make template overrides take final and prev

website/content/default.nix

@@ -9,14 +9,12 @@ in
   collections.news.type = cfg.content-types.article;
 
   pages.index = { config, link, ... }: {
-    title = "Fediversity";
+    title = "Welcome to the Fediversity project";
     description = "Fediversity web site";
     summary = ''
       This web site hosts up-to-date information about the the NGI Zero Fediversity project.
     '';
     body = ''
-      # Welcome to the Fediversity project
-
       ${pages.fediversity.summary}
 
       [Learn more about Fediversity](${link pages.fediversity})
@@ -61,11 +59,7 @@ in
       }
     '';
     outputs.html = (cfg.templates.html.page config).override {
-      html.body.content = lib.mkForce [
-        # don't show the page title as a heading
-        (cfg.menus.main.outputs.html config)
-        (cfg.templates.html.markdown { inherit (config) name body; })
-      ];
+      html.head.title.text = "Fediversity";
     };
   };
 }

website/lib.nix

@@ -8,7 +8,11 @@ rec {
     result // {
       override = new:
         let
-          base' = lib.recursiveUpdate base new;
+          base' =
+            if lib.isFunction new
+            then lib.recursiveUpdate base (new base' base)
+            else
+              lib.recursiveUpdate base new;
           result' = g base';
         in
         result' // {

website/structure/article.nix

@@ -27,28 +27,26 @@ in
       };
     };
     config.name = lib.slug config.title;
-    config.outputs.html = lib.mkForce ((cfg.templates.html.page config).override {
+    config.outputs.html = lib.mkForce
+      ((cfg.templates.html.page config).override (final: prev: {
         html = {
           # TODO: make authors always a list
           head.meta.authors = if lib.isList config.author then config.author else [ config.author ];
-        body.content = lib.mkForce [
-          (cfg.menus.main.outputs.html config)
+          body.content = with lib; map
+            (e:
+              if isAttrs e && e ? section
+              then
+                recursiveUpdate e
                   {
-            section = {
-              heading = {
-                # TODO: i18n support
-                # TODO: structured dates
+                    section.heading = {
                       before = [{ p.content = "Published ${config.date}"; }];
-                content = config.title;
                       after = [{ p.content = "Written by ${config.author}"; }];
                     };
-              content = [
-                (cfg.templates.html.markdown { inherit (config) name body; })
-              ];
-            };
-          }
-        ];
-      };
-    });
+                  }
+              else e
+            )
+            prev.html.body.content;
+        };
+      }));
   };
 }