Gem::Commands::ContentsCommand#execute

# File tmp/rubies/ruby-3.0.5/lib/rubygems/commands/contents_command.rb, line 65
def execute
  @version   = options[:version] || Gem::Requirement.default
  @spec_dirs = specification_directories
  @path_kind = path_description @spec_dirs

  names = gem_names

  names.each do |name|
    found =
      if options[:show_install_dir]
        gem_install_dir name
      else
        gem_contents name
      end

    terminate_interaction 1 unless found or names.length > 1
  end
end