View Source for Ruby

gistfile1.rb

# Toss this in your ~/.irbrc file for a convenient way
# to peruse Ruby source code in Emacs.app. This
# only works in Ruby 1.9!
#
# Use it in irb like so:
#
# >> require 'active_record'
# >> ActiveRecord::Base.source_for_method(:create)

class Object
  def source_for_method(method)
    location = self.method(method).source_location
    `/Applications/Emacs.app/Contents/MacOS/bin/emacsclient +#{location[1]} #{location[0]}` if location
    location
  end
end