module Gem

# File rubygems.rb, line 600
def self.activated_gem_paths
  @activated_gem_paths ||= 0
end

# File rubygems.rb, line 607
def self.add_to_load_path(*paths)
  @activated_gem_paths = activated_gem_paths + paths.size

  # gem directories must come after -I and ENV['RUBYLIB']
  $LOAD_PATH.insert(Gem.load_path_insert_index, *paths)
end

# File rubygems.rb, line 251
def self.bin_path(name, exec_name = nil, *requirements)
  requirements = Gem::Requirement.default if
    requirements.empty?

  find_spec_for_exe(name, exec_name, requirements).bin_file exec_name
end

# File rubygems.rb, line 308
def self.binary_mode
  'rb'
end

# File rubygems.rb, line 315
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

# File rubygems/defaults.rb, line 153
def self.cache_home
  @cache_home ||= (ENV["XDG_CACHE_HOME"] || File.join(Gem.user_home, '.cache'))
end

# File rubygems.rb, line 1238
def clear_default_specs
  @path_to_default_spec_map.clear
end

# File rubygems.rb, line 333
def self.clear_paths
  @paths         = nil
  @user_home     = nil
  Gem::Specification.reset
  Gem::Security.reset if defined?(Gem::Security)
end

# File rubygems/defaults.rb, line 146
def self.config_file
  @config_file ||= find_config_file.tap(&Gem::UNTAINT)
end

# File rubygems/defaults.rb, line 127
def self.config_home
  @config_home ||= (ENV["XDG_CONFIG_HOME"] || File.join(Gem.user_home, '.config'))
end

# File rubygems.rb, line 343
def self.configuration
  @configuration ||= Gem::ConfigFile.new []
end

# File rubygems.rb, line 351
def self.configuration=(config)
  @configuration = config
end

# File rubygems/defaults.rb, line 160
def self.data_home
  @data_home ||= (ENV["XDG_DATA_HOME"] || File.join(Gem.user_home, '.local', 'share'))
end

# File rubygems.rb, line 359
def self.datadir(gem_name)
  spec = @loaded_specs[gem_name]
  return nil if spec.nil?
  spec.datadir
end

# File rubygems/defaults.rb, line 199
def self.default_bindir
  if defined? RUBY_FRAMEWORK_VERSION # mac framework support
    '/usr/local/bin'
  else # generic install
    RbConfig::CONFIG['bindir']
  end
end

# File rubygems/defaults.rb, line 227
def self.default_cert_path
  default_cert_path = File.join Gem.user_home, ".gem", "gem-public_cert.pem"

  unless File.exist?(default_cert_path)
    default_cert_path = File.join Gem.data_home, "gem", "gem-public_cert.pem"
  end

  default_cert_path
end

# File rubygems/defaults.rb, line 36
def self.default_dir
  path = if defined? RUBY_FRAMEWORK_VERSION
           [
             File.dirname(RbConfig::CONFIG['sitedir']),
             'Gems',
             RbConfig::CONFIG['ruby_version'],
           ]
         else
           [
             RbConfig::CONFIG['rubylibprefix'],
             'gems',
             RbConfig::CONFIG['ruby_version'],
           ]
         end

  @default_dir ||= File.join(*path)
end

# File rubygems/defaults.rb, line 185
def self.default_exec_format
  exec_format = RbConfig::CONFIG['ruby_install_name'].sub('ruby', '%s') rescue '%s'

  unless exec_format =~ /%s/
    raise Gem::Exception,
      "[BUG] invalid exec_format #{exec_format.inspect}, no %s"
  end

  exec_format
end

# File rubygems/defaults.rb, line 61
def self.default_ext_dir_for(base_dir)
  nil
end

# File rubygems/defaults.rb, line 214
def self.default_key_path
  default_key_path = File.join Gem.user_home, ".gem", "gem-private_key.pem"

  unless File.exist?(default_key_path)
    default_key_path = File.join Gem.data_home, "gem", "gem-private_key.pem"
  end

  default_key_path
end

# File rubygems/defaults.rb, line 174
def self.default_path
  path = []
  path << user_dir if user_home && File.exist?(user_home)
  path << default_dir
  path << vendor_dir if vendor_dir and File.directory? vendor_dir
  path
end

# File rubygems/defaults.rb, line 68
def self.default_rubygems_dirs
  nil # default to standard layout
end

# File rubygems/defaults.rb, line 14
def self.default_sources
  %w[https://rubygems.org/]
end

# File rubygems/defaults.rb, line 22
def self.default_spec_cache_dir
  default_spec_cache_dir = File.join Gem.user_home, '.gem', 'specs'

  unless File.exist?(default_spec_cache_dir)
    default_spec_cache_dir = File.join Gem.data_home, 'gem', 'specs'
  end

  default_spec_cache_dir
end

# File rubygems/defaults.rb, line 75
def self.default_specifications_dir
  @default_specifications_dir ||= File.join(Gem.default_dir, "specifications", "default")
end

# File rubygems.rb, line 368
def self.deflate(data)
  require 'zlib'
  Zlib::Deflate.deflate data
end

# File rubygems.rb, line 416
def self.dir
  paths.home
end

# File rubygems.rb, line 709
def self.done_installing(&hook)
  @done_installing_hooks << hook
end

# File rubygems.rb, line 450
def self.ensure_default_gem_subdirectories(dir = Gem.dir, mode = nil)
  ensure_subdirectories(dir, mode, REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES)
end

# File rubygems.rb, line 437
def self.ensure_gem_subdirectories(dir = Gem.dir, mode = nil)
  ensure_subdirectories(dir, mode, REPOSITORY_SUBDIRECTORIES)
end

# File rubygems.rb, line 840
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

# File rubygems/defaults.rb, line 134
def self.find_config_file
  gemrc = File.join Gem.user_home, '.gemrc'
  if File.exist? gemrc
    gemrc
  else
    File.join Gem.config_home, "gem", "gemrc"
  end
end

# File rubygems.rb, line 500
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

# File rubygems.rb, line 537
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

# File rubygems.rb, line 1230
def find_unresolved_default_spec(path)
  default_spec = @path_to_default_spec_map[path]
  return default_spec if default_spec && loaded_specs[default_spec.name] != default_spec
end

# File rubygems.rb, line 236
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

# File rubygems.rb, line 572
def self.host
  @host ||= Gem::DEFAULT_HOST
end

# File rubygems.rb, line 578
def self.host=(host)
  @host = host
end

# File rubygems.rb, line 561
def self.install(name, version = Gem::Requirement.default, *options)
  require_relative "rubygems/dependency_installer"
  inst = Gem::DependencyInstaller.new(*options)
  inst.install name, version
  inst.installed_gems
end

# File rubygems.rb, line 1025
def self.java_platform?
  RUBY_PLATFORM == "java"
end

# File rubygems.rb, line 865
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

# File rubygems.rb, line 852
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

# File rubygems.rb, line 873
def self.latest_version_for(name)
  spec = latest_spec_for name
  spec and spec.version
end

# File rubygems.rb, line 1061
def self.load_env_plugins
  load_plugin_files find_files_from_load_path("rubygems_plugin")
end

# File rubygems.rb, line 586
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 || 0
end

# File rubygems.rb, line 1052
def self.load_plugins
  Gem.path.each do |gem_path|
    load_plugin_files Gem::Util.glob_files_in_dir("*#{Gem.plugin_suffix_pattern}", plugindir(gem_path))
  end
end

# File rubygems.rb, line 619
def self.load_yaml
  return if @yaml_loaded

  begin
    # Try requiring the gem version *or* stdlib version of psych.
    require 'psych'
  rescue ::LoadError
    # If we can't load psych, that's fine, go on.
  else
    require_relative 'rubygems/psych_additions'
    require_relative 'rubygems/psych_tree'
  end

  require 'yaml'
  require_relative 'rubygems/safe_yaml'

  @yaml_loaded = true
end

# File rubygems.rb, line 652
def self.location_of_caller(depth = 1)
  caller[depth] =~ /(.*?):(\d+).*?$/i
  file = $1
  lineno = $2.to_i

  [file, lineno]
end

# File rubygems.rb, line 663
def self.marshal_version
  "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
end

# File rubygems.rb, line 228
def self.needs
  rs = Gem::RequestSet.new

  yield rs

  finish_resolve rs
end

# File rubygems/defaults.rb, line 273
def self.operating_system_defaults
  {}
end

# File rubygems.rb, line 420
def self.path
  paths.path
end

# File rubygems/defaults.rb, line 167
def self.path_separator
  File::PATH_SEPARATOR
end

# File rubygems.rb, line 376
def self.paths
  @paths ||= Gem::PathSupport.new(ENV)
end

# File rubygems.rb, line 386
  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

# File rubygems/defaults.rb, line 292
def self.platform_defaults
  {}
end

# File rubygems.rb, line 677
def self.platforms
  @platforms ||= []
  if @platforms.empty?
    @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
  end
  @platforms
end

# File rubygems.rb, line 670
def self.platforms=(platforms)
  @platforms = platforms
end

# File rubygems.rb, line 948
def self.plugin_suffix_pattern
  @plugin_suffix_pattern ||= "_plugin#{suffix_pattern}"
end

# File rubygems.rb, line 955
def self.plugin_suffix_regexp
  @plugin_suffix_regexp ||= /_plugin#{suffix_regexp}\z/
end

# File rubygems.rb, line 324
def self.plugindir(install_dir=Gem.dir)
  File.join install_dir, 'plugins'
end

# File rubygems.rb, line 692
def self.post_build(&hook)
  @post_build_hooks << hook
end

# File rubygems.rb, line 700
def self.post_install(&hook)
  @post_install_hooks << hook
end

# File rubygems.rb, line 717
def self.post_reset(&hook)
  @post_reset_hooks << hook
end

# File rubygems.rb, line 726
def self.post_uninstall(&hook)
  @post_uninstall_hooks << hook
end

# File rubygems.rb, line 735
def self.pre_install(&hook)
  @pre_install_hooks << hook
end

# File rubygems.rb, line 743
def self.pre_reset(&hook)
  @pre_reset_hooks << hook
end

# File rubygems.rb, line 752
def self.pre_uninstall(&hook)
  @pre_uninstall_hooks << hook
end

# File rubygems.rb, line 761
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

# File rubygems.rb, line 781
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

# File rubygems.rb, line 774
def self.refresh
  Gem::Specification.reset
end

# File rubygems.rb, line 1205
def register_default_spec(spec)
  extended_require_paths = spec.require_paths.map {|f| f + "/" }
  new_format = extended_require_paths.any? {|path| spec.files.any? {|f| f.start_with? path } }

  if new_format
    prefix_group = extended_require_paths.join("|")
    prefix_pattern = /^(#{prefix_group})/
  end

  spec.files.each do |file|
    if new_format
      file = file.sub(prefix_pattern, "")
      next unless $~
    end

    spec.activate if already_loaded?(file)

    @path_to_default_spec_map[file] = spec
    @path_to_default_spec_map[file.sub(suffix_regexp, "")] = spec
  end
end

# File rubygems.rb, line 823
def self.ruby
  if @ruby.nil?
    @ruby = RbConfig.ruby

    @ruby = "\"#{@ruby}\"" if @ruby =~ /\s/
  end

  @ruby
end

# File rubygems.rb, line 836
def self.ruby_api_version
  @ruby_api_version ||= RbConfig::CONFIG['ruby_version'].dup
end

# File rubygems/defaults.rb, line 207
def self.ruby_engine
  RUBY_ENGINE
end

# File rubygems.rb, line 881
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

# File rubygems.rb, line 902
def self.rubygems_version
  return @rubygems_version if defined? @rubygems_version
  @rubygems_version = Gem::Version.new Gem::VERSION
end

# File rubygems.rb, line 1168
def self.source_date_epoch
  Time.at(self.source_date_epoch_string.to_i).utc.freeze
end

# File rubygems.rb, line 1149
def self.source_date_epoch_string
  # The value used if $SOURCE_DATE_EPOCH is not set.
  @default_source_date_epoch ||= Time.now.to_i.to_s

  specified_epoch = ENV["SOURCE_DATE_EPOCH"]

  # If it's empty or just whitespace, treat it like it wasn't set at all.
  specified_epoch = nil if !specified_epoch.nil? && specified_epoch.strip.empty?

  epoch = specified_epoch || @default_source_date_epoch

  epoch.strip
end

# File rubygems.rb, line 911
def self.sources
  source_list = configuration.sources || default_sources
  @sources ||= Gem::SourceList.from(source_list)
end

# File rubygems.rb, line 923
def self.sources=(new_sources)
  if !new_sources
    @sources = nil
  else
    @sources = Gem::SourceList.from(new_sources)
  end
end

# File rubygems.rb, line 424
def self.spec_cache_dir
  paths.spec_cache_dir
end

# File rubygems.rb, line 934
def self.suffix_pattern
  @suffix_pattern ||= "{#{suffixes.join(',')}}"
end

# File rubygems.rb, line 941
def self.suffix_regexp
  @suffix_regexp ||= /#{Regexp.union(suffixes)}\z/
end

# File rubygems.rb, line 962
def self.suffixes
  @suffixes ||= ['',
                 '.rb',
                 *%w[DLEXT DLEXT2].map do |key|
                   val = RbConfig::CONFIG[key]
                   next unless val and not val.empty?
                   ".#{val}"
                 end,
                ].compact.uniq
end

# File rubygems.rb, line 977
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

# File rubygems.rb, line 203
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

# File rubygems.rb, line 992
def self.ui
  require_relative 'rubygems/user_interaction'

  Gem::DefaultUserInteraction.ui
end

# File rubygems.rb, line 1085
def self.use_gemdeps(path = nil)
  raise_exception = path

  path ||= ENV['RUBYGEMS_GEMDEPS']
  return unless path

  path = path.dup

  if path == "-"
    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.tap(&Gem::UNTAINT)

  unless File.file? path
    return unless raise_exception

    raise ArgumentError, "Unable to find gem dependencies file at #{path}"
  end

  ENV["BUNDLE_GEMFILE"] ||= File.expand_path(path)
  require_relative 'rubygems/user_interaction'
  require "bundler"
  begin
    Gem::DefaultUserInteraction.use_ui(ui) do
      begin
        Bundler.ui.silence do
          @gemdeps = Bundler.setup
        end
      ensure
        Gem::DefaultUserInteraction.ui.close
      end
    end
  rescue Bundler::BundlerError => e
    warn e.message
    warn "You may need to `bundle install` to install missing gems"
    warn ""
  end
end

# File rubygems.rb, line 1002
def self.use_paths(home, *paths)
  paths.flatten!
  paths.compact!
  hash = { "GEM_HOME" => home, "GEM_PATH" => paths.empty? ? home : paths.join(File::PATH_SEPARATOR) }
  hash.delete_if {|_, v| v.nil? }
  self.paths = hash
end

# File rubygems/defaults.rb, line 116
def self.user_dir
  gem_dir = File.join(Gem.user_home, ".gem")
  gem_dir = File.join(Gem.data_home, "gem") unless File.exist?(gem_dir)
  parts = [gem_dir, ruby_engine]
  parts << RbConfig::CONFIG['ruby_version'] unless RbConfig::CONFIG['ruby_version'].empty?
  File.join parts
end

# File rubygems/defaults.rb, line 109
def self.user_home
  @user_home ||= find_home.tap(&Gem::UNTAINT)
end

# File rubygems.rb, line 1013
def self.win_platform?
  if @@win_platform.nil?
    ruby_platform = RbConfig::CONFIG['host_os']
    @@win_platform = !!WIN_PATTERNS.find {|r| ruby_platform =~ r }
  end

  @@win_platform
end

# File rubygems.rb, line 802
def self.write_binary(path, data)
  File.open(path, File::RDWR | File::CREAT | File::BINARY | File::LOCK_EX) do |io|
    io.write data
  end
rescue *WRITE_BINARY_ERRORS
  File.open(path, 'wb') do |io|
    io.write data
  end
rescue Errno::ENOLCK # NFS
  if Thread.main != Thread.current
    raise
  else
    File.open(path, 'wb') do |io|
      io.write data
    end
  end
end

# File rubygems.rb, line 1289
def already_loaded?(file)
  $LOADED_FEATURES.any? do |feature_path|
    feature_path.end_with?(file) && default_gem_load_paths.any? {|load_path_entry| feature_path == "#{load_path_entry}/#{file}" }
  end
end

# File rubygems.rb, line 1295
def default_gem_load_paths
  @default_gem_load_paths ||= $LOAD_PATH[load_path_insert_index..-1]
end

# File rubygems/defaults.rb, line 94
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

# File rubygems.rb, line 258
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 dep.filters_bundler? && bundler_message = Gem::BundlerVersionFinder.missing_version_message
      msg = bundler_message
    end
    raise Gem::GemNotFoundException, msg
  end

  spec
end