Berger, Daniel
8/25/2006 9:49:00 PM
> -----Original Message-----
> From: Stephen Veit [mailto:srveit@gmail.com]
> Sent: Friday, August 25, 2006 3:32 PM
> To: ruby-talk ML
> Subject: Re: Can you temporarily turn off STDERR ??
>
>
> On 8/25/06, Berger, Daniel <Daniel.Berger@qwest.com> wrote:
> >
> > This comes up often enough that I wonder if allowing
> IO#reopen to take
> > a block would be a good idea:
> >
> > $stderr.reopen('/dev/null') do
> > # Code here redirects to /dev/null
> > end
> >
> > # Code outside the block behaves normally
> >
> > I thought this idea had been brought up before, and that there was
> > some downside to this, but I can't find any references to it now.
> >
> > Thoughts?
> >
> > - Dan
>
> How about this?
>
> #!/usr/bin/env ruby
>
> # reopen_with_block.rb
>
> class IO
>
> alias_method :_orig_reopen, :reopen
>
> def reopen(*args)
> if block_given?
> is_path = args.length == 2
> path_or_io, mode_str = args
> old_io = clone
> path_or_io = File.open(path_or_io, mode_str || "w") if is_path
> _orig_reopen(path_or_io)
> begin
> yield
> ensure
> _orig_reopen(old_io)
> path_or_io.close if is_path
> end
> else
> _orig_reopen(*args)
> end
> end
>
> end
>
> if $0 == __FILE__
> $stderr.reopen('error_log', 'w') do
> $stderr.puts "Stuff on error"
> puts "normal stuff"
> end
>
> File.open('error_log_2', "w") do |file|
> $stderr.reopen(file) do
> $stderr.puts "Stuff on error 2"
> puts "normal stuff 2"
> end
> end
>
> $stderr.reopen('/dev/null') do
> $stderr.puts "Stuff on error 3"
> puts "normal stuff 3"
> end
>
> # Make sure old way works
> old_stderr = $stderr.clone
> File.open('error_log_4', 'w') do |log_file|
> $stderr.reopen(log_file)
> begin
> $stderr.puts "Stuff on error 4"
> puts "normal stuff 4"
> ensure
> $stderr.reopen(old_stderr)
> end
> end
>
> begin
> $stderr.reopen('error_log_5', 'w') do
> $stderr.puts "Stuff on error 5"
> puts "normal stuff 5"
> raise "This message courtesy of raise"
> end
> rescue => e
> puts e
> end
>
> end
Awesome. Now, can we break this with threads? Aredridel?
Of course, I wonder if IO#reopen is thread safe anyway, regardless of
the block. I've never seriously tested it.
Regards,
Dan
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