How to load global gems not defined in a Gemfile...

.irbrc

begin
  # Blerg. Mess global gems into the load path. This doesn't work for all gems.
  # But it's good enough for basic irb gems.
  if defined?(::Bundler)
    global_gemset = ENV['GEM_PATH'].split(':').grep(/ruby.*@global/).first
    if global_gemset
      all_global_gem_paths = Dir.glob("#{global_gemset}/gems/*")
      all_global_gem_paths.each do |p|
        gem_path = "#{p}/lib"
        $LOAD_PATH << gem_path
      end
    end
  end

  require "awesome_print"

  IRB::Irb.class_eval do
    def output_value
      ap @context.last_value
    end
  end

rescue Exception => e
  warn "Error loading irbrc: #{e}"
end