Adding support for microsite template_paths on django templates

Stripping the leading / for the django_templates finder

Enabling the microsite configurations before running django.setup()

Adding only the templates directory before startup

Adding the missing overrides file at the django templates main

Using the comp_theming way of overriding css

Adding test for the microsite_template_path filter

common/djangoapps/microsite_configuration/templatetags/microsite.py

@@ -63,3 +63,14 @@ def microsite_css_overrides_file():
         return "<link href='{}' rel='stylesheet' type='text/css'>".format(static(file_path))
     else:
         return ""
+
+
+@register.filter
+def microsite_template_path(template_name):
+    """
+    Django template filter to apply template overriding to microsites.
+    The django_templates loader does not support the leading slash, therefore
+    it is stripped before returning.
+    """
+    template_name = microsite.get_template_path(template_name)
+    return template_name[1:] if template_name[0] == '/' else template_name

common/djangoapps/microsite_configuration/tests/test_microsites.py

@@ -32,3 +32,10 @@ class MicroSiteTests(TestCase):
         expected = u'my | less specific | Page | edX'
         title = microsite.page_title_breadcrumbs_tag(None, *crumbs)
         self.assertEqual(expected, title)
+
+    def test_microsite_template_path(self):
+        """
+        When an unexistent path is passed to the filter, it should return the same path
+        """
+        path = microsite.microsite_template_path('footer.html')
+        self.assertEqual("footer.html", path)