Patched Flask-Babel to support multiple gettext domains

multi-domain.patch

@@ -0,0 +1,115 @@
+--- env/lib/python2.7/site-packages/flaskext/babel.py	2013-07-13 00:00:00 +0000
++++ env/lib/python2.7/site-packages/flaskext/babel.py	2013-07-13 00:00:00 +0000
+@@ -19,6 +19,7 @@
+ from datetime import datetime
+ from flask import _request_ctx_stack
+ from babel import dates, numbers, support, Locale
++from gettext import NullTranslations
+ from werkzeug import ImmutableDict
+ try:
+     from pytz.gae import pytz
+@@ -55,9 +56,11 @@
+     })
+ 
+     def __init__(self, app=None, default_locale='en', default_timezone='UTC',
+-                 date_formats=None, configure_jinja=True):
++                 date_formats=None, configure_jinja=True,
++                 default_domain=support.Translations.DEFAULT_DOMAIN):
+         self._default_locale = default_locale
+         self._default_timezone = default_timezone
++        self._default_domain = default_domain
+         self._date_formats = date_formats
+         self._configure_jinja = configure_jinja
+         self.app = app
+@@ -77,6 +80,7 @@
+ 
+         app.config.setdefault('BABEL_DEFAULT_LOCALE', self._default_locale)
+         app.config.setdefault('BABEL_DEFAULT_TIMEZONE', self._default_timezone)
++        app.config.setdefault('BABEL_DEFAULT_DOMAIN', self._default_domain)
+         if self._date_formats is None:
+             self._date_formats = self.default_date_formats.copy()
+ 
+@@ -95,6 +99,7 @@
+ 
+         self.locale_selector_func = None
+         self.timezone_selector_func = None
++        self.domain_selector_func = None
+ 
+         if self._configure_jinja:
+             app.jinja_env.filters.update(
+@@ -142,6 +147,19 @@
+         self.timezone_selector_func = f
+         return f
+ 
++    def domainselector(self, f):
++        """Registers a callback function for domain selection.  The default
++        behaves as if a function was registered that returns `None` all the
++        time.  If `None` is returned, the domain falls back to the one from
++        the configuration.
++
++        This has to return the domain as a list of strings (eg: ``['messages']``)
++        """
++        assert self.domain_selector_func is None, \
++            'a localeselector function is already registered'
++        self.domain_selector_func = f
++        return f
++
+ 
+     def list_translations(self):
+         """Returns a list of all the locales translations exist for.  The
+@@ -178,6 +196,13 @@
+         """
+         return timezone(self.app.config['BABEL_DEFAULT_TIMEZONE'])
+ 
++    @property
++    def default_domain(self):
++        """The default domain from the configuration as instance of a
++        `string` object.
++        """
++        return self.app.config['BABEL_DEFAULT_DOMAIN']
++
+ 
+ def get_translations():
+     """Returns the correct gettext translations that should be used for
+@@ -191,7 +216,10 @@
+     translations = getattr(ctx, 'babel_translations', None)
+     if translations is None:
+         dirname = os.path.join(ctx.app.root_path, 'translations')
+-        translations = support.Translations.load(dirname, [get_locale()])
++        locale = get_locale()
++        for domain in get_domains():
++            dt = support.Translations.load(dirname, [locale], domain)
++            translations = dt if translations is None or isinstance(translations, NullTranslations) else translations.merge(dt)
+         ctx.babel_translations = translations
+     return translations
+ 
+@@ -243,6 +271,29 @@
+     return tzinfo
+ 
+ 
++def get_domains():
++    """Returns the domains that should be used for this request as
++    `list` object.  This returns `None` if used outside of
++    a request.
++    """
++    ctx = _request_ctx_stack.top
++    if ctx is None:
++        return None
++    domains = getattr(ctx, 'babel_domains', None)
++    if domains is None:
++        babel = ctx.app.extensions['babel']
++        if babel.domain_selector_func is None:
++            domains = [babel.default_domain]
++        else:
++            rv = babel.domain_selector_func()
++            if rv is None:
++                domains = [babel.default_domain]
++            else:
++                domains = rv
++        ctx.babel_domains = domains
++    return domains
++
++
+ def refresh():
+     """Refreshes the cached timezones and locale information.  This can
+     be used to switch a translation between a request and if you want

setup_venv.sh

@@ -11,4 +11,6 @@ else
 
     . $venv_dir/bin/activate
     pip install -r reqs.txt
+    # Apply multi-domain patch to Flask-Babel
+    patch -p0 <multi-domain.patch
 fi