pry--pry/lib/pry/commands/bang.rb

class Pry
  class Command::Bang < Pry::ClassCommand
    match(/^\s*!\s*$/)
    group 'Editing'
    description 'Clear the input buffer.'
    command_options use_prefix: false

    banner <<-'BANNER'
      Clear the input buffer. Useful if the parsing process goes wrong and you get
      stuck in the read loop.
    BANNER

    def process
      output.puts 'Input buffer cleared!'
      eval_string.replace('')
    end
  end

  Pry::Commands.add_command(Pry::Command::Bang)
end