn't load Wirble: #{err}"
end

class Object
  def xmethods
    (self.methods - Object.new.methods).sort
  end
end

irb_extensions << "Object#xmethods"


puts "Custom irb extensions: #{irb_extensions.join(', ')}" unless irb_extensions.empty?