Added custom template loader to CMS in order to enable {% include %} and {% import %} in jinja temp…

sitescripts/cms/converters.py

Index: sitescripts/cms/converters.py
===================================================================
--- a/sitescripts/cms/converters.py
+++ b/sitescripts/cms/converters.py
@@ -172,6 +172,16 @@
     return result
 
 class TemplateConverter(Converter):
+  class _SourceLoader(jinja2.BaseLoader):
+    def __init__(self, source):
+      self.source = source
+
+    def get_source(self, environment, template):
+      try:
+        return self.source.read_include(template, "tmpl"), None, None
+      except Exception:
+        raise jinja2.TemplateNotFound(template)
+
   def __init__(self, *args, **kwargs):
     Converter.__init__(self, *args, **kwargs)
 
@@ -197,7 +207,7 @@
       filters[func] = getattr(module, func)
       filters[func].module_ref = module  # Prevent garbage collection
 
-    self._env = get_custom_template_environment(filters)
+    self._env = get_custom_template_environment(filters, self._SourceLoader(self._params["source"]))
 
   def get_html(self, source):
     template = self._env.from_string(source)