From: Sam Roberts <sroberts@...>
Date: 2006-05-18T03:32:36+09:00
Subject: Re: Capturing stdout

Quoting damphyr@freemail.gr, on Wed, May 17, 2006 at 07:49:34PM +0900:
> I have code that prints to stdout (using puts and/or print).
> I'm loading the code from a file (pretty much the way rake handles 
> rakefiles) and would like to capture the output from the loaded code.
> I don't want to redirect stdout into a file or anywhere else, I need the 
> output in a string.
> 
> ---file1.rb
> puts "Output of meaningful code omitted"
> ---loader.rb
> 
> begin
> ###do some magic to get the stdout from this point on into a string
> load file1.rb
> ###do some more magic to put stdout back where it was.
> end
> 
> Has anyone a solution for this?
> (Now that I think of it would StringIO do for stdout redirection?)

Yes,

% ruby -rstringio -e'$stdout = StringIO.new; puts "hello"; $stderr.puts $stdout.string'
hello