class MiniPortile

def with_tempfile(filename, full_path)
  temp_file = Tempfile.new("download-#{filename}")
  temp_file.binmode
  yield temp_file
  temp_file.close
  File.unlink full_path if File.exist?(full_path)
  FileUtils.mkdir_p File.dirname(full_path)
  FileUtils.mv temp_file.path, full_path, :force => true
end