Suppress Output Ruby wrapper

suppress_output.rb

# This wrapper method helps to suppress any unnecessary output
# from stdout or stderr when executing a block of code.
#
# Reminder: any print/puts statements within the given block will
# also be suppressed since they go to stdout.
# 
# usage: suppress_output <block>
#
# eg:
#   suppress_output { ... }
# or
#   suppress_output do
#     ...
#   end
#
def suppress_output
  begin
    original_stderr = $stderr.clone
    original_stdout = $stdout.clone
    $stderr.reopen(File.new('/dev/null', 'w'))
    $stdout.reopen(File.new('/dev/null', 'w'))
    retval = yield
  rescue => e
    $stdout.reopen(original_stdout)
    $stderr.reopen(original_stderr)
    raise e
  ensure
    $stdout.reopen(original_stdout)
    $stderr.reopen(original_stderr)
  end
  retval
end