my .irbrc file

.irbrc.rb

# rubygems
require 'rubygems'

# active_support from rails
require 'active_support' unless ENV['RAILS_ENV']

# wirble -- colors + more
require 'wirble'
module Wirble::Colorize::Color
  class << self
    def brighten(s)
      s.sub(/^(\d);3(\d)$/, "\\1;9\\2") # replaces X;3Y with X;9Y
    end

    def escape_with_brightening(key)
      COLORS.key?(key) && "\033[#{Wirble::Colorize::Color.brighten(COLORS[key])}m" 
    end
    alias_method :escape_without_brightening, :escape
    alias_method :escape, :escape_with_brightening   
  end       
end
colors = Wirble::Colorize.colors.merge({
  # delimiter colors
  :comma              => :green,
  :refers             => :green,

  # container colors (hash and array)
  :open_hash          => :green,
  :close_hash         => :green,
  :open_array         => :green,
  :close_array        => :green,

  # object colors
  :open_object        => :light_red,
  :object_class       => :white,
  :object_addr_prefix => :white,
  :object_line_prefix => :white,
  :close_object       => :light_red,

  # symbol colors
  :symbol             => :yellow,
  :symbol_prefix      => :yellow,

  # string colors
  :open_string        => :red,
  :string             => :cyan,
  :close_string       => :red,

  # misc colors
  :number             => :cyan,
  :keyword            => :green,
  :class              => :light_green,
  :range              => :red,
})
Wirble::Colorize.colors = colors
Wirble.init
Wirble.colorize

# tab completion
require 'irb/completion'
require 'map_by_method'
require 'what_methods'
IRB.conf[:USE_READLINE] = true

# pretty print
require 'pp'

# misc. irb settings
IRB.conf[:AUTO_INDENT] = true
IRB.conf[:PROMPT_MODE] = :SIMPLE

# easily print methods local to an object's class
class Object
  def local_methods
    (methods - Object.instance_methods).sort
  end
end

# rails specific
if rails_env = ENV['RAILS_ENV']
  require 'hirb'
  Hirb::View.enable

  # Called after the irb session is initialized and Rails has
  # been loaded (props: Mike Clark).
  if ENV['SC_LOG'] == 'true' && !Object.const_defined?('RAILS_DEFAULT_LOGGER')
    require 'logger'
    puts "- Logging to STDOUT"
    RAILS_DEFAULT_LOGGER = Logger.new(STDOUT)
  end

  # Shortcut to reset
  def reset
    Dispatcher.reset_application!
  end
end