--- a/docs/conf.py	Sat May 16 21:58:06 2026 +0200
+++ b/docs/conf.py	Sat May 16 22:27:13 2026 +0200
@@ -255,6 +255,34 @@
 autoclass_content = 'both'
 
 
+class IAMCustomSubstitutions(sphinx.transforms.SphinxTransform):
+
+    """Implement custom variable substitutions"""
+
+    default_priority = sphinx.transforms.DefaultSubstitutions.default_priority
+
+    _SUBSTITUTIONS = {
+        "release_date": release_date,
+        "release_rev": release_rev
+    }
+    if define_rest_keywords:
+        _SUBSTITUTIONS.update(
+            {"VCSJustDate": release_date,
+             "VCSRevision": release_rev,
+             "VCSHGRevision": release_rev})
+
+    def apply(self):
+        from docutils import nodes
+        for ref in self.document.traverse(nodes.substitution_reference):
+            refname = ref['refname']
+            if refname in self._SUBSTITUTIONS:
+                stext = self._SUBSTITUTIONS[refname]
+                ref.replace_self(nodes.Text(stext, stext))
+            #if refname in ('release_date' 'release_rev'):
+            #    stext = self.config[refname]
+            #    ref.replace_self(nodes.Text(stext, stext))
+
+
 def setup(app):
     logger = sphinx.util.logging.getLogger("conf-setup")
     logger.info("Release:      %s", release)
@@ -267,30 +295,5 @@
     #
     app.add_config_value('release_date', '', 'env')
     app.add_config_value('release_rev', '', 'env')
-
-    class IAMCustomSubstitutions(sphinx.transforms.SphinxTransform):
-
-        default_priority = sphinx.transforms.DefaultSubstitutions.default_priority
-
-        SUBSTITUTIONS = {
-            "release_date": release_date,
-            "release_rev": release_rev
-        }
-        if define_rest_keywords:
-            SUBSTITUTIONS.update(
-                {"VCSJustDate": release_date,
-                 "VCSRevision": release_rev,
-                 "VCSHGRevision": release_rev})
-
-        def apply(self):
-            from docutils import nodes
-            for ref in self.document.traverse(nodes.substitution_reference):
-                refname = ref['refname']
-                if refname in self.SUBSTITUTIONS:
-                    stext = self.SUBSTITUTIONS[refname]
-                    ref.replace_self(nodes.Text(stext, stext))
-                #if refname in ('release_date' 'release_rev'):
-                #    stext = self.config[refname]
-                #    ref.replace_self(nodes.Text(stext, stext))
-
+    # Custom variable substitution
     app.add_transform(IAMCustomSubstitutions)