Render built-in macros from Liquid templates.

crates/bds-core/tests/m4_page_renderer.rs

@@ -91,6 +91,26 @@ fn markdown_filter_expands_builtin_macros_from_runtime_context() {
     assert!(rendered.contains("data-tag-cloud=\"true\""));
 }
 
+#[test]
+fn markdown_filter_uses_project_macro_template_overrides() {
+    let template = "{{ body | markdown: nil, nil, canonical_post_path_by_slug, canonical_media_path_by_source_path, language, language_prefix }}";
+    let context = serde_json::json!({
+        "body": "[[youtube id=custom-id]]",
+        "macro_templates": {
+            "youtube": "<figure data-video=\"{{ id | escape }}\">custom</figure>"
+        },
+        "canonical_post_path_by_slug": {},
+        "canonical_media_path_by_source_path": {},
+        "language": "en",
+        "language_prefix": ""
+    });
+
+    let rendered = render_liquid_template(template, &HashMap::new(), &context).unwrap();
+
+    assert!(rendered.contains("<figure data-video=\"custom-id\">custom</figure>"));
+    assert!(!rendered.contains("macro-youtube"));
+}
+
 #[test]
 fn markdown_filter_leaves_unknown_macros_verbatim() {
     let template = "{{ body | markdown: nil, nil, canonical_post_path_by_slug, canonical_media_path_by_source_path, language, language_prefix }}";