--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/cwgettext.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,118 @@
+# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of CubicWeb.
+#
+# CubicWeb is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+
+import gettext
+
+
+class cwGNUTranslations(gettext.GNUTranslations):
+    # The encoding of a msgctxt and a msgid in a .mo file is
+    # msgctxt + "\x04" + msgid (gettext version >= 0.15)
+    CONTEXT_ENCODING = "%s\x04%s"
+
+    def pgettext(self, context, message):
+        ctxt_msg_id = self.CONTEXT_ENCODING % (context, message)
+        missing = object()
+        tmsg = self._catalog.get(ctxt_msg_id, missing)
+        if tmsg is missing:
+            if self._fallback:
+                return self._fallback.pgettext(context, message)
+            return message
+        # Encode the Unicode tmsg back to an 8-bit string, if possible
+        if self._output_charset:
+            return tmsg.encode(self._output_charset)
+        elif self._charset:
+            return tmsg.encode(self._charset)
+        return tmsg
+
+    def lpgettext(self, context, message):
+        ctxt_msg_id = self.CONTEXT_ENCODING % (context, message)
+        missing = object()
+        tmsg = self._catalog.get(ctxt_msg_id, missing)
+        if tmsg is missing:
+            if self._fallback:
+                return self._fallback.lpgettext(context, message)
+            return message
+        if self._output_charset:
+            return tmsg.encode(self._output_charset)
+        return tmsg.encode(locale.getpreferredencoding())
+
+    def npgettext(self, context, msgid1, msgid2, n):
+        ctxt_msg_id = self.CONTEXT_ENCODING % (context, msgid1)
+        try:
+            tmsg = self._catalog[(ctxt_msg_id, self.plural(n))]
+            if self._output_charset:
+                return tmsg.encode(self._output_charset)
+            elif self._charset:
+                return tmsg.encode(self._charset)
+            return tmsg
+        except KeyError:
+            if self._fallback:
+                return self._fallback.npgettext(context, msgid1, msgid2, n)
+            if n == 1:
+                return msgid1
+            else:
+                return msgid2        
+
+    def lnpgettext(self, context, msgid1, msgid2, n):
+        ctxt_msg_id = self.CONTEXT_ENCODING % (context, msgid1)
+        try:
+            tmsg = self._catalog[(ctxt_msg_id, self.plural(n))]
+            if self._output_charset:
+                return tmsg.encode(self._output_charset)
+            return tmsg.encode(locale.getpreferredencoding())
+        except KeyError:
+            if self._fallback:
+                return self._fallback.lnpgettext(context, msgid1, msgid2, n)
+            if n == 1:
+                return msgid1
+            else:
+                return msgid2
+
+    def upgettext(self, context, message):
+        ctxt_message_id = self.CONTEXT_ENCODING % (context, message)
+        missing = object()
+        tmsg = self._catalog.get(ctxt_message_id, missing)
+        if tmsg is missing:
+            # XXX logilab patch for compat w/ catalog generated by cw < 3.5
+            return self.ugettext(message)
+            if self._fallback:
+                return self._fallback.upgettext(context, message)
+            return unicode(message)
+        return tmsg
+
+    def unpgettext(self, context, msgid1, msgid2, n):
+        ctxt_message_id = self.CONTEXT_ENCODING % (context, msgid1)
+        try:
+            tmsg = self._catalog[(ctxt_message_id, self.plural(n))]
+        except KeyError:
+            if self._fallback:
+                return self._fallback.unpgettext(context, msgid1, msgid2, n)
+            if n == 1:
+                tmsg = unicode(msgid1)
+            else:
+                tmsg = unicode(msgid2)
+        return tmsg
+
+
+def translation(domain, localedir=None, languages=None,
+                class_=None, fallback=False, codeset=None):
+    if class_ is None:
+        class_ = cwGNUTranslations
+    return gettext.translation(domain, localedir=localedir,
+                               languages=languages, class_=class_,
+                               fallback=fallback, codeset=codeset)