contrib.sekizai: fix double-rendering: use TextNode, not Template

Use `TextNode(data)` instead of `Template(data).nodelist` to parse the
template only once.

The report and fix was initially provided by Aaron McMillin.

Fixes #361
Closes #362

compressor/tests/test_templatetags.py

@@ -13,14 +13,18 @@ from compressor.conf import settings
 from compressor.signals import post_compress
 from compressor.tests.test_base import css_tag, test_dir
 
+from sekizai.context import SekizaiContext
 
-def render(template_string, context_dict=None):
+
+def render(template_string, context_dict=None, context=None):
     """
     A shortcut for testing template output.
     """
     if context_dict is None:
         context_dict = {}
-    c = Context(context_dict)
+    if context is None:
+        context = Context
+    c = context(context_dict)
     t = Template(template_string)
     return t.render(c).strip()
 
@@ -126,6 +130,14 @@ class TemplatetagTestCase(TestCase):
         context = kwargs['context']
         self.assertEqual('foo', context['compressed']['name'])
 
+    def test_sekizai_only_once(self):
+        template = """{% load sekizai_tags %}{% addtoblock "js" %}
+        <script type="text/javascript">var tmpl="{% templatetag openblock %} if x == 3 %}x IS 3{% templatetag openblock %} endif %}"</script>
+        {% endaddtoblock %}{% render_block "js" postprocessor "compressor.contrib.sekizai.compress" %}
+        """
+        out = '<script type="text/javascript" src="/static/CACHE/js/e9fce10d884d.js"></script>'
+        self.assertEqual(out, render(template, self.context, SekizaiContext))
+
 
 class PrecompilerTemplatetagTestCase(TestCase):
     def setUp(self):

requirements/tests.txt

@@ -8,3 +8,4 @@ BeautifulSoup==3.2.1
 unittest2==1.0.0
 coffin==0.4.0
 jingo==0.7
+django-sekizai==0.8.2

tox.ini

@@ -10,6 +10,7 @@ two =
     unittest2==1.0.0
     jingo==0.7
     coffin==0.4.0
+    django-sekizai==0.8.2
 two_six =
     flake8==2.4.0
     coverage==3.7.1
@@ -21,6 +22,7 @@ two_six =
     unittest2==1.0.0
     jingo==0.7
     coffin==0.4.0
+    django-sekizai==0.8.2
 three =
     flake8==2.4.0
     coverage==3.7.1
@@ -31,6 +33,7 @@ three =
     beautifulsoup4==4.4.0
     jingo==0.7
     coffin==0.4.0
+    django-sekizai==0.8.2
 three_two =
     flake8==2.4.0
     coverage==3.7.1
@@ -41,6 +44,7 @@ three_two =
     beautifulsoup4==4.4.0
     jingo==0.7
     coffin==0.4.0
+    django-sekizai==0.8.2
 [tox]
 envlist =
     {py26,py27}-1.4.X,