[WIP] Support rendering variables in footnotes

docxtpl/template.py

@@ -350,6 +350,23 @@ def render_properties(
             template = jinja_env.from_string(initial)
             rendered = template.render(context)
             setattr(self.docx.core_properties, prop, rendered)
+
+    def render_footnotes(
+            self, context: Dict[str, Any], jinja_env: Optional[Environment] = None
+   ) -> None:
+        if jinja_env is None:
+            jinja_env = Environment()
+
+        for k, v in self.docx.sections[0].part.related_parts.items():
+            if v.content_type == 'application/vnd.openxmlformats-officedocument.wordprocessingml.footnotes+xml':
+                import xml.etree.ElementTree as ET
+                tree = ET.fromstring(v.blob)
+                for footnote in tree.findall('.//w:t', docx.oxml.ns.nsmap):
+                    if hasattr(footnote, 'text'):
+                        footnote.text = jinja_env.from_string(footnote.text).render(context)
+                for part in self.docx.sections[0].part.related_parts[k].package.parts:
+                    if part.partname == v.partname:
+                        part._blob = ET.tostring(tree, encoding='unicode').encode('utf8')
 
     def resolve_listing(self, xml):
 
@@ -483,6 +500,8 @@ def render(
 
         self.render_properties(context, jinja_env)
 
+        self.render_footnotes(context, jinja_env)
+
         # set rendered flag
         self.is_rendered = True