xlsx2csv using uno

#!/usr/bin/env python2
import sys
import os
from os.path import abspath, isfile, splitext
import signal
import time

sys.path.append('/usr/lib64/libreoffice/program')
import uno
from com.sun.star.beans import PropertyValue

def _toProperties(**args):
    props = []
    for key in args:
        prop = PropertyValue()
        prop.Name = key
        prop.Value = args[key]
        props.append(prop)
    return tuple(props)

# start first
# libreoffice --headless --accept="socket,host=0,port=8100,tcpNoDelay=1;urp"


def conv(fi):
  print ("CONVERT %s" % fi)
  fo = fi.replace('.xlsx','.csv')
  if fi == fo:
    desktop.terminate()
    raise BaseException("OOPS [%s] == [%s]" % (fi, fo))

  inputFile = uno.systemPathToFileUrl(abspath(fi))
  outputFile = uno.systemPathToFileUrl(abspath(fo))

  # load, calculateAll(), save
  document = desktop.loadComponentFromURL(inputFile, "_blank", 0, ())
  document.calculateAll()

  # csv
  document.storeToURL(outputFile, _toProperties(FilterName="Text - txt - csv (StarCalc)", FilterOptions="44,34,76,1"))

cmd = "localc \"--accept=socket,host=localhost,port=8100;urp;StarOffice.ServiceManager\" --nologo --headless --nofirststartwizard"

pid = os.fork()

if not pid:
  os.system(cmd)
  sys.exit(1)

print ("FORKED pid=%d" % pid)

time.sleep(5)

# import the OpenOffice component context
local = uno.getComponentContext()
# access the UnoUrlResolver service - this will allow to connect to OpenOffice.org program
resolver = local.ServiceManager.createInstanceWithContext("com.sun.star.bridge.UnoUrlResolver", local)
# load the context and you are now connected - you can access OpenOffice via its API mechanism
context = resolver.resolve("uno:socket,host=localhost,port=8100;urp;StarOffice.ServiceManager")
remoteContext = context.getPropertyValue("DefaultContext")

# service responsible for the current document called desktop
desktop = context.createInstanceWithContext("com.sun.star.frame.Desktop", remoteContext)
document = desktop.getCurrentComponent()

for f in sys.argv[1:]:
  conv(f)

desktop.terminate()