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rubygems.rb
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# frozen_string_literal: true
# -*- ruby -*-
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
require 'rbconfig'
module Gem
VERSION = "3.1.0.pre1".freeze
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'
require 'rubygems/path_support'
##
# 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://guides.rubygems.org/]
# * {Frequently Asked Questions}[http://guides.rubygems.org/faqs]
#
# For gem developer documentation see:
#
# * {Creating Gems}[http://guides.rubygems.org/make-your-own-gem]
# * Gem::Specification
# * Gem::Version for version dependency notes
#
# Further RubyGems documentation can be found at:
#
# * {RubyGems Guides}[http://guides.rubygems.org]
# * {RubyGems API}[http://www.rubydoc.info/github/rubygems/rubygems] (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 and then loaded.
#
# For an example plugin, see the {Graph gem}[https://github.com/seattlerb/graph]
# which adds a `gem graph` command.
#
# == RubyGems Defaults, Packaging
#
# RubyGems defaults are stored in lib/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/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!)
#
# == License
#
# 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,
].freeze
GEM_DEP_FILES = %w[
gem.deps.rb
gems.rb
Gemfile
Isolate
].freeze
##
# Subdirectories in a gem repository
REPOSITORY_SUBDIRECTORIES = %w[
build_info
cache
doc
extensions
gems
specifications
].freeze
##
# Subdirectories in a gem repository for default gems
REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES = %w[
gems
specifications/default
].freeze
##
# Exception classes used in a Gem.read_binary +rescue+ statement. Not all of
# these are defined in Ruby 1.8.7, hence the need for this convoluted setup.
READ_BINARY_ERRORS = begin
read_binary_errors = [Errno::EACCES, Errno::EROFS, Errno::ENOSYS]
read_binary_errors << Errno::ENOTSUP if Errno.const_defined?(:ENOTSUP)
read_binary_errors
end.freeze
##
# Exception classes used in Gem.write_binary +rescue+ statement. Not all of
# these are defined in Ruby 1.8.7.
WRITE_BINARY_ERRORS = begin
write_binary_errors = [Errno::ENOSYS]
write_binary_errors << Errno::ENOTSUP if Errno.const_defined?(:ENOTSUP)
write_binary_errors
end.freeze
@@win_platform = nil
@configuration = nil
@gemdeps = 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_by_path path
return false unless spec
return true if spec.activated?
begin
spec.activate
rescue Gem::LoadError => e # this could fail due to gem dep collisions, go lax
spec_by_name = Gem::Specification.find_by_name(spec.name)
if spec_by_name.nil?
raise e
else
spec_by_name.activate
end
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.import Gem.loaded_specs.values.map {|s| Gem::Dependency.new(s.name, s.version) }
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, an exception will be raised, 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
requirements = Gem::Requirement.default if
requirements.empty?
find_spec_for_exe(name, exec_name, requirements).bin_file exec_name
end
def self.find_spec_for_exe(name, exec_name, requirements)
raise ArgumentError, "you must supply exec_name" unless exec_name
dep = Gem::Dependency.new name, requirements
loaded = Gem.loaded_specs[name]
return loaded if loaded && dep.matches_spec?(loaded)
specs = dep.matching_specs(true)
specs = specs.find_all do |spec|
spec.executables.include? exec_name
end if exec_name
unless spec = specs.first
msg = "can't find gem #{dep} with executable #{exec_name}"
if name == "bundler" && bundler_message = Gem::BundlerVersionFinder.missing_version_message
msg = bundler_message
end
raise Gem::GemNotFoundException, msg
end
spec
end
private_class_method :find_spec_for_exe
##
# Find the full path to the executable for gem +name+. If the +exec_name+
# is not given, an exception will be raised, otherwise the
# specified executable's path is returned. +requirements+ allows
# you to specify specific gem versions.
#
# A side effect of this method is that it will activate the gem that
# contains the executable.
#
# This method should *only* be used in bin stub files.
def self.activate_bin_path(name, exec_name = nil, *requirements) # :nodoc:
spec = find_spec_for_exe name, exec_name, requirements
Gem::LOADED_SPECS_MUTEX.synchronize do
spec.activate
finish_resolve
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)
spec = @loaded_specs[gem_name]
return nil if spec.nil?
spec.datadir
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(ENV)
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'
# Keys for the +env+ hash should be Strings, and values of the hash should
# be Strings or +nil+.
def self.paths=(env)
clear_paths
target = {}
env.each_pair do |k,v|
case k
when 'GEM_HOME', 'GEM_PATH', 'GEM_SPEC_CACHE'
case v
when nil, String
target[k] = v
when Array
unless Gem::Deprecate.skip
warn <<-eowarn
Array values in the parameter to `Gem.paths=` are deprecated.
Please use a String or nil.
An Array (#{env.inspect}) was passed in from #{caller[3]}
eowarn
end
target[k] = v.join File::PATH_SEPARATOR
end
else
target[k] = v
end
end
@paths = Gem::PathSupport.new ENV.to_hash.merge(target)
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']
"#{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
gem_specifications = @gemdeps ? Gem.loaded_specs.values : Gem::Specification.stubs
files.concat gem_specifications.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:
glob_with_suffixes = "#{glob}#{Gem.suffix_pattern}"
$LOAD_PATH.map do |load_path|
Gem::Util.glob_files_in_dir(glob_with_suffixes, load_path)
end.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
Dir.home.dup
rescue
if Gem.win_platform?
File.expand_path File.join(ENV['HOMEDRIVE'] || ENV['SystemDrive'], '/')
else
File.expand_path "/"
end
end
private_class_method :find_home
# TODO: remove in RubyGems 4.0
##
# Zlib::GzipReader wrapper that unzips +data+.
def self.gunzip(data)
Gem::Util.gunzip data
end
class << self
extend Gem::Deprecate
deprecate :gunzip, "Gem::Util.gunzip", 2018, 12
end
##
# Zlib::GzipWriter wrapper that zips +data+.
def self.gzip(data)
Gem::Util.gzip data
end
class << self
extend Gem::Deprecate
deprecate :gzip, "Gem::Util.gzip", 2018, 12
end
##
# A Zlib::Inflate#inflate wrapper
def self.inflate(data)
Gem::Util.inflate data
end
class << self
extend Gem::Deprecate
deprecate :inflate, "Gem::Util.inflate", 2018, 12
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
$LOAD_PATH.each_with_index do |path, i|
return i if path.instance_variable_defined?(:@gem_prelude_index)
end
index = $LOAD_PATH.index RbConfig::CONFIG['sitelibdir']
index
end
##
# Add a list of paths to the $LOAD_PATH at the proper place.
def self.add_to_load_path(*paths)
insert_index = load_path_insert_index
if insert_index
# gem directories must come after -I and ENV['RUBYLIB']
$LOAD_PATH.insert(insert_index, *paths)
else
# we are probably testing in core, -I and RUBYLIB don't apply
$LOAD_PATH.unshift(*paths)
end
end
@yaml_loaded = false
##
# Loads YAML, preferring Psych
def self.load_yaml
return if @yaml_loaded
return unless defined?(gem)
begin
gem 'psych', '>= 2.0.0'
rescue Gem::LoadError
# It's OK if the user does not have the psych gem installed. We will
# attempt to require the stdlib version
end
begin
# Try requiring the gem version *or* stdlib version of psych.
require 'psych'
rescue ::LoadError
# If we can't load psych, thats fine, go on.
else
# If 'yaml' has already been required, then we have to
# be sure to switch it over to the newly loaded psych.
if defined?(YAML::ENGINE) && YAML::ENGINE.yamler != "psych"
YAML::ENGINE.yamler = "psych"
end
require 'rubygems/psych_additions'
require 'rubygems/psych_tree'
end
require 'yaml'
require 'rubygems/safe_yaml'
# Now that we're sure some kind of yaml library is loaded, pull
# in our hack to deal with Syck's DefaultKey ugliness.
require 'rubygems/syck_hack'
@yaml_loaded = true
end
##
# The file name and line number of the caller of the caller of this method.
#
# +depth+ is how many layers up the call stack it should go.
#
# e.g.,
#
# def a; Gem.location_of_caller; end
# a #=> ["x.rb", 2] # (it'll vary depending on file name and line number)
#
# def b; c; end
# def c; Gem.location_of_caller(2); end
# b #=> ["x.rb", 6] # (it'll vary depending on file name and line number)
def self.location_of_caller(depth = 1)
caller[depth] =~ /(.*?):(\d+).*?$/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)
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)
File.open path, 'rb+' do |f|
f.flock(File::LOCK_EX)
f.read
end
rescue *READ_BINARY_ERRORS
File.open path, 'rb' do |f|
f.read
end
rescue Errno::ENOLCK # NFS
if Thread.main != Thread.current
raise
else
File.open path, 'rb' do |f|
f.read
end
end
end
##
# Safely write a file in binary mode on all platforms.
def self.write_binary(path, data)
open(path, 'wb') do |io|
begin
io.flock(File::LOCK_EX)
rescue *WRITE_BINARY_ERRORS
end
io.write data
end
rescue Errno::ENOLCK # NFS
if Thread.main != Thread.current
raise
else
open(path, 'wb') do |io|
io.write data
end
end
end
##
# The path to the running Ruby interpreter.
def self.ruby
if @ruby.nil?
@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
def self.env_requirement(gem_name)
@env_requirements_by_name ||= {}
@env_requirements_by_name[gem_name] ||= begin
req = ENV["GEM_REQUIREMENT_#{gem_name.upcase}"] || '>= 0'.freeze
Gem::Requirement.create(req)
end
end
post_reset { @env_requirements_by_name = {} }
##
# 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
version << ".#{RUBY_PATCHLEVEL}"
elsif defined?(RUBY_DESCRIPTION)
if RUBY_ENGINE == "ruby"
desc = RUBY_DESCRIPTION[/\Aruby #{Regexp.quote(RUBY_VERSION)}([^ ]+) /, 1]
else
desc = RUBY_DESCRIPTION[/\A#{RUBY_ENGINE} #{Regexp.quote(RUBY_ENGINE_VERSION)} \(#{RUBY_VERSION}([^ ]+)\) /, 1]
end
version << ".#{desc}" if desc
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
##