From: Jim Weirich <jweirich@...>
Date: 2003-05-03T08:57:54+09:00
Subject: Re: temporary redirection of stdout

On Fri, 2003-05-02 at 15:07, ahoward wrote:

> anyhow - i can appreciate your opinion but i'm using it in my scripts ;-)  but
> then again i *love* the entire
> 
>   Resource.aquire do |resource|
>     ...
>   end
> 
> paradigm and the way it makes code read - to me it feels somehow more
> ruby-ish.

I've used the following in the past.  Now that 1.8 has StringIO, its
even better ...

  def redirect_output(output)
    old_output = $defout
    $defout = output
    yield
  ensure
    $defout = old_output
  end

And then ...

  require 'stringio'
  sio = StringIO.new
  redirect_output(sio) { puts "HI" }
  p sio.string     # => "HI\n"

By using $defout, I can redirect to string objects (great for
testing!).  If I try to use reopen, then I can't redirect to StringIO
objects :-(

-- 
-- Jim Weirich     jweirich@one.net    http://w3.one.net/~jweirich
---------------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct, 
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)