From fa16b8910efd576746fbcdece9eaa0bfbe9499b0 Mon Sep 17 00:00:00 2001
From: Christophe Simonis <chs@openerp.com>
Date: Mon, 12 Nov 2012 19:10:33 +0100
Subject: [PATCH] [ADD] req.lang property to get preferred lang for the current
 request

bzr revid: chs@openerp.com-20121112181033-b17zj2io47me04kk
---
 addons/web/controllers/main.py |  4 +---
 addons/web/http.py             | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 42731c5aa3c..ffabe97661b 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -691,12 +691,10 @@ class WebClient(openerpweb.Controller):
             until we have established a valid session. This is meant only
             for translating the login page and db management chrome, using
             the browser's language. """
-        lang = req.httprequest.accept_languages.best or 'en'
         # For performance reasons we only load a single translation, so for
         # sub-languages (that should only be partially translated) we load the
         # main language PO instead - that should be enough for the login screen.
-        if '-' in lang: # RFC2616 uses '-' separators for sublanguages
-            lang = lang.split('-')[0]
+        lang = req.lang.split('_')[0]
 
         translations_per_module = {}
         for addon_name in mods:
diff --git a/addons/web/http.py b/addons/web/http.py
index 1a636971fb5..65111cd6775 100644
--- a/addons/web/http.py
+++ b/addons/web/http.py
@@ -21,6 +21,7 @@ import urlparse
 import uuid
 import xmlrpclib
 
+from babel.core import LOCALE_ALIASES
 import simplejson
 import werkzeug.contrib.sessions
 import werkzeug.datastructures
@@ -93,7 +94,28 @@ class WebRequest(object):
         if not self.session:
             self.httpsession[self.session_id] = self.session = session.OpenERPSession()
         self.context = self.params.pop('context', None)
-        self.debug = self.params.pop('debug', False) != False
+        self.debug = self.params.pop('debug', False) is not False
+        self._params_lang = self.params.pop('lang')
+
+    @property
+    def lang(self):
+        if not hasattr(self, '_lang'):
+            lang = self._params_lang
+            if lang is None:
+                lang = self.httprequest.cookies.get('lang')
+            if lang is None:
+                context = self.session.eval_context(self.context)
+                lang = context.get('lang')
+            if lang is None:
+                lang = self.httprequest.accept_languages.best
+            if lang is None:
+                lang = 'en_US'
+
+            lang = LOCALE_ALIASES.get(lang, lang)
+            lang = lang.replace('-', '_')  # RFC2616 uses '-' separators for sublanguages
+            self._lang = lang
+        return self._lang
+
 
 class JsonRequest(WebRequest):
     """ JSON-RPC2 over HTTP.