IRB customization: load wirble, looksee and awesome_print; cheat bundler

.irbrc

require 'rubygems'

@irb_extensions = []

def require_with_bundler_fallback(gem_name, load_file = nil)
  load_file ||= gem_name
  begin
    require load_file
  rescue LoadError => e
    gem_paths = []
    Gem.path.each do |sys_gem_path|
      Dir[sys_gem_path + '/gems/*'].each do |gem_path|
        gem_paths << gem_path if %r{#{gem_name}} =~ gem_path
      end
    end

    if gem_paths.empty?
      error = LoadError.new("It seems like #{gem_name} is not installed.")
      class << error; def skip_backtrace?; true; end; end
      raise error
    end

    $:.unshift File.join(gem_paths.sort_by(&:to_s).last, "lib")
    require load_file
  end

  yield if block_given?

  @irb_extensions << gem_name
rescue Exception => err
  msg = "Couldn't load #{gem_name}: #{err}"
  msg << "\n#{err.backtrace[0..10].join("\n")}" unless err.respond_to?(:skip_backtrace?) && err.skip_backtrace?
  warn msg
end


require_with_bundler_fallback 'wirble' do
  require 'wirble'
  Wirble.init

  colors = Wirble::Colorize.colors.merge({
    :string => :red
  })

  Wirble::Colorize.colors = colors

  Wirble.colorize
end

require_with_bundler_fallback 'looksee' do
  Looksee.default_width = 160
end

require_with_bundler_fallback 'awesome_print', 'ap'