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#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
module Kernel
##
# The Kernel#require from before RubyGems was loaded.
alias gem_original_require require
##
# When RubyGems is required, Kernel#require is replaced with our own which
# is capable of loading gems on demand.
#
# When you call <tt>require 'x'</tt>, 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 <tt>require</tt> functionality of returning false if
# that file has already been loaded is preserved.
def require(path) # :doc:
gem_original_require path
rescue LoadError => load_error
if load_error.message.end_with?(path) and
begin
Gem.try_activate(path)
rescue Gem::LoadError => load_error
pat = "#{__FILE__}:#{__LINE__-2}:in "
bt = load_error.backtrace
num = bt.index {|e| e.start_with?(pat)} and bt.shift(num+2)
raise load_error
end
retry
else
load_error.backtrace.shift(2)
raise load_error
end
end
private :require
private :gem_original_require
end unless Kernel.private_method_defined?(:gem_original_require)
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