module Gem

# File rubygems.rb, line 577
def self.activated_gem_paths
  @activated_gem_paths ||= 0
end

# File rubygems.rb, line 584
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 240
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 294
def self.binary_mode
  "rb"
end

# File rubygems.rb, line 301
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 147
def self.cache_home
  @cache_home ||= (ENV["XDG_CACHE_HOME"] || File.join(Gem.user_home, ".cache"))
end

# File rubygems.rb, line 1217
def clear_default_specs
  @path_to_default_spec_map.clear
end

# File rubygems.rb, line 319
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 133
def self.config_file
  @config_file ||= find_config_file.tap(&Gem::UNTAINT)
end

# File rubygems/defaults.rb, line 114
def self.config_home
  @config_home ||= (ENV["XDG_CONFIG_HOME"] || File.join(Gem.user_home, ".config"))
end

# File rubygems.rb, line 329
def self.configuration
  @configuration ||= Gem::ConfigFile.new []
end

# File rubygems.rb, line 337
def self.configuration=(config)
  @configuration = config
end

# File rubygems/defaults.rb, line 154
def self.data_home
  @data_home ||= (ENV["XDG_DATA_HOME"] || File.join(Gem.user_home, ".local", "share"))
end

# File rubygems/defaults.rb, line 204
def self.default_bindir
  RbConfig::CONFIG["bindir"]
end

# File rubygems/defaults.rb, line 228
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 37
def self.default_dir
  @default_dir ||= File.join(RbConfig::CONFIG["rubylibprefix"], "gems", RbConfig::CONFIG["ruby_version"])
end

# File rubygems/defaults.rb, line 186
def self.default_exec_format
  exec_format = begin
                  RbConfig::CONFIG["ruby_install_name"].sub("ruby", "%s")
                rescue StandardError
                  "%s"
                end

  unless exec_format.include?("%s")
    raise Gem::Exception,
      "[BUG] invalid exec_format #{exec_format.inspect}, no %s"
  end

  exec_format
end

# File rubygems/defaults.rb, line 48
def self.default_ext_dir_for(base_dir)
  nil
end

# File rubygems/defaults.rb, line 215
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 175
def self.default_path
  path = []
  path << user_dir if user_home && File.exist?(user_home)
  path << default_dir
  path << vendor_dir if vendor_dir && File.directory?(vendor_dir)
  path
end

# File rubygems/defaults.rb, line 55
def self.default_rubygems_dirs
  nil # default to standard layout
end

# File rubygems/defaults.rb, line 15
def self.default_sources
  %w[https://rubygems.org/]
end

# File rubygems/defaults.rb, line 23
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 62
def self.default_specifications_dir
  @default_specifications_dir ||= File.join(Gem.default_dir, "specifications", "default")
end

# File rubygems.rb, line 344
def self.deflate(data)
  require "zlib"
  Zlib::Deflate.deflate data
end

# File rubygems.rb, line 392
def self.dir
  paths.home
end

# File rubygems.rb, line 678
def self.done_installing(&hook)
  @done_installing_hooks << hook
end

# File rubygems.rb, line 426
def self.ensure_default_gem_subdirectories(dir = Gem.dir, mode = nil)
  ensure_subdirectories(dir, mode, REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES)
end

# File rubygems.rb, line 413
def self.ensure_gem_subdirectories(dir = Gem.dir, mode = nil)
  ensure_subdirectories(dir, mode, REPOSITORY_SUBDIRECTORIES)
end

# File rubygems.rb, line 811
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"
    Gem::Requirement.create(req)
  end
end

# File rubygems/defaults.rb, line 121
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 477
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

  files
end

# File rubygems.rb, line 514
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

  files
end

# File rubygems.rb, line 1209
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 225
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 549
def self.host
  @host ||= Gem::DEFAULT_HOST
end

# File rubygems.rb, line 555
def self.host=(host)
  @host = host
end

# File rubygems.rb, line 538
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 992
def self.java_platform?
  RUBY_PLATFORM == "java"
end

# File rubygems.rb, line 836
def self.latest_rubygems_version
  latest_version_for("rubygems-update") ||
    raise("Can't find 'rubygems-update' in any repo. Check `gem source list`.")
end

# File rubygems.rb, line 823
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.last

  spec
end

# File rubygems.rb, line 844
def self.latest_version_for(name)
  latest_spec_for(name)&.version
end

# File rubygems.rb, line 1034
def self.load_env_plugins
  load_plugin_files find_files_from_load_path("rubygems_plugin")
end

# File rubygems.rb, line 563
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 1025
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 596
def self.load_yaml
  return if @yaml_loaded

  require "psych"
  require_relative "rubygems/psych_tree"

  require_relative "rubygems/safe_yaml"

  @yaml_loaded = true
end

# File rubygems.rb, line 621
def self.location_of_caller(depth = 1)
  caller[depth] =~ /(.*?):(\d+).*?$/i
  file = $1
  lineno = $2.to_i

  [file, lineno]
end

# File rubygems.rb, line 632
def self.marshal_version
  "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
end

# File rubygems.rb, line 217
def self.needs
  rs = Gem::RequestSet.new

  yield rs

  finish_resolve rs
end

# File rubygems.rb, line 771
def self.open_file(path, flags, &block)
  File.open(path, flags) do |io|
    if !java_platform? && win_platform?
      begin
        io.flock(File::LOCK_EX)
      rescue Errno::ENOSYS, Errno::ENOTSUP
      end
    end
    yield io
  end
rescue Errno::ENOLCK # NFS
  if Thread.main != Thread.current
    raise
  else
    File.open(path, flags) do |io|
      yield io
    end
  end
end

# File rubygems/defaults.rb, line 274
def self.operating_system_defaults
  {}
end

# File rubygems.rb, line 396
def self.path
  paths.path
end

# File rubygems/defaults.rb, line 168
def self.path_separator
  File::PATH_SEPARATOR
end

# File rubygems.rb, line 352
def self.paths
  @paths ||= Gem::PathSupport.new(ENV)
end

# File rubygems.rb, line 362
  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 293
def self.platform_defaults
  {}
end

# File rubygems.rb, line 646
def self.platforms
  @platforms ||= []
  if @platforms.empty?
    @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
  end
  @platforms
end

# File rubygems.rb, line 639
def self.platforms=(platforms)
  @platforms = platforms
end

# File rubygems.rb, line 916
def self.plugin_suffix_pattern
  @plugin_suffix_pattern ||= "_plugin#{suffix_pattern}"
end

# File rubygems.rb, line 923
def self.plugin_suffix_regexp
  @plugin_suffix_regexp ||= /_plugin#{suffix_regexp}\z/
end

# File rubygems.rb, line 310
def self.plugindir(install_dir=Gem.dir)
  File.join install_dir, "plugins"
end

# File rubygems.rb, line 661
def self.post_build(&hook)
  @post_build_hooks << hook
end

# File rubygems.rb, line 669
def self.post_install(&hook)
  @post_install_hooks << hook
end

# File rubygems.rb, line 686
def self.post_reset(&hook)
  @post_reset_hooks << hook
end

# File rubygems.rb, line 695
def self.post_uninstall(&hook)
  @post_uninstall_hooks << hook
end

# File rubygems.rb, line 704
def self.pre_install(&hook)
  @pre_install_hooks << hook
end

# File rubygems.rb, line 712
def self.pre_reset(&hook)
  @pre_reset_hooks << hook
end

# File rubygems.rb, line 721
def self.pre_uninstall(&hook)
  @pre_uninstall_hooks << hook
end

# File rubygems.rb, line 730
def self.prefix
  prefix = File.dirname RUBYGEMS_DIR

  if prefix != File.expand_path(RbConfig::CONFIG["sitelibdir"]) &&
     prefix != File.expand_path(RbConfig::CONFIG["libdir"]) &&
     File.basename(RUBYGEMS_DIR) == "lib"
    prefix
  end
end

# File rubygems.rb, line 750
def self.read_binary(path)
  open_file(path, "rb+", &:read)
rescue Errno::EACCES, Errno::EROFS
  open_file(path, "rb", &:read)
end

# File rubygems.rb, line 743
def self.refresh
  Gem::Specification.reset
end

# File rubygems.rb, line 1184
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 794
def self.ruby
  if @ruby.nil?
    @ruby = RbConfig.ruby

    @ruby = "\"#{@ruby}\"" if /\s/.match?(@ruby)
  end

  @ruby
end

# File rubygems.rb, line 807
def self.ruby_api_version
  @ruby_api_version ||= RbConfig::CONFIG["ruby_version"].dup
end

# File rubygems/defaults.rb, line 208
def self.ruby_engine
  RUBY_ENGINE
end

# File rubygems.rb, line 851
def self.ruby_version
  return @ruby_version if defined? @ruby_version
  version = RUBY_VERSION.dup

  if RUBY_PATCHLEVEL == -1
    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 870
def self.rubygems_version
  return @rubygems_version if defined? @rubygems_version
  @rubygems_version = Gem::Version.new Gem::VERSION
end

# File rubygems.rb, line 999
def self.solaris_platform?
  RUBY_PLATFORM.include?("solaris")
end

# File rubygems.rb, line 1139
def self.source_date_epoch
  Time.at(source_date_epoch_string.to_i).utc.freeze
end

# File rubygems.rb, line 1120
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 879
def self.sources
  source_list = configuration.sources || default_sources
  @sources ||= Gem::SourceList.from(source_list)
end

# File rubygems.rb, line 891
def self.sources=(new_sources)
  if !new_sources
    @sources = nil
  else
    @sources = Gem::SourceList.from(new_sources)
  end
end

# File rubygems.rb, line 400
def self.spec_cache_dir
  paths.spec_cache_dir
end

# File rubygems/defaults.rb, line 140
def self.state_file
  @state_file ||= File.join(Gem.state_home, "gem", "last_update_check").tap(&Gem::UNTAINT)
end

# File rubygems/defaults.rb, line 161
def self.state_home
  @state_home ||= (ENV["XDG_STATE_HOME"] || File.join(Gem.user_home, ".local", "state"))
end

# File rubygems.rb, line 902
def self.suffix_pattern
  @suffix_pattern ||= "{#{suffixes.join(",")}}"
end

# File rubygems.rb, line 909
def self.suffix_regexp
  @suffix_regexp ||= /#{Regexp.union(suffixes)}\z/
end

# File rubygems.rb, line 930
def self.suffixes
  @suffixes ||= ["",
                 ".rb",
                 *%w[DLEXT DLEXT2].map do |key|
                   val = RbConfig::CONFIG[key]
                   next unless val && !val.empty?
                   ".#{val}"
                 end].compact.uniq
end

# File rubygems.rb, line 944
def self.time(msg, width = 0, display = Gem.configuration.verbose)
  now = Time.now

  value = yield

  elapsed = Time.now - now

  ui.say format("%2$*1$s: %3$3.3fs", -width, msg, elapsed) if display

  value
end

# File rubygems.rb, line 192
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

  true
end

# File rubygems.rb, line 959
def self.ui
  require_relative "rubygems/user_interaction"

  Gem::DefaultUserInteraction.ui
end

# File rubygems.rb, line 1058
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
      Bundler.ui.silence do
        @gemdeps = Bundler.setup
      end
    ensure
      Gem::DefaultUserInteraction.ui.close
    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 969
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 103
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 96
def self.user_home
  @user_home ||= find_home.tap(&Gem::UNTAINT)
end

# File rubygems.rb, line 980
def self.win_platform?
  if @@win_platform.nil?
    ruby_platform = RbConfig::CONFIG["host_os"]
    @@win_platform = !WIN_PATTERNS.find {|r| ruby_platform =~ r }.nil?
  end

  @@win_platform
end

# File rubygems.rb, line 758
def self.write_binary(path, data)
  open_file(path, "wb") do |io|
    io.write data
  end
rescue Errno::ENOSPC
  # If we ran out of space but the file exists, it's *guaranteed* to be corrupted.
  File.delete(path) if File.exist?(path)
  raise
end

# File rubygems.rb, line 1268
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 1274
def default_gem_load_paths
  @default_gem_load_paths ||= $LOAD_PATH[load_path_insert_index..-1].map do |lp|
    expanded = File.expand_path(lp)
    next expanded unless File.exist?(expanded)

    File.realpath(expanded)
  end
end

# File rubygems/defaults.rb, line 81
def self.find_home
  Dir.home.dup
rescue StandardError
  if Gem.win_platform?
    File.expand_path File.join(ENV["HOMEDRIVE"] || ENV["SystemDrive"], "/")
  else
    File.expand_path "/"
  end
end

# File rubygems.rb, line 247
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}"
    raise Gem::GemNotFoundException, msg
  end

  spec
end