Allow mapping _ to lazy gettext path

Since nova has switched from using gettext.install for
importing the _ function to explicitly importing the _
function from gettextutils, we need to be able to enable
our deferred translation code path on the gettextutils._
function.

Change-Id: I7fec00810ea57c985e1f43c644913a9980b35655

1 files changed, 17 insertions, 1 deletions

diff --git a/openstack/common/gettextutils.py b/openstack/common/gettextutils.py
index bbf8fe9..321fdd0 100644
--- a/openstack/common/gettextutils.py
+++ b/openstack/common/gettextutils.py
@@ -38,10 +38,26 @@ _localedir = os.environ.get('oslo'.upper() + '_LOCALEDIR')
 _t = gettext.translation('oslo', localedir=_localedir, fallback=True)
 
 _AVAILABLE_LANGUAGES = []
+USE_LAZY = False
+
+
+def enable_lazy():
+    """Convenience function for configuring _() to use lazy gettext
+
+    Call this at the start of execution to enable the gettextutils._
+    function to use lazy gettext functionality. This is useful if
+    your project is importing _ directly instead of using the
+    gettextutils.install() way of importing the _ function.
+    """
+    global USE_LAZY
+    USE_LAZY = True
 
 
 def _(msg):
-    return _t.ugettext(msg)
+    if USE_LAZY:
+        return Message(msg, 'oslo')
+    else:
+        return _t.ugettext(msg)
 
 
 def install(domain, lazy=False):