capture_capistrano_logging.rb

require 'stringio'

class Capistrano::Logger
  class StringIOProxy < StringIO
    def initialize(proxy_target)
      @proxy_target = proxy_target
      super('')
    end
    
    def write(*args)
      @proxy_target.write(*args)
      super(*args)
    end
  end
  
  def proxy_device
    @proxy_device ||= StringIOProxy.new(@device)
  end
  
  def device
    proxy_device
  end
  
  def history
    proxy_device.rewind
    proxy_device.read
  end
end