go_interactive lets you interactively write specs

go_interactive.rb

class GoInteractive
  def self.start(*args, **kwargs)
    @init ||= begin
      Pry.hooks.add_hook(:before_eval, "go_interactive") do |code, pry|
        current.before_eval(code, pry)
      end

      Pry.hooks.add_hook(:after_eval, "go_interactive") do |result, pry|
        current.after_eval(result, pry)
      end

      Pry::Commands.block_command("shipit", "Inserts successful interactive code back into the file") do
        GoInteractive.current.ship_it
      end
      true
    end
    self.current = new
    self.current.start(*args, **kwargs)
  end

  cattr_accessor :current

  def initialize
    @lines ||= []
  end

  def before_eval(code, pry)
    @current_code = code
    @exception = nil
  end

  def after_eval(result, pry)
    if ex = $!
      # Exception, ignore result
    else
      @lines << @current_code.strip unless @current_code.blank?
    end
  end

  def ship_it
    puts @lines.join("\n")
  end

  def start(caller_index: 0)
    binding.of_caller(caller_index + 2).pry
  end
end

# in a helper or whereever
def go_interactive
  GoInteractive.start(caller_index: 1) # change caller_index so the correct binding is 
end