#-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ module Kernel if defined?(gem_original_require) then # Ruby ships with a custom_require, override its require remove_method :require else ## # The Kernel#require from before RubyGems was loaded. alias gem_original_require require private :gem_original_require end ## # When RubyGems is required, Kernel#require is replaced with our own which # is capable of loading gems on demand. # # When you call require 'x', this is what happens: # * If the file can be loaded from the existing Ruby loadpath, it # is. # * Otherwise, installed gems are searched for a file that matches. # If it's found in gem 'y', that gem is activated (added to the # loadpath). # # The normal require functionality of returning false if # that file has already been loaded is preserved. def require path if Gem.unresolved_deps.empty? then gem_original_require path else spec = Gem::Specification.find { |s| s.activated? and s.contains_requirable_file? path } unless spec then found_specs = Gem::Specification.find_in_unresolved path unless found_specs.empty? then found_specs = [found_specs.last] else found_specs = Gem::Specification.find_in_unresolved_tree path end found_specs.each do |found_spec| found_spec.activate end end return gem_original_require path end rescue LoadError => load_error if load_error.message.start_with?("Could not find") or (load_error.message.end_with?(path) and Gem.try_activate(path)) then return gem_original_require(path) end raise load_error end private :require end