From: Gregory Brown <gregory.t.brown@...>
Date: 2008-10-23T23:00:08+09:00
Subject: Re: Is there a method_eval or similar thing ?

On Thu, Oct 23, 2008 at 8:12 AM, Nit Khair <sentinel.2001@gmx.com> wrote:
> Brian Candler wrote:
>> However you could turn it around and get the caller to pass a
>> pre-prepared hash containing all the bindings to askyn:
>>
>>   askyn("Do you wish to proceed?", "n",
>>     :yes => lambda { puts "user pressed yes" }
>>     :no =>  lambda { puts "user pressed no" }
>>   )
>>
>
> That is something which immediately struck me as a possibility since I
> was considering putting some configurations into a hash anyway.
>
>   askyn("Do you wish to proceed?", config = {}, &block)
>
> I had thought that would be ugly, and I might be missing something
> elegant and simple. However, perhaps that *is* the simple way to go.

How about this? (Someone suggested before using an object to abstract
your needs, I've only implemented it)

class Answer
  def yes(&block)
    @yes = block
  end

  def no(&block)
    @no = block
  end

  def process(string)
    (string =~ /\by(es)?\b/i ? @yes : @no).call
  end
end

def ask_yn(question, &block)
  ans = Answer.new
  ans.instance_eval(&block)
  ans.process(gets.chomp)
end

ask_yn("Are you cool?") do
  yes { puts "Awesome" }
  no  { puts "Lame" }
end



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