Writes to both STDOUT and the specified file; can include as many IO streams as you want

multi_io.rb

# Usage example:
#
# log_filename = File.join(log_path, "#{Sinatra::Base.environment.to_s}.log")
# $log_file = File.open(log_filename, 'a+')
#
# STDOUT.sync = true if 'yes' == ENV['API_DEBUG']
# $log_file.sync = true if 'yes' == ENV['API_DEBUG']
#
# require 'logger'
# $logger = Logger.new MultiIO.new(STDOUT, $log_file)
# $logger.level = Logger::DEBUG
#
# ...
#
# #writes to both STDOUT and the specified file
# #can include as many IO streams as you want
#
# $logger.debug("load Mongo")

class MultiIO
  def initialize(*targets)
     @targets = targets
  end

  def write(*args)
    @targets.each {|t| t.write(*args)}
  end

  def close
    @targets.each(&:close)
  end
end