From: Nit Khair <sentinel.2001@...>
Date: 2008-10-22T18:38:34+09:00
Subject: Is there a method_eval or similar thing ?

I have a method called askyesno which takes a string and returns whether
the user pressed y or n. However, I now want the user to be able to pass
a block in with blocks for what to do for YES and NO.

However, in this block I need to be able to access method level
variables. Here's how i am trying to code a sample of it. btw, askyesno
will actually sit inside a module in my app.

--
# the ch here is only for testing, it contains y or n, so we can test
this out
# easily

def askyn(str, ch, &bl)
  puts str
  h = {}

  def actionbind(key, &block)
    h[key] = block
  end

  if block_given?
    method_eval(&bl)    # or module_eval etc
  end

  case ch
  when 'y'
    h[:yes].call if h.include? :yes
  when 'n'
    h[:no].call if h.include? :no
  end
end

askyn("Do you wish to proceed?", 'n') do
  actionbind(:yes)  { puts "user pressed yes" }
  actionbind(:no)  { puts "user pressed no" }
end


Currently, i have "ask" methods that allow for many options (not just
yes/no), the selection is passed back to the caller and he has a
case-when in which he takes appropriate action.

I was considering trying out something like the above where he could
pass in proc - bindings for each key. Is there any way to access the
hash "h" from the block ?
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