new_contents: # -*- coding: utf-8 -*-
  # vi:si:et:sw=4:sts=4:ts=4
  
  ##
  ## Copyright (C) 2007 Async Open Source <http://www.async.com.br>
  ## All rights reserved
  ##
  ## This program is free software; you can redistribute it and/or modify
  ## it under the terms of the GNU Lesser General Public License as published by
  ## the Free Software Foundation; either version 2 of the License, or
  ## (at your option) any later version.
  ##
  ## This program is distributed in the hope that it will be useful,
  ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ## GNU Lesser General Public License for more details.
  ##
  ## You should have received a copy of the GNU Lesser General Public License
  ## along with this program; if not, write to the Free Software
  ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  ## USA.
  ##
  ## Author(s): Johan Dahlin              <jdahlin@async.com.br>
  ##
  #
  # Documentation references:
  #
  #   http://en.wikipedia.org/wiki/ESC/P
  #   http://www.epson.co.uk/support/manuals/pdf/ESCP/Part_1.pdf
  #   http://www.epson.co.uk/support/manuals/pdf/ESCP/Part_2.pdf
  #
  """ Driver for EPSON Esc/P and Esc/P2 printers. """
  
  import struct
  
  ESC = '\x1b'
  
  CMD_INIT = '@'
  CMD_PRINT_QUALITY = 'x'
  CMD_PROPORTIONAL = 'p'
  CMD_FORM_FEED = '\xff'
  CMD_EJECT = '\x19'
  
  QUALITY_DRAFT = '0'
  QUALITY_LQ = '1'
  QUALITY_NLQ = '1'
  
  class EscPPrinter(object):
      def __init__(self, device):
          self.device = device
          self.fp = open(device, 'w')
  
          self._command(CMD_INIT)
  
      def _command(self, command, *args):
          chars = command
          for arg in args:
              if arg == True:
                  v = '1'
              elif arg == False:
                  v = '0'
              else:
                  v = arg
  
              chars += v
          cmd = '%s%s' % (ESC, chars)
          self.send(cmd)
  
      def send(self, data):
          self.fp.write(data)
          self.fp.flush()
  
      def set_draft_mode(self):
          self._command(CMD_PRINT_QUALITY, QUALITY_DRAFT)
  
      def set_proportional(self, proportional):
          self._command(CMD_PROPORTIONAL, proportional)
  
      def done(self):
          self._command(CMD_INIT)
  
      def form_feed(self):
          self._command(CMD_FORM_FEED)
  
      def set_vertical_position(self, position):
          args = struct.pack('b', position)
          self._command('J', *args)
  
  def test():
      printer = EscPPrinter('/dev/lp0')
      printer.send(
          'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. '
          'Ut a velit sit amet nisl hendrerit lacinia. Nunc eleifend '
          'cursus risus. Vivamus libero libero, dignissim ut, pulvinar id, '
          'blandit a, leo amet.\n'.upper())
  
      printer.done()
  
  if __name__ == '__main__':
      test()
  
subject: Add an initial Esc/P printer