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Diffstat (limited to 'trunk/lib/rubygems/custom_require.rb')
-rwxr-xr-x | trunk/lib/rubygems/custom_require.rb | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/trunk/lib/rubygems/custom_require.rb b/trunk/lib/rubygems/custom_require.rb new file mode 100755 index 0000000000..90e6b53959 --- /dev/null +++ b/trunk/lib/rubygems/custom_require.rb @@ -0,0 +1,38 @@ +#-- +# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. +# All rights reserved. +# See LICENSE.txt for permissions. +#++ + +require 'rubygems' + +module Kernel + alias gem_original_require require # :nodoc: + + # + # We replace Ruby's require 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) # :nodoc: + gem_original_require path + rescue LoadError => load_error + if load_error.message =~ /#{Regexp.escape path}\z/ and + spec = Gem.searcher.find(path) then + Gem.activate(spec.name, "= #{spec.version}") + gem_original_require path + else + raise load_error + end + end +end # module Kernel + |