Gem::CommandManager#process_args

# File tmp/rubies/ruby-3.3.0/lib/rubygems/command_manager.rb, line 167
def process_args(args, build_args=nil)
  if args.empty?
    say Gem::Command::HELP
    terminate_interaction 1
  end

  case args.first
  when "-h", "--help" then
    say Gem::Command::HELP
    terminate_interaction 0
  when "-v", "--version" then
    say Gem::VERSION
    terminate_interaction 0
  when "-C" then
    args.shift
    start_point = args.shift
    if Dir.exist?(start_point)
      Dir.chdir(start_point) { invoke_command(args, build_args) }
    else
      alert_error clean_text("#{start_point} isn't a directory.")
      terminate_interaction 1
    end
  when /^-/ then
    alert_error clean_text("Invalid option: #{args.first}. See 'gem --help'.")
    terminate_interaction 1
  else
    invoke_command(args, build_args)
  end
end