From: Robert Klemme <shortcutter@...>
Date: 2009-01-20T19:47:20+09:00
Subject: Re: is it possible to override a 'read only' environmental variable like $" ?

2009/1/20 timr <timrandg@gmail.com>:
> Hi guys/gals,
> I am trying to write a method to give the full paths of all files
> loaded into a program when a require statement is executed.
> I would like to be able to get the same result each time a "require
> 'file'" statement is executed. To do so, I need to get the $"
> back to the state it was in prior to the require command being
> executed. But alas it is read only and does not allow me to redefine
> it.
> Anyone know how to override a read only setting or circumvent this
> somehow.

As far as I can see you do not need that.  You can do this:

#!/bin/env ruby

def require_logged file
  old = $".dup
  if require file
    ($" - old).each do |loaded_file|
      full = nil
      $:.each do |path|
        full = File.join(path, loaded_file)
        break nil if test(?r, full)
      end and raise "Could not find file #{loaded_file}"
      puts "loaded #{full}"
    end
  end
end

p require_logged('socket')
p require_logged('socket')

Kind regards

robert

-- 
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