class Pry::CLI

def add_option_processor(&block)
  self.option_processors ||= []
  option_processors << block
  self
end

def add_options(&block)
  if options
    old_options = options
    self.options = proc do
      instance_exec(&old_options)
      instance_exec(&block)
    end
  else
    self.options = block
  end
  self
end

def parse_options(args = ARGV)
  unless options
    raise NoOptionsError,
          "No command line options defined! Use Pry::CLI.add_options to " \
          "add command line options."
  end
  @pass_argv = args.index { |cli_arg| %w[- --].include?(cli_arg) }
  if @pass_argv
    slop_args = args[0...@pass_argv]
    self.input_args = args.replace(args[@pass_argv + 1..-1])
  else
    self.input_args = slop_args = args
  end
  begin
    opts = Pry::Slop.parse!(
      slop_args,
      help: true,
      multiple_switches: false,
      strict: true,
      &options
    )
  rescue Pry::Slop::InvalidOptionError
    # Display help message on unknown switches and exit.
    puts Pry::Slop.new(&options)
    Kernel.exit
  end
  Pry.initial_session_setup
  Pry.final_session_setup
  # Option processors are optional.
  option_processors.each { |processor| processor.call(opts) } if option_processors
  opts
end

def reset
  self.options           = nil
  self.option_processors = nil
end

def start(opts)
  Kernel.exit if opts.help?
  # invoked via cli
  Pry.cli = true
  # create the actual context
  if opts[:context]
    Pry.initial_session_setup
    context = Pry.binding_for(eval(opts[:context])) # rubocop:disable Security/Eval
    Pry.final_session_setup
  else
    context = Pry.toplevel_binding
  end
  if !@pass_argv && Pry::CLI.input_args.any? && Pry::CLI.input_args != ["pry"]
    full_name = File.expand_path(Pry::CLI.input_args.first)
    Pry.load_file_through_repl(full_name)
    Kernel.exit
  end
  # Start the session (running any code passed with -e, if there is any)
  Pry.start(context, input: StringIO.new(Pry.config.exec_string))
end