jinja2: new assert function

CHANGES.txt

+2.8 (2015-06-25)
+================
+
+* jinja2: new assert function.
+
 2.7 (2015-05-18)
 ================
 

setup.py

 from setuptools import setup, find_packages
 import os
 
-version = '2.7'
+version = '2.8'
 name = 'slapos.recipe.template'
 long_description = open("README.txt").read() + "\n" + \
     open(os.path.join('slapos', 'recipe',

slapos/recipe/template/jinja2_template.py

@@ -38,6 +38,12 @@ DEFAULT_CONTEXT = {x.__name__: x for x in (
   isinstance, iter, len, list, map, max, min, next, oct, ord,
   pow, repr, reversed, round, set, sorted, str, sum, tuple, zip)}
 
+def _assert(x, *args):
+    if x:
+        return ""
+    raise AssertionError(*args)
+DEFAULT_CONTEXT['assert'] = _assert
+
 _buildout_safe_dumps = getattr(zc.buildout.buildout, 'dumps', None)
 DUMPS_KEY = 'dumps'
 DEFAULT_IMPORT_DELIMITER = '/'