Gem::InstallUpdateOptions#add_install_update_options

# File tmp/rubies/ruby-3.0.5/lib/rubygems/install_update_options.rb, line 20
def add_install_update_options
  add_option(:"Install/Update", '-i', '--install-dir DIR',
             'Gem repository directory to get installed',
             'gems') do |value, options|
    options[:install_dir] = File.expand_path(value)
  end

  add_option(:"Install/Update", '-n', '--bindir DIR',
             'Directory where executables will be',
             'placed when the gem is installed') do |value, options|
    options[:bin_dir] = File.expand_path(value)
  end

  add_option(:"Install/Update", '--document [TYPES]', Array,
             'Generate documentation for installed gems',
             'List the documentation types you wish to',
             'generate.  For example: rdoc,ri') do |value, options|
    options[:document] = case value
                         when nil   then %w[ri]
                         when false then []
                         else            value
                         end
  end

  add_option(:"Install/Update", '--build-root DIR',
             'Temporary installation root. Useful for building',
             'packages. Do not use this when installing remote gems.') do |value, options|
    options[:build_root] = File.expand_path(value)
  end

  add_option(:"Install/Update", '--vendor',
             'Install gem into the vendor directory.',
             'Only for use by gem repackagers.') do |value, options|
    unless Gem.vendor_dir
      raise Gem::OptionParser::InvalidOption.new 'your platform is not supported'
    end

    options[:vendor] = true
    options[:install_dir] = Gem.vendor_dir
  end

  add_option(:"Install/Update", '-N', '--no-document',
             'Disable documentation generation') do |value, options|
    options[:document] = []
  end

  add_option(:"Install/Update", '-E', '--[no-]env-shebang',
             "Rewrite the shebang line on installed",
             "scripts to use /usr/bin/env") do |value, options|
    options[:env_shebang] = value
  end

  add_option(:"Install/Update", '-f', '--[no-]force',
             'Force gem to install, bypassing dependency',
             'checks') do |value, options|
    options[:force] = value
  end

  add_option(:"Install/Update", '-w', '--[no-]wrappers',
             'Use bin wrappers for executables',
             'Not available on dosish platforms') do |value, options|
    options[:wrappers] = value
  end

  add_security_option

  add_option(:"Install/Update", '--ignore-dependencies',
             'Do not install any required dependent gems') do |value, options|
    options[:ignore_dependencies] = value
  end

  add_option(:"Install/Update", '--[no-]format-executable',
             'Make installed executable names match Ruby.',
             'If Ruby is ruby18, foo_exec will be',
             'foo_exec18') do |value, options|
    options[:format_executable] = value
  end

  add_option(:"Install/Update",       '--[no-]user-install',
             'Install in user\'s home directory instead',
             'of GEM_HOME.') do |value, options|
    options[:user_install] = value
  end

  add_option(:"Install/Update", "--development",
              "Install additional development",
              "dependencies") do |value, options|
    options[:development] = true
    options[:dev_shallow] = true
  end

  add_option(:"Install/Update", "--development-all",
              "Install development dependencies for all",
              "gems (including dev deps themselves)") do |value, options|
    options[:development] = true
    options[:dev_shallow] = false
  end

  add_option(:"Install/Update", "--conservative",
              "Don't attempt to upgrade gems already",
              "meeting version requirement") do |value, options|
    options[:conservative] = true
    options[:minimal_deps] = true
  end

  add_option(:"Install/Update", "--[no-]minimal-deps",
              "Don't upgrade any dependencies that already",
              "meet version requirements") do |value, options|
    options[:minimal_deps] = value
  end

  add_option(:"Install/Update", "--[no-]post-install-message",
              "Print post install message") do |value, options|
    options[:post_install_message] = value
  end

  add_option(:"Install/Update", '-g', '--file [FILE]',
             'Read from a gem dependencies API file and',
             'install the listed gems') do |v,o|
    v = Gem::GEM_DEP_FILES.find do |file|
      File.exist? file
    end unless v

    unless v
      message = v ? v : "(tried #{Gem::GEM_DEP_FILES.join ', '})"

      raise Gem::OptionParser::InvalidArgument,
              "cannot find gem dependencies file #{message}"
    end

    options[:gemdeps] = v
  end

  add_option(:"Install/Update", '--without GROUPS', Array,
             'Omit the named groups (comma separated)',
             'when installing from a gem dependencies',
             'file') do |v,o|
    options[:without_groups].concat v.map {|without| without.intern }
  end

  add_option(:"Install/Update", '--default',
             'Add the gem\'s full specification to',
             'specifications/default and extract only its bin') do |v,o|
    options[:install_as_default] = v
  end

  add_option(:"Install/Update", '--explain',
             'Rather than install the gems, indicate which would',
             'be installed') do |v,o|
    options[:explain] = v
  end

  add_option(:"Install/Update", '--[no-]lock',
             'Create a lock file (when used with -g/--file)') do |v,o|
    options[:lock] = v
  end

  add_option(:"Install/Update", '--[no-]suggestions',
             'Suggest alternates when gems are not found') do |v,o|
    options[:suggest_alternate] = v
  end
end