晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby27/share/rubygems/rubygems/
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Current File : //opt/alt/ruby27/share/rubygems/rubygems/defaults.rb
# frozen_string_literal: true
module Gem
  DEFAULT_HOST = "https://rubygems.org".freeze

  @post_install_hooks ||= []
  @done_installing_hooks ||= []
  @post_uninstall_hooks ||= []
  @pre_uninstall_hooks  ||= []
  @pre_install_hooks    ||= []

  ##
  # An Array of the default sources that come with RubyGems

  def self.default_sources
    %w[https://rubygems.org/]
  end

  ##
  # Default spec directory path to be used if an alternate value is not
  # specified in the environment

  def self.default_spec_cache_dir
    File.join Gem.user_home, '.gem', 'specs'
  end

  ##
  # Default home directory path to be used if an alternate value is not
  # specified in the environment

  def self.default_dir
    path = if defined? RUBY_FRAMEWORK_VERSION
             [
               File.dirname(RbConfig::CONFIG['sitedir']),
               'Gems',
               RbConfig::CONFIG['ruby_version_dir_name'] || RbConfig::CONFIG['ruby_version']
             ]
           else
             [
               RbConfig::CONFIG['rubylibprefix'],
               'gems',
               RbConfig::CONFIG['ruby_version_dir_name'] || RbConfig::CONFIG['ruby_version']
             ]
           end

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

  ##
  # Returns binary extensions dir for specified RubyGems base dir or nil
  # if such directory cannot be determined.
  #
  # By default, the binary extensions are located side by side with their
  # Ruby counterparts, therefore nil is returned

  def self.default_ext_dir_for(base_dir)
    nil
  end

  ##
  # Paths where RubyGems' .rb files and bin files are installed

  def self.default_rubygems_dirs
    nil # default to standard layout
  end

  ##
  # Path to specification files of default gems.

  def self.default_specifications_dir
    File.join(Gem.default_dir, "specifications", "default")
  end

  ##
  # Path for gems in the user's home directory

  def self.user_dir
    parts = [Gem.user_home, '.gem', ruby_engine]
    ruby_version_dir_name = RbConfig::CONFIG['ruby_version_dir_name'] || RbConfig::CONFIG['ruby_version']
    parts << ruby_version_dir_name unless ruby_version_dir_name.empty?
    File.join parts
  end

  ##
  # How String Gem paths should be split.  Overridable for esoteric platforms.

  def self.path_separator
    File::PATH_SEPARATOR
  end

  ##
  # Default gem load path

  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

  ##
  # Deduce Ruby's --program-prefix and --program-suffix from its install name

  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

  ##
  # The default directory for binaries

  def self.default_bindir
    if defined? RUBY_FRAMEWORK_VERSION  # mac framework support
      '/usr/bin'
    else # generic install
      RbConfig::CONFIG['bindir']
    end
  end

  def self.ruby_engine
    RUBY_ENGINE
  end

  ##
  # The default signing key path

  def self.default_key_path
    File.join Gem.user_home, ".gem", "gem-private_key.pem"
  end

  ##
  # The default signing certificate chain path

  def self.default_cert_path
    File.join Gem.user_home, ".gem", "gem-public_cert.pem"
  end

  ##
  # Install extensions into lib as well as into the extension directory.

  def self.install_extension_in_lib # :nodoc:
    true
  end

  ##
  # Directory where vendor gems are installed.

  def self.vendor_dir # :nodoc:
    if vendor_dir = ENV['GEM_VENDOR']
      return vendor_dir.dup
    end

    return nil unless RbConfig::CONFIG.key? 'vendordir'

    File.join RbConfig::CONFIG['vendordir'], 'gems',
              RbConfig::CONFIG['ruby_version_dir_name'] || RbConfig::CONFIG['ruby_version']
  end

  ##
  # Default options for gem commands for Ruby packagers.
  #
  # The options here should be structured as an array of string "gem"
  # command names as keys and a string of the default options as values.
  #
  # Example:
  #
  # def self.operating_system_defaults
  #   {
  #       'install' => '--no-rdoc --no-ri --env-shebang',
  #       'update' => '--no-rdoc --no-ri --env-shebang'
  #   }
  # end

  def self.operating_system_defaults
    {}
  end

  ##
  # Default options for gem commands for Ruby implementers.
  #
  # The options here should be structured as an array of string "gem"
  # command names as keys and a string of the default options as values.
  #
  # Example:
  #
  # def self.platform_defaults
  #   {
  #       'install' => '--no-rdoc --no-ri --env-shebang',
  #       'update' => '--no-rdoc --no-ri --env-shebang'
  #   }
  # end

  def self.platform_defaults
    {}
  end
end