Uses inkscape to export an svg file using an optional, external CSS file.

exportsvg.py

import os
import xml.dom.minidom
from optparse import OptionParser

# usage exportsvg whatever.svg --css=abc.css --output=whatever.png
# uses inkscape
if __name__ == '__main__':
  parser = OptionParser()
  parser.add_option("-c", "--css", dest="css", help="CSS stylesheet to use when exporting")
  parser.add_option("-o", "--output", dest="output", help="specify the output file to use")

  (options, args) = parser.parse_args()

  if len(args) < 1:
    print '[error] input SVG must be supplied'
    exit(1)
  
  infile = args[0]
  
  filetype = None
  if options.output == None:
    if infile.find('.') != -1:
      infile_root = infile[0:infile.find('.')]
    print '[note] no output file specified, outputting to %s.png' % infile_root
    options.output = '%s.png' % infile_root
    filetype = 'png'
  else:
    if options.output.find('.') == -1:
      print '[error] cannot determine file type from \'%s\'' % options.output
      exit(1)

    filetype = options.output[options.output.find('.') + 1:]

    if filetype != 'png':
      print '[error] unknown output file type \'%s\'' % filetype
      exit(1)

  if options.css != None:
    inf = open(infile, 'r')
    dom = xml.dom.minidom.parseString(inf.read())
    inf.close()

    defs = dom.getElementsByTagName('defs')
    if len(defs) == 0:
      defs = [dom.createElement('defs')]
      dom.documentElement.appendChild(defs[0])

    style = dom.createElement('style')
    defs[0].appendChild(style)

    cssf = open(options.css, 'r')
    styletxt = dom.createTextNode(cssf.read())
    cssf.close()

    style.appendChild(styletxt)

    tmpf = open('_' + infile, 'w+')
    dom.writexml(tmpf, '', '  ', '\n')
    tmpf.close()
    
    infile = '_' + infile

  if filetype == 'png':
    os.system('inkscape --export-png=\'%s\' %s' % (options.output, infile))

  if options.css != None:
    os.remove(infile)