[Zope] i18n from a python script or external method

[Josef Meile]

> However, I dont need to do this with PTS - i would be happy to know the 
> five solution !
I'm using sx.translations + five in order to achive this 
programatically. In order to use i18n from five, read this:

http://codespeak.net/z3/five/i18n.html

Then install sx.translations from here:
http://www.simplistix.co.uk/software/zope/sx.translations

Please note that the product self do not compile po files into mo you 
have to compile it either manually or apply my patch:

https://secure.simplistix.co.uk/support/issue310

I did also some functions to be able to translate messages 
programatically. Please note that I'm using zope 2.8, so, I don't know 
if it will work with 2.10.x. Please also note that I'm using a request
variable called 'lang' to set the source language. If this variable
isn't set, then the browser language will be assumed.

Best regards
Josef

-------->Code

from zope.component import getUtility
from zope.i18n.interfaces import ILanguageAvailability
from zope.i18n.interfaces import INegotiator
from zope.i18nmessageid.messageid import MessageID
from zope.i18n import translate as _

def getSupportedLanguages(domain=None):
   """Gets the supported languages for a Message catalog"""
   options = getUtility(ILanguageAvailability,
                        domain).getAvailableLanguages()
   options.sort()
   langCodes = []
   for option in options:
     langCodes.append(option[0])

   return langCodes

DEFAULT_LANGUAGE = u'en'
def getLanguage(context,domain=None,optionsDict = {}):
   """Gets the current language of the user browser"""
   context = getattr(context,'REQUEST',context)
   lang = optionsDict.get('lang',None)
   if lang not in [None,'']:
     context.set('lang',lang)

   supportedLanguages = getSupportedLanguages(domain)
   negotiator = getUtility(INegotiator)
   currentLang = negotiator.getLanguage(supportedLanguages,context)
   if currentLang in ['', None]:
     #We failed to get the browser's language, so, the default will be 
assumed
     currentLang = DEFAULT_LANGUAGE

   return currentLang

def useTranslationService(context, msgid, domain = None, mapping = None, 
lang = None,
                           default = None):
   """Uses the TranslationService from python"""
   context = getattr(context,'REQUEST',context)

   isMessageId = (type(msgid) == MessageID)
   if lang is None:
     if isMessageId:
       domain = msgid.domain
     lang = getLanguage(context,domain)

   if default is None:
     default = msgid

   if isMessageId:
     #A MessageId object already has everything on it: domain, mapping, 
and a
     #default value, so, we don't need to pass them here
     translation = _(msgid, target_language = lang, context = context)
   else:
     translation = _(msgid,
                     domain = domain,
                     mapping = mapping,
                     target_language = lang,
                     default = default,
                     context = context)
   return translation