Fresh start

1 files changed, 1245 insertions, 0 deletions

diff --git a/jni/ruby/lib/rubygems.rb b/jni/ruby/lib/rubygems.rb
new file mode 100644
index 0000000..98e7dfa
--- /dev/null
+++ b/jni/ruby/lib/rubygems.rb
@@ -0,0 +1,1245 @@
+# -*- ruby -*-
+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'rbconfig'
+require 'thread'
+
+module Gem
+  VERSION = '2.4.5.1'
+end
+
+# Must be first since it unloads the prelude from 1.9.2
+require 'rubygems/compatibility'
+
+require 'rubygems/defaults'
+require 'rubygems/deprecate'
+require 'rubygems/errors'
+
+##
+# RubyGems is the Ruby standard for publishing and managing third party
+# libraries.
+#
+# For user documentation, see:
+#
+# * <tt>gem help</tt> and <tt>gem help [command]</tt>
+# * {RubyGems User Guide}[http://docs.rubygems.org/read/book/1]
+# * {Frequently Asked Questions}[http://docs.rubygems.org/read/book/3]
+#
+# For gem developer documentation see:
+#
+# * {Creating Gems}[http://docs.rubygems.org/read/chapter/5]
+# * Gem::Specification
+# * Gem::Version for version dependency notes
+#
+# Further RubyGems documentation can be found at:
+#
+# * {RubyGems Guides}[http://guides.rubygems.org]
+# * {RubyGems API}[http://rubygems.rubyforge.org/rdoc] (also available from
+#   <tt>gem server</tt>)
+#
+# == RubyGems Plugins
+#
+# As of RubyGems 1.3.2, RubyGems will load plugins installed in gems or
+# $LOAD_PATH.  Plugins must be named 'rubygems_plugin' (.rb, .so, etc) and
+# placed at the root of your gem's #require_path.  Plugins are discovered via
+# Gem::find_files then loaded.  Take care when implementing a plugin as your
+# plugin file may be loaded multiple times if multiple versions of your gem
+# are installed.
+#
+# For an example plugin, see the graph gem which adds a `gem graph` command.
+#
+# == RubyGems Defaults, Packaging
+#
+# RubyGems defaults are stored in rubygems/defaults.rb.  If you're packaging
+# RubyGems or implementing Ruby you can change RubyGems' defaults.
+#
+# For RubyGems packagers, provide lib/rubygems/defaults/operating_system.rb
+# and override any defaults from lib/rubygems/defaults.rb.
+#
+# For Ruby implementers, provide lib/rubygems/defaults/#{RUBY_ENGINE}.rb and
+# override any defaults from lib/rubygems/defaults.rb.
+#
+# If you need RubyGems to perform extra work on install or uninstall, your
+# defaults override file can set pre and post install and uninstall hooks.
+# See Gem::pre_install, Gem::pre_uninstall, Gem::post_install,
+# Gem::post_uninstall.
+#
+# == Bugs
+#
+# You can submit bugs to the
+# {RubyGems bug tracker}[https://github.com/rubygems/rubygems/issues]
+# on GitHub
+#
+# == Credits
+#
+# RubyGems is currently maintained by Eric Hodel.
+#
+# RubyGems was originally developed at RubyConf 2003 by:
+#
+# * Rich Kilmer  -- rich(at)infoether.com
+# * Chad Fowler  -- chad(at)chadfowler.com
+# * David Black  -- dblack(at)wobblini.net
+# * Paul Brannan -- paul(at)atdesk.com
+# * Jim Weirich   -- jim(at)weirichhouse.org
+#
+# Contributors:
+#
+# * Gavin Sinclair     -- gsinclair(at)soyabean.com.au
+# * George Marrows     -- george.marrows(at)ntlworld.com
+# * Dick Davies        -- rasputnik(at)hellooperator.net
+# * Mauricio Fernandez -- batsman.geo(at)yahoo.com
+# * Simon Strandgaard  -- neoneye(at)adslhome.dk
+# * Dave Glasser       -- glasser(at)mit.edu
+# * Paul Duncan        -- pabs(at)pablotron.org
+# * Ville Aine         -- vaine(at)cs.helsinki.fi
+# * Eric Hodel         -- drbrain(at)segment7.net
+# * Daniel Berger      -- djberg96(at)gmail.com
+# * Phil Hagelberg     -- technomancy(at)gmail.com
+# * Ryan Davis         -- ryand-ruby(at)zenspider.com
+# * Evan Phoenix       -- evan(at)fallingsnow.net
+# * Steve Klabnik      -- steve(at)steveklabnik.com
+#
+# (If your name is missing, PLEASE let us know!)
+#
+# See {LICENSE.txt}[rdoc-ref:lib/rubygems/LICENSE.txt] for permissions.
+#
+# Thanks!
+#
+# -The RubyGems Team
+
+
+module Gem
+  RUBYGEMS_DIR = File.dirname File.expand_path(__FILE__)
+
+  ##
+  # An Array of Regexps that match windows Ruby platforms.
+
+  WIN_PATTERNS = [
+    /bccwin/i,
+    /cygwin/i,
+    /djgpp/i,
+    /mingw/i,
+    /mswin/i,
+    /wince/i,
+  ]
+
+  GEM_DEP_FILES = %w[
+    gem.deps.rb
+    Gemfile
+    Isolate
+  ]
+
+  ##
+  # Subdirectories in a gem repository
+
+  REPOSITORY_SUBDIRECTORIES = %w[
+    build_info
+    cache
+    doc
+    extensions
+    gems
+    specifications
+  ]
+
+  ##
+  # Subdirectories in a gem repository for default gems
+
+  REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES = %w[
+    gems
+    specifications/default
+  ]
+
+  @@win_platform = nil
+
+  @configuration = nil
+  @loaded_specs = {}
+  LOADED_SPECS_MUTEX = Mutex.new
+  @path_to_default_spec_map = {}
+  @platforms = []
+  @ruby = nil
+  @ruby_api_version = nil
+  @sources = nil
+
+  @post_build_hooks     ||= []
+  @post_install_hooks   ||= []
+  @post_uninstall_hooks ||= []
+  @pre_uninstall_hooks  ||= []
+  @pre_install_hooks    ||= []
+  @pre_reset_hooks      ||= []
+  @post_reset_hooks     ||= []
+
+  ##
+  # Try to activate a gem containing +path+. Returns true if
+  # activation succeeded or wasn't needed because it was already
+  # activated. Returns false if it can't find the path in a gem.
+
+  def self.try_activate path
+    # finds the _latest_ version... regardless of loaded specs and their deps
+    # if another gem had a requirement that would mean we shouldn't
+    # activate the latest version, then either it would already be activated
+    # or if it was ambiguous (and thus unresolved) the code in our custom
+    # require will try to activate the more specific version.
+
+    spec = Gem::Specification.find_inactive_by_path path
+
+    unless spec
+      spec = Gem::Specification.find_by_path path
+      return true if spec && spec.activated?
+      return false
+    end
+
+    begin
+      spec.activate
+    rescue Gem::LoadError # this could fail due to gem dep collisions, go lax
+      Gem::Specification.find_by_name(spec.name).activate
+    end
+
+    return true
+  end
+
+  def self.needs
+    rs = Gem::RequestSet.new
+
+    yield rs
+
+    finish_resolve rs
+  end
+
+  def self.finish_resolve(request_set=Gem::RequestSet.new)
+    request_set.import Gem::Specification.unresolved_deps.values
+
+    request_set.resolve_current.each do |s|
+      s.full_spec.activate
+    end
+  end
+
+  ##
+  # Find the full path to the executable for gem +name+.  If the +exec_name+
+  # is not given, the gem's default_executable is chosen, otherwise the
+  # specified executable's path is returned.  +requirements+ allows
+  # you to specify specific gem versions.
+
+  def self.bin_path(name, exec_name = nil, *requirements)
+    # TODO: fails test_self_bin_path_bin_file_gone_in_latest
+    # Gem::Specification.find_by_name(name, *requirements).bin_file exec_name
+
+    raise ArgumentError, "you must supply exec_name" unless exec_name
+
+    requirements = Gem::Requirement.default if
+      requirements.empty?
+
+    dep = Gem::Dependency.new name, requirements
+
+    loaded = Gem.loaded_specs[name]
+
+    return loaded.bin_file exec_name if loaded && dep.matches_spec?(loaded)
+
+    specs = dep.matching_specs(true)
+
+    raise Gem::GemNotFoundException,
+          "can't find gem #{name} (#{requirements})" if specs.empty?
+
+    specs = specs.find_all { |spec|
+      spec.executables.include? exec_name
+    } if exec_name
+
+    unless spec = specs.last
+      msg = "can't find gem #{name} (#{requirements}) with executable #{exec_name}"
+      raise Gem::GemNotFoundException, msg
+    end
+
+    spec.bin_file exec_name
+  end
+
+  ##
+  # The mode needed to read a file as straight binary.
+
+  def self.binary_mode
+    'rb'
+  end
+
+  ##
+  # The path where gem executables are to be installed.
+
+  def self.bindir(install_dir=Gem.dir)
+    return File.join install_dir, 'bin' unless
+      install_dir.to_s == Gem.default_dir.to_s
+    Gem.default_bindir
+  end
+
+  ##
+  # Reset the +dir+ and +path+ values.  The next time +dir+ or +path+
+  # is requested, the values will be calculated from scratch.  This is
+  # mainly used by the unit tests to provide test isolation.
+
+  def self.clear_paths
+    @paths         = nil
+    @user_home     = nil
+    Gem::Specification.reset
+    Gem::Security.reset if defined?(Gem::Security)
+  end
+
+  ##
+  # The path to standard location of the user's .gemrc file.
+
+  def self.config_file
+    @config_file ||= File.join Gem.user_home, '.gemrc'
+  end
+
+  ##
+  # The standard configuration object for gems.
+
+  def self.configuration
+    @configuration ||= Gem::ConfigFile.new []
+  end
+
+  ##
+  # Use the given configuration object (which implements the ConfigFile
+  # protocol) as the standard configuration object.
+
+  def self.configuration=(config)
+    @configuration = config
+  end
+
+  ##
+  # The path to the data directory specified by the gem name.  If the
+  # package is not available as a gem, return nil.
+
+  def self.datadir(gem_name)
+# TODO: deprecate and move to Gem::Specification
+#       and drop the extra ", gem_name" which is uselessly redundant
+    spec = @loaded_specs[gem_name]
+    return nil if spec.nil?
+    File.join spec.full_gem_path, "data", gem_name
+  end
+
+  ##
+  # A Zlib::Deflate.deflate wrapper
+
+  def self.deflate(data)
+    require 'zlib'
+    Zlib::Deflate.deflate data
+  end
+
+  # Retrieve the PathSupport object that RubyGems uses to
+  # lookup files.
+
+  def self.paths
+    @paths ||= Gem::PathSupport.new
+  end
+
+  # Initialize the filesystem paths to use from +env+.
+  # +env+ is a hash-like object (typically ENV) that
+  # is queried for 'GEM_HOME', 'GEM_PATH', and 'GEM_SPEC_CACHE'
+
+  def self.paths=(env)
+    clear_paths
+    @paths = Gem::PathSupport.new env
+    Gem::Specification.dirs = @paths.path
+  end
+
+  ##
+  # The path where gems are to be installed.
+  #--
+  # FIXME deprecate these once everything else has been done -ebh
+
+  def self.dir
+    paths.home
+  end
+
+  def self.path
+    paths.path
+  end
+
+  def self.spec_cache_dir
+    paths.spec_cache_dir
+  end
+
+  ##
+  # Quietly ensure the Gem directory +dir+ contains all the proper
+  # subdirectories.  If we can't create a directory due to a permission
+  # problem, then we will silently continue.
+  #
+  # If +mode+ is given, missing directories are created with this mode.
+  #
+  # World-writable directories will never be created.
+
+  def self.ensure_gem_subdirectories dir = Gem.dir, mode = nil
+    ensure_subdirectories(dir, mode, REPOSITORY_SUBDIRECTORIES)
+  end
+
+  ##
+  # Quietly ensure the Gem directory +dir+ contains all the proper
+  # subdirectories for handling default gems.  If we can't create a
+  # directory due to a permission problem, then we will silently continue.
+  #
+  # If +mode+ is given, missing directories are created with this mode.
+  #
+  # World-writable directories will never be created.
+
+  def self.ensure_default_gem_subdirectories dir = Gem.dir, mode = nil
+    ensure_subdirectories(dir, mode, REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES)
+  end
+
+  def self.ensure_subdirectories dir, mode, subdirs # :nodoc:
+    old_umask = File.umask
+    File.umask old_umask | 002
+
+    require 'fileutils'
+
+    options = {}
+
+    options[:mode] = mode if mode
+
+    subdirs.each do |name|
+      subdir = File.join dir, name
+      next if File.exist? subdir
+      FileUtils.mkdir_p subdir, options rescue nil
+    end
+  ensure
+    File.umask old_umask
+  end
+
+  ##
+  # The extension API version of ruby.  This includes the static vs non-static
+  # distinction as extensions cannot be shared between the two.
+
+  def self.extension_api_version # :nodoc:
+    if 'no' == RbConfig::CONFIG['ENABLE_SHARED'] then
+      "#{ruby_api_version}-static"
+    else
+      ruby_api_version
+    end
+  end
+
+  ##
+  # Returns a list of paths matching +glob+ that can be used by a gem to pick
+  # up features from other gems.  For example:
+  #
+  #   Gem.find_files('rdoc/discover').each do |path| load path end
+  #
+  # if +check_load_path+ is true (the default), then find_files also searches
+  # $LOAD_PATH for files as well as gems.
+  #
+  # Note that find_files will return all files even if they are from different
+  # versions of the same gem.  See also find_latest_files
+
+  def self.find_files(glob, check_load_path=true)
+    files = []
+
+    files = find_files_from_load_path glob if check_load_path
+
+    files.concat Gem::Specification.map { |spec|
+      spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
+    }.flatten
+
+    # $LOAD_PATH might contain duplicate entries or reference
+    # the spec dirs directly, so we prune.
+    files.uniq! if check_load_path
+
+    return files
+  end
+
+  def self.find_files_from_load_path glob # :nodoc:
+    $LOAD_PATH.map { |load_path|
+      Dir["#{File.expand_path glob, load_path}#{Gem.suffix_pattern}"]
+    }.flatten.select { |file| File.file? file.untaint }
+  end
+
+  ##
+  # Returns a list of paths matching +glob+ from the latest gems that can be
+  # used by a gem to pick up features from other gems.  For example:
+  #
+  #   Gem.find_latest_files('rdoc/discover').each do |path| load path end
+  #
+  # if +check_load_path+ is true (the default), then find_latest_files also
+  # searches $LOAD_PATH for files as well as gems.
+  #
+  # Unlike find_files, find_latest_files will return only files from the
+  # latest version of a gem.
+
+  def self.find_latest_files(glob, check_load_path=true)
+    files = []
+
+    files = find_files_from_load_path glob if check_load_path
+
+    files.concat Gem::Specification.latest_specs(true).map { |spec|
+      spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
+    }.flatten
+
+    # $LOAD_PATH might contain duplicate entries or reference
+    # the spec dirs directly, so we prune.
+    files.uniq! if check_load_path
+
+    return files
+  end
+
+  ##
+  # Finds the user's home directory.
+  #--
+  # Some comments from the ruby-talk list regarding finding the home
+  # directory:
+  #
+  #   I have HOME, USERPROFILE and HOMEDRIVE + HOMEPATH. Ruby seems
+  #   to be depending on HOME in those code samples. I propose that
+  #   it should fallback to USERPROFILE and HOMEDRIVE + HOMEPATH (at
+  #   least on Win32).
+  #++
+  #--
+  #
+  # FIXME move to pathsupport
+  #
+  #++
+
+  def self.find_home
+    windows = File::ALT_SEPARATOR
+    if not windows or RUBY_VERSION >= '1.9' then
+      File.expand_path "~"
+    else
+      ['HOME', 'USERPROFILE'].each do |key|
+        return File.expand_path ENV[key] if ENV[key]
+      end
+
+      if ENV['HOMEDRIVE'] && ENV['HOMEPATH'] then
+        File.expand_path "#{ENV['HOMEDRIVE']}#{ENV['HOMEPATH']}"
+      end
+    end
+  rescue
+    if windows then
+      File.expand_path File.join(ENV['HOMEDRIVE'] || ENV['SystemDrive'], '/')
+    else
+      File.expand_path "/"
+    end
+  end
+
+  private_class_method :find_home
+
+  # FIXME deprecate these in 3.0
+
+  ##
+  # Zlib::GzipReader wrapper that unzips +data+.
+
+  def self.gunzip(data)
+    require 'rubygems/util'
+    Gem::Util.gunzip data
+  end
+
+  ##
+  # Zlib::GzipWriter wrapper that zips +data+.
+
+  def self.gzip(data)
+    require 'rubygems/util'
+    Gem::Util.gzip data
+  end
+
+  ##
+  # A Zlib::Inflate#inflate wrapper
+
+  def self.inflate(data)
+    require 'rubygems/util'
+    Gem::Util.inflate data
+  end
+
+  ##
+  # Top level install helper method. Allows you to install gems interactively:
+  #
+  #   % irb
+  #   >> Gem.install "minitest"
+  #   Fetching: minitest-3.0.1.gem (100%)
+  #   => [#<Gem::Specification:0x1013b4528 @name="minitest", ...>]
+
+  def self.install name, version = Gem::Requirement.default, *options
+    require "rubygems/dependency_installer"
+    inst = Gem::DependencyInstaller.new(*options)
+    inst.install name, version
+    inst.installed_gems
+  end
+
+  ##
+  # Get the default RubyGems API host. This is normally
+  # <tt>https://rubygems.org</tt>.
+
+  def self.host
+    # TODO: move to utils
+    @host ||= Gem::DEFAULT_HOST
+  end
+
+  ## Set the default RubyGems API host.
+
+  def self.host= host
+    # TODO: move to utils
+    @host = host
+  end
+
+  ##
+  # The index to insert activated gem paths into the $LOAD_PATH. The activated
+  # gem's paths are inserted before site lib directory by default.
+
+  def self.load_path_insert_index
+    index = $LOAD_PATH.index RbConfig::CONFIG['sitelibdir']
+
+    index
+  end
+
+  @yaml_loaded = false
+
+  ##
+  # Loads YAML, preferring Psych
+
+  def self.load_yaml
+    return if @yaml_loaded
+    return unless defined?(gem)
+
+    test_syck = ENV['TEST_SYCK']
+
+    unless test_syck
+      begin
+        gem 'psych', '~> 1.2', '>= 1.2.1'
+      rescue Gem::LoadError
+        # It's OK if the user does not have the psych gem installed.  We will
+        # attempt to require the stdlib version
+      end
+
+      begin
+        # Try requiring the gem version *or* stdlib version of psych.
+        require 'psych'
+      rescue ::LoadError
+        # If we can't load psych, thats fine, go on.
+      else
+        # If 'yaml' has already been required, then we have to
+        # be sure to switch it over to the newly loaded psych.
+        if defined?(YAML::ENGINE) && YAML::ENGINE.yamler != "psych"
+          YAML::ENGINE.yamler = "psych"
+        end
+
+        require 'rubygems/psych_additions'
+        require 'rubygems/psych_tree'
+      end
+    end
+
+    require 'yaml'
+
+    # If we're supposed to be using syck, then we may have to force
+    # activate it via the YAML::ENGINE API.
+    if test_syck and defined?(YAML::ENGINE)
+      YAML::ENGINE.yamler = "syck" unless YAML::ENGINE.syck?
+    end
+
+    # Now that we're sure some kind of yaml library is loaded, pull
+    # in our hack to deal with Syck's DefaultKey ugliness.
+    require 'rubygems/syck_hack'
+
+    @yaml_loaded = true
+  end
+
+  ##
+  # The file name and line number of the caller of the caller of this method.
+
+  def self.location_of_caller
+    caller[1] =~ /(.*?):(\d+).*?$/i
+    file = $1
+    lineno = $2.to_i
+
+    [file, lineno]
+  end
+
+  ##
+  # The version of the Marshal format for your Ruby.
+
+  def self.marshal_version
+    "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
+  end
+
+  ##
+  # Set array of platforms this RubyGems supports (primarily for testing).
+
+  def self.platforms=(platforms)
+    @platforms = platforms
+  end
+
+  ##
+  # Array of platforms this RubyGems supports.
+
+  def self.platforms
+    @platforms ||= []
+    if @platforms.empty?
+      @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
+    end
+    @platforms
+  end
+
+  ##
+  # Adds a post-build hook that will be passed an Gem::Installer instance
+  # when Gem::Installer#install is called.  The hook is called after the gem
+  # has been extracted and extensions have been built but before the
+  # executables or gemspec has been written.  If the hook returns +false+ then
+  # the gem's files will be removed and the install will be aborted.
+
+  def self.post_build(&hook)
+    @post_build_hooks << hook
+  end
+
+  ##
+  # Adds a post-install hook that will be passed an Gem::Installer instance
+  # when Gem::Installer#install is called
+
+  def self.post_install(&hook)
+    @post_install_hooks << hook
+  end
+
+  ##
+  # Adds a post-installs hook that will be passed a Gem::DependencyInstaller
+  # and a list of installed specifications when
+  # Gem::DependencyInstaller#install is complete
+
+  def self.done_installing(&hook)
+    @done_installing_hooks << hook
+  end
+
+  ##
+  # Adds a hook that will get run after Gem::Specification.reset is
+  # run.
+
+  def self.post_reset(&hook)
+    @post_reset_hooks << hook
+  end
+
+  ##
+  # Adds a post-uninstall hook that will be passed a Gem::Uninstaller instance
+  # and the spec that was uninstalled when Gem::Uninstaller#uninstall is
+  # called
+
+  def self.post_uninstall(&hook)
+    @post_uninstall_hooks << hook
+  end
+
+  ##
+  # Adds a pre-install hook that will be passed an Gem::Installer instance
+  # when Gem::Installer#install is called.  If the hook returns +false+ then
+  # the install will be aborted.
+
+  def self.pre_install(&hook)
+    @pre_install_hooks << hook
+  end
+
+  ##
+  # Adds a hook that will get run before Gem::Specification.reset is
+  # run.
+
+  def self.pre_reset(&hook)
+    @pre_reset_hooks << hook
+  end
+
+  ##
+  # Adds a pre-uninstall hook that will be passed an Gem::Uninstaller instance
+  # and the spec that will be uninstalled when Gem::Uninstaller#uninstall is
+  # called
+
+  def self.pre_uninstall(&hook)
+    @pre_uninstall_hooks << hook
+  end
+
+  ##
+  # The directory prefix this RubyGems was installed at. If your
+  # prefix is in a standard location (ie, rubygems is installed where
+  # you'd expect it to be), then prefix returns nil.
+
+  def self.prefix
+    prefix = File.dirname RUBYGEMS_DIR
+
+    if prefix != File.expand_path(RbConfig::CONFIG['sitelibdir']) and
+       prefix != File.expand_path(RbConfig::CONFIG['libdir']) and
+       'lib' == File.basename(RUBYGEMS_DIR) then
+      prefix
+    end
+  end
+
+  ##
+  # Refresh available gems from disk.
+
+  def self.refresh
+    Gem::Specification.reset
+  end
+
+  ##
+  # Safely read a file in binary mode on all platforms.
+
+  def self.read_binary(path)
+    open path, 'rb+' do |f|
+      f.flock(File::LOCK_EX)
+      f.read
+    end
+  rescue Errno::EACCES
+    open path, 'rb' do |f|
+      f.read
+    end
+  end
+
+  ##
+  # The path to the running Ruby interpreter.
+
+  def self.ruby
+    if @ruby.nil? then
+      @ruby = File.join(RbConfig::CONFIG['bindir'],
+                        "#{RbConfig::CONFIG['ruby_install_name']}#{RbConfig::CONFIG['EXEEXT']}")
+
+      @ruby = "\"#{@ruby}\"" if @ruby =~ /\s/
+    end
+
+    @ruby
+  end
+
+  ##
+  # Returns a String containing the API compatibility version of Ruby
+
+  def self.ruby_api_version
+    @ruby_api_version ||= RbConfig::CONFIG['ruby_version'].dup
+  end
+
+  ##
+  # Returns the latest release-version specification for the gem +name+.
+
+  def self.latest_spec_for name
+    dependency   = Gem::Dependency.new name
+    fetcher      = Gem::SpecFetcher.fetcher
+    spec_tuples, = fetcher.spec_for_dependency dependency
+
+    spec, = spec_tuples.first
+
+    spec
+  end
+
+  ##
+  # Returns the latest release version of RubyGems.
+
+  def self.latest_rubygems_version
+    latest_version_for('rubygems-update') or
+      raise "Can't find 'rubygems-update' in any repo. Check `gem source list`."
+  end
+
+  ##
+  # Returns the version of the latest release-version of gem +name+
+
+  def self.latest_version_for name
+    spec = latest_spec_for name
+    spec and spec.version
+  end
+
+  ##
+  # A Gem::Version for the currently running Ruby.
+
+  def self.ruby_version
+    return @ruby_version if defined? @ruby_version
+    version = RUBY_VERSION.dup
+
+    if defined?(RUBY_PATCHLEVEL) && RUBY_PATCHLEVEL != -1 then
+      version << ".#{RUBY_PATCHLEVEL}"
+    elsif defined?(RUBY_REVISION) then
+      version << ".dev.#{RUBY_REVISION}"
+    end
+
+    @ruby_version = Gem::Version.new version
+  end
+
+  ##
+  # A Gem::Version for the currently running RubyGems
+
+  def self.rubygems_version
+    return @rubygems_version if defined? @rubygems_version
+    @rubygems_version = Gem::Version.new Gem::VERSION
+  end
+
+  ##
+  # Returns an Array of sources to fetch remote gems from. Uses
+  # default_sources if the sources list is empty.
+
+  def self.sources
+    @sources ||= Gem::SourceList.from(default_sources)
+  end
+
+  ##
+  # Need to be able to set the sources without calling
+  # Gem.sources.replace since that would cause an infinite loop.
+  #
+  # DOC: This comment is not documentation about the method itself, it's
+  # more of a code comment about the implementation.
+
+  def self.sources= new_sources
+    if !new_sources
+      @sources = nil
+    else
+      @sources = Gem::SourceList.from(new_sources)
+    end
+  end
+
+  ##
+  # Glob pattern for require-able path suffixes.
+
+  def self.suffix_pattern
+    @suffix_pattern ||= "{#{suffixes.join(',')}}"
+  end
+
+  ##
+  # Suffixes for require-able paths.
+
+  def self.suffixes
+    @suffixes ||= ['',
+                   '.rb',
+                   *%w(DLEXT DLEXT2).map { |key|
+                     val = RbConfig::CONFIG[key]
+                     next unless val and not val.empty?
+                     ".#{val}"
+                   }
+                  ].compact.uniq
+  end
+
+  ##
+  # Prints the amount of time the supplied block takes to run using the debug
+  # UI output.
+
+  def self.time(msg, width = 0, display = Gem.configuration.verbose)
+    now = Time.now
+
+    value = yield
+
+    elapsed = Time.now - now
+
+    ui.say "%2$*1$s: %3$3.3fs" % [-width, msg, elapsed] if display
+
+    value
+  end
+
+  ##
+  # Lazily loads DefaultUserInteraction and returns the default UI.
+
+  def self.ui
+    require 'rubygems/user_interaction'
+
+    Gem::DefaultUserInteraction.ui
+  end
+
+  ##
+  # Use the +home+ and +paths+ values for Gem.dir and Gem.path.  Used mainly
+  # by the unit tests to provide environment isolation.
+
+  def self.use_paths(home, *paths)
+    paths = nil if paths == [nil]
+    paths = paths.first if Array === Array(paths).first
+    self.paths = { "GEM_HOME" => home, "GEM_PATH" => paths }
+  end
+
+  ##
+  # The home directory for the user.
+
+  def self.user_home
+    @user_home ||= find_home.untaint
+  end
+
+  ##
+  # Is this a windows platform?
+
+  def self.win_platform?
+    if @@win_platform.nil? then
+      ruby_platform = RbConfig::CONFIG['host_os']
+      @@win_platform = !!WIN_PATTERNS.find { |r| ruby_platform =~ r }
+    end
+
+    @@win_platform
+  end
+
+  ##
+  # Load +plugins+ as Ruby files
+
+  def self.load_plugin_files plugins # :nodoc:
+    plugins.each do |plugin|
+
+      # Skip older versions of the GemCutter plugin: Its commands are in
+      # RubyGems proper now.
+
+      next if plugin =~ /gemcutter-0\.[0-3]/
+
+      begin
+        load plugin
+      rescue ::Exception => e
+        details = "#{plugin.inspect}: #{e.message} (#{e.class})"
+        warn "Error loading RubyGems plugin #{details}"
+      end
+    end
+  end
+
+  ##
+  # Find the 'rubygems_plugin' files in the latest installed gems and load
+  # them
+
+  def self.load_plugins
+    # Remove this env var by at least 3.0
+    if ENV['RUBYGEMS_LOAD_ALL_PLUGINS']
+      load_plugin_files find_files('rubygems_plugin', false)
+    else
+      load_plugin_files find_latest_files('rubygems_plugin', false)
+    end
+  end
+
+  ##
+  # Find all 'rubygems_plugin' files in $LOAD_PATH and load them
+
+  def self.load_env_plugins
+    path = "rubygems_plugin"
+
+    files = []
+    $LOAD_PATH.each do |load_path|
+      globbed = Dir["#{File.expand_path path, load_path}#{Gem.suffix_pattern}"]
+
+      globbed.each do |load_path_file|
+        files << load_path_file if File.file?(load_path_file.untaint)
+      end
+    end
+
+    load_plugin_files files
+  end
+
+  ##
+  # Looks for a gem dependency file at +path+ and activates the gems in the
+  # file if found.  If the file is not found an ArgumentError is raised.
+  #
+  # If +path+ is not given the RUBYGEMS_GEMDEPS environment variable is used,
+  # but if no file is found no exception is raised.
+  #
+  # If '-' is given for +path+ RubyGems searches up from the current working
+  # directory for gem dependency files (gem.deps.rb, Gemfile, Isolate) and
+  # activates the gems in the first one found.
+  #
+  # You can run this automatically when rubygems starts.  To enable, set
+  # the <code>RUBYGEMS_GEMDEPS</code> environment variable to either the path
+  # of your gem dependencies file or "-" to auto-discover in parent
+  # directories.
+  #
+  # NOTE: Enabling automatic discovery on multiuser systems can lead to
+  # execution of arbitrary code when used from directories outside your
+  # control.
+
+  def self.use_gemdeps path = nil
+    raise_exception = path
+
+    path ||= ENV['RUBYGEMS_GEMDEPS']
+    return unless path
+
+    path = path.dup
+
+    if path == "-" then
+      require 'rubygems/util'
+
+      Gem::Util.traverse_parents Dir.pwd do |directory|
+        dep_file = GEM_DEP_FILES.find { |f| File.file?(f) }
+
+        next unless dep_file
+
+        path = File.join directory, dep_file
+        break
+      end
+    end
+
+    path.untaint
+
+    unless File.file? path then
+      return unless raise_exception
+
+      raise ArgumentError, "Unable to find gem dependencies file at #{path}"
+    end
+
+    rs = Gem::RequestSet.new
+    rs.load_gemdeps path
+
+    rs.resolve_current.map do |s|
+      sp = s.full_spec
+      sp.activate
+      sp
+    end
+  rescue Gem::LoadError, Gem::UnsatisfiableDependencyError => e
+    warn e.message
+    warn "You may need to `gem install -g` to install missing gems"
+    warn ""
+  end
+
+  class << self
+    ##
+    # TODO remove with RubyGems 3.0
+
+    alias detect_gemdeps use_gemdeps # :nodoc:
+  end
+
+  # FIX: Almost everywhere else we use the `def self.` way of defining class
+  # methods, and then we switch over to `class << self` here. Pick one or the
+  # other.
+  class << self
+
+    ##
+    # Hash of loaded Gem::Specification keyed by name
+
+    attr_reader :loaded_specs
+
+    ##
+    # Register a Gem::Specification for default gem.
+    #
+    # Two formats for the specification are supported:
+    #
+    # * MRI 2.0 style, where spec.files contains unprefixed require names.
+    #   The spec's filenames will be registered as-is.
+    # * New style, where spec.files contains files prefixed with paths
+    #   from spec.require_paths. The prefixes are stripped before
+    #   registering the spec's filenames. Unprefixed files are omitted.
+    #
+
+    def register_default_spec(spec)
+      new_format = Gem.default_gems_use_full_paths? || spec.require_paths.any? {|path| spec.files.any? {|f| f.start_with? path } }
+
+      if new_format
+        prefix_group = spec.require_paths.map {|f| f + "/"}.join("|")
+        prefix_pattern = /^(#{prefix_group})/
+      end
+
+      spec.files.each do |file|
+        if new_format
+          file = file.sub(prefix_pattern, "")
+          next unless $~
+        end
+
+        @path_to_default_spec_map[file] = spec
+      end
+    end
+
+    ##
+    # Find a Gem::Specification of default gem from +path+
+
+    def find_unresolved_default_spec(path)
+      Gem.suffixes.each do |suffix|
+        spec = @path_to_default_spec_map["#{path}#{suffix}"]
+        return spec if spec
+      end
+      nil
+    end
+
+    ##
+    # Remove needless Gem::Specification of default gem from
+    # unresolved default gem list
+
+    def remove_unresolved_default_spec(spec)
+      spec.files.each do |file|
+        @path_to_default_spec_map.delete(file)
+      end
+    end
+
+    ##
+    # Clear default gem related variables. It is for test
+
+    def clear_default_specs
+      @path_to_default_spec_map.clear
+    end
+
+    ##
+    # The list of hooks to be run after Gem::Installer#install extracts files
+    # and builds extensions
+
+    attr_reader :post_build_hooks
+
+    ##
+    # The list of hooks to be run after Gem::Installer#install completes
+    # installation
+
+    attr_reader :post_install_hooks
+
+    ##
+    # The list of hooks to be run after Gem::DependencyInstaller installs a
+    # set of gems
+
+    attr_reader :done_installing_hooks
+
+    ##
+    # The list of hooks to be run after Gem::Specification.reset is run.
+
+    attr_reader :post_reset_hooks
+
+    ##
+    # The list of hooks to be run after Gem::Uninstaller#uninstall completes
+    # installation
+
+    attr_reader :post_uninstall_hooks
+
+    ##
+    # The list of hooks to be run before Gem::Installer#install does any work
+
+    attr_reader :pre_install_hooks
+
+    ##
+    # The list of hooks to be run before Gem::Specification.reset is run.
+
+    attr_reader :pre_reset_hooks
+
+    ##
+    # The list of hooks to be run before Gem::Uninstaller#uninstall does any
+    # work
+
+    attr_reader :pre_uninstall_hooks
+  end
+
+  ##
+  # Location of Marshal quick gemspecs on remote repositories
+
+  MARSHAL_SPEC_DIR = "quick/Marshal.#{Gem.marshal_version}/"
+
+  autoload :ConfigFile,         'rubygems/config_file'
+  autoload :Dependency,         'rubygems/dependency'
+  autoload :DependencyList,     'rubygems/dependency_list'
+  autoload :DependencyResolver, 'rubygems/resolver'
+  autoload :Installer,          'rubygems/installer'
+  autoload :PathSupport,        'rubygems/path_support'
+  autoload :Platform,           'rubygems/platform'
+  autoload :RequestSet,         'rubygems/request_set'
+  autoload :Requirement,        'rubygems/requirement'
+  autoload :Resolver,           'rubygems/resolver'
+  autoload :Source,             'rubygems/source'
+  autoload :SourceList,         'rubygems/source_list'
+  autoload :SpecFetcher,        'rubygems/spec_fetcher'
+  autoload :Specification,      'rubygems/specification'
+  autoload :Version,            'rubygems/version'
+
+  require "rubygems/specification"
+end
+
+require 'rubygems/exceptions'
+
+# REFACTOR: This should be pulled out into some kind of hacks file.
+gem_preluded = Gem::GEM_PRELUDE_SUCKAGE and defined? Gem
+unless gem_preluded then # TODO: remove guard after 1.9.2 dropped
+  begin
+    ##
+    # Defaults the operating system (or packager) wants to provide for RubyGems.
+
+    require 'rubygems/defaults/operating_system'
+  rescue LoadError
+  end
+
+  if defined?(RUBY_ENGINE) then
+    begin
+      ##
+      # Defaults the Ruby implementation wants to provide for RubyGems
+
+      require "rubygems/defaults/#{RUBY_ENGINE}"
+    rescue LoadError
+    end
+  end
+end
+
+##
+# Loads the default specs.
+Gem::Specification.load_defaults
+
+require 'rubygems/core_ext/kernel_gem'
+require 'rubygems/core_ext/kernel_require'
+
+Gem.use_gemdeps
+