+ impl-detail sphinx directive

pep_sphinx_extensions/__init__.py

@@ -69,6 +69,29 @@ def set_description(
         context["description"] = "Python Enhancement Proposals (PEPs)"
 
 
+class ImplementationDetail(SphinxDirective):
+
+    has_content = True
+    final_argument_whitespace = True
+
+    # This text is copied to templates/dummy.html
+    label_text = sphinx_gettext('CPython implementation detail:')
+
+    def run(self):
+        self.assert_has_content()
+        pnode = nodes.compound(classes=['impl-detail'])
+        content = self.content
+        add_text = nodes.strong(self.label_text, self.label_text)
+        self.state.nested_parse(content, self.content_offset, pnode)
+        content = nodes.inline(pnode[0].rawsource, translatable=True)
+        content.source = pnode[0].source
+        content.line = pnode[0].line
+        content += pnode[0].children
+        pnode[0].replace_self(nodes.paragraph(
+            '', '', add_text, nodes.Text(' '), content, translatable=False))
+        return [pnode]
+
+
 def setup(app: Sphinx) -> dict[str, bool]:
     """Initialize Sphinx extension."""
 
@@ -101,6 +124,8 @@ def setup(app: Sphinx) -> dict[str, bool]:
     app.add_directive("superseded", pep_banner_directive.SupersededBanner)
     app.add_directive("withdrawn", pep_banner_directive.WithdrawnBanner)
 
+    app.add_directive('impl-detail', ImplementationDetail)
+
     # Register event callbacks
     app.connect("builder-inited", _update_config_for_builder)  # Update configuration values for builder used
     app.connect("env-before-read-docs", create_pep_zero)  # PEP 0 hook