Shows how to call the kakadu library with envoy; handles paths with spaces and a source-path with apostrophes.

make_kakadu_jp2.py

# -*- coding: utf-8 -*-

""" Shows how to call the kakadu library with envoy.
    In particular, shows how to handle paths containing spaces.
    Updated to show how to handle apostrophe in source path.
    - kakadu is a jpeg2000 library
    - envoy is a wrapper around the subprocess module
    - kakadu: http://en.wikipedia.org/wiki/Kakadu_(software)
    - envoy: https://github.com/kennethreitz/envoy
    """

import envoy

KAKADU_COMMAND_PATH = u'/opt/local/djatoka/bin/Linux-x86-32/kdu_compress'  # example

k_source_file_path = u"'%s'" % u'/the/source/file path'.replace( u' ', u'\ ' )
k_source_file_path2 = k_source_file_path.replace( u"'", u"\\'" )
k_destination_file_path = u"'%s'" % u'/the/destination/file path'.replace( u' ', u'\ ' )
cmd = u'%s -i %s -o %s Creversible=yes -rate -,1,0.5,0.25 Clevels=5' % (
  KAKADU_COMMAND_PATH,
  k_source_file_path2,
  k_destination_file_path
  )
r = envoy.run( cmd.encode(u'utf-8', u'replace') )  # envoy requires a non-unicode string

# print r.std_out
# print r.std_err