From: Brian Candler <b.candler@...>
Date: 2009-01-26T17:35:45+09:00
Subject: Re: How can I get the arguments passed to the caller.

James Coglan wrote:
>>  first_arg = ....
>>  $stuff << first_arg
>> end
>>
>> bar(42)
>>
>> # By this point, $stuff would be [42]
> 
> 
> 
> I think the closest you're going to get is for the calling function to 
> pass
> its binding so that foo can read from it:

In which case, it might as well just pass its args instead :-)

There is the Binding.of_caller hack which you can find through a google 
search.

Maybe you could combine this with Kernel#local_variables or 
Binding#local_variables to do what you want? That's what debug.rb does

    when /^\s*l(?:ocal)?\s*$/
      var_list(eval("local_variables", binding), binding)

and just use eval to read them:

  def var_list(ary, binding)
    ary.sort!
    for v in ary
      stdout.printf "  %s => %s\n", v, eval(v, binding).inspect
    end
  end
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