Gem.active?

gem_extensions.rb

# Gem.active?, Gem.gemspec and Gem.gempath.
# These are RubyGems extensions I created a while back.
# I'm not sure how relevant they are any longer however.
# Does RubyGems now have other means to do these?

module Gem

  def self.active?(gemname)
    @loaded_specs ||= Hash.new
    @loaded_specs.key? gemname
  end

  def self.gemspec(gemname)
    @loaded_specs[gemname] if active?(gemname)
  end

  def self.gempath(gemname, subdir=nil)
    if active?(gemname)
      if subdir
        File.join( @loaded_specs[gemname].full_gem_path, subdir )
      else
        @loaded_specs[gemname].full_gem_path
      end
    end
  end

end