How to use the i18ndude.catalog function in i18ndude

def testI18Ngenerator(self):
        '''Runs the i18ngenerator'''

        ctl = {}
        ctl['plone'] = catalog.MessageCatalog(domain='plone')

        # global actions
        for provider in self.action_tool.listActionProviders():
            provider_tool = getToolByName(self.portal, provider, None)
            for action in provider_tool.listActions():
                title = norm(action.title)
                if action.visible:
                    ctl['plone'].add(title, msgstr=title, references=['action defined in %s' % provider])

        # description of action icons
        for icon in self.ai_tool.listActionIcons():
            title= icon.getTitle()
            ctl['plone'].add(title, msgstr=title, references=['action_icon id %s - category %s' % (icon.getIconURL(), icon.getCategory())])


        # workflow states and worflow transitions

for attype in self.at_tool.listRegisteredTypes():
            # typename = attype['name']
            schema = attype['schema']
            for field in schema.fields():
                if not isinstance(field, ReferenceField):
                    domain = field.widget.__dict__.get('i18n_domain')
                    vocab = field.Vocabulary()
                    if isinstance(vocab, DisplayList):
                        for key in vocab:
                            value = vocab.getValue(key)
                            if len(value) > 1:
                                msgid = vocab.getMsgId(key)
                                if domain == None:
                                    domain = 'plone'
                                if not domain in ctl.keys():
                                    ctl[domain] = catalog.MessageCatalog(domain=domain)
                                ctl[domain].add(msgid, msgstr=value, references=['DisplayList entry for field %s' % field.getName()])

        # archetypes widgets XXX Should be merged with the DisplayList stuff

        for widget in self.at_tool.getWidgets():
            w = widget._args.get('widget')
            dict = w.__dict__
            domain = dict.get('i18n_domain')
            if domain:
                if not domain in ctl.keys():
                    ctl[domain] = catalog.MessageCatalog(domain=domain)
                label = dict.get('label')
                label_msgid = dict.get('label_msgid')
                desc = norm(dict.get('description'))
                desc_msgid = dict.get('description_msgid')

sys.exit(1)

    product = getLongProductName(sys.argv[1])
    projectid = sys.argv[2]

    os.chdir('..')
    os.chdir('i18n')

    poFiles = getPoFiles(product, all=True)
    if poFiles == []:
        print('No po-files were found for the given product.')
        sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)
        po_ctl.mime_header['Project-Id-Version'] = projectid
        file = open(poFile, 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

print('You have to specify the product.')
        sys.exit(1)

    product = getLongProductName(sys.argv[1])

    os.chdir('..')
    os.chdir('i18n')

    poFiles = getPoFiles(product, all=True)
    if poFiles == []:
        print('No po-files were found for the given product.')
        sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)

        try:
            language = po_ctl.commentary_header[0].split('to ')[1:][0]
            po_ctl.commentary_header[0] = 'Translation of '+product+'.pot to '+language
        except IndexError:
            print(poFile)

        file = open(poFile+'-new', 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

os.chdir('..')
    os.chdir('i18n')

    poFiles = getPoFiles(product, all=True)
    if poFiles == []:
        print('No po-files were found for the given product.')
        sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)
        po_ctl.mime_header['Domain'] = domain
        file = open(poFile, 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

os.chdir('..')
    os.chdir('i18n')

    poFiles = getPoFiles(product, all=True)
    if poFiles == []:
        print('No po-files were found for the given product.')
        sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)
        po_ctl.mime_header['Project-Id-Version'] = projectid
        file = open(poFile, 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)

        try:
            language = po_ctl.commentary_header[0].split('to ')[1:][0]
            po_ctl.commentary_header[0] = 'Translation of '+product+'.pot to '+language
        except IndexError:
            print(poFile)

        file = open(poFile+'-new', 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

sys.exit(1)

    product = getLongProductName(sys.argv[1])
    domain = sys.argv[2]

    os.chdir('..')
    os.chdir('i18n')

    poFiles = getPoFiles(product, all=True)
    if poFiles == []:
        print('No po-files were found for the given product.')
        sys.exit(2)

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)
        po_ctl.mime_header['Domain'] = domain
        file = open(poFile, 'w')
        writer = catalog.POWriter(file, po_ctl)
        writer.write(sort=False)

product = sys.argv[1]

    os.chdir('..')

    poFiles = getPoFiles(product, all=True)
    if poFiles == '':
        print 'No po-files were found for the given product.'
        sys.exit(2)

    old = sys.argv[2]
    new = sys.argv[3]

    for poFile in poFiles:
        try:
            po_ctl = catalog.MessageCatalog(filename=poFile)
        except IOError, e:
            print >> sys.stderr, 'I/O Error: %s' % e

        try:
            msgids = po_ctl.keys()
            if old in msgids:
                if new in msgids:
                    print 'New message already in %s' % poFile
                else:
                    po_ctl[new] = po_ctl.get(old)
                    print 'Copied %s into %s in file %s' % (old, new, poFile)
            else:
                print 'Old message not found in %s' % poFile
        except IndexError:
            print poFile

'label_related_items', 'label_short_name',
                   'label_string_criteria_value', 'label_url',
                  ]
                }

    # make sure we only try on languages for which both po files exist
    ploneLanguages = [getLanguage('plone', p) for p in poFilesPlone]
    atctLanguages = [getLanguage('atcontenttypes', p) for p in poFilesATCT]

    languages = [l for l in ploneLanguages if l in atctLanguages and l != 'en']
    changes = {'plone' : False, 'atcontenttypes' : False}

    for lang in languages:
        po_ctl = {}
        try:
            po_ctl['plone'] = catalog.MessageCatalog(filename='plone-%s.po' % lang)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)
        try:
            po_ctl['atcontenttypes'] = catalog.MessageCatalog(filename='atcontenttypes-%s.po' % lang)
        except IOError as e:
            print('I/O Error: %s' % e, file=sys.stderr)

        changes = {'plone' : False, 'atcontenttypes' : False}

        relocate_domain = {'plone' : 'atcontenttypes', 'atcontenttypes' : 'plone'}

        msgids = {}
        msgids['plone'] = list(po_ctl['plone'].keys())
        msgids['atcontenttypes'] = list(po_ctl['atcontenttypes'].keys())

        for old_domain in relocated: