From: ptkwt@...1.aracnet.com (Phil Tomson)
Date: 2002-11-15T17:02:50+09:00
Subject: Re: Howot redirect STDOUT to a string within a script?

In article <41-Fri15Nov2002124848+0900-eban@os.rim.or.jp>,
WATANABE Hirofumi  <eban@os.rim.or.jp> wrote:
>Phil Tomson <ptkwt@shell1.aracnet.com> writes:
>
>> Let's say I've got some strings with Ruby code to be eval'ed, like:
>> 
>> evalstr = 'puts "this is the string"'
>> 
>> and let's say I want to get the part that's sent to STDOUT (by puts) and 
>> capture it in a string, like so:
>> 
>> outputStr = eval evalstr #=> outputStr = "this is the string"
>> 
>> I suspect I could do this by redefining 'puts', but is there a way of 
>> doing it so that puts is only redefined within the context of the eval?
>
>Ruby 1.7 has StringIO.
>
>require 'stringio'
>
>def redirect
>  orig_defout = $defout
>  $defout = StringIO.new
>  yield
>  $defout.string
>ensure
>  $defout = orig_defout
>end
>
>evalstr = 'puts "this is the string"'
>outputStr = redirect { eval evalstr }
>p outputStr

I have ruby 1.7 from CVS but the require 'stringio' failed.
Where is 1.7's stringio?

Phil