323 def can_do_pdf_conversion(__answer=[None]):

   324     """pdf conversion depends on

   325     * pyxmltrf (python package)

   326     * fop 0.9x

   327     """

   328     if __answer[0] is not None:

   329         return __answer[0]

   330     try:

   331         import pyxmltrf

   332     except ImportError:

   333         __answer[0] = False

   334         return False

   335     from subprocess import Popen, STDOUT

   336     import os

   337     try:

   338         Popen(['/usr/bin/fop', '-q'],

   339               stdout=open(os.devnull, 'w'),

   340               stderr=STDOUT)

   341     except OSError, e:

   342         print e

   343         __answer[0] = False

   344         return False

   345     __answer[0] = True

   346     return True