1 files changed, 79 insertions, 0 deletions
diff --git a/vhosts/blog/nuldoc-src/generators/atom.ts b/vhosts/blog/nuldoc-src/generators/atom.ts
new file mode 100644
index 00000000..6ad07b46
--- /dev/null
+++ b/vhosts/blog/nuldoc-src/generators/atom.ts
@@ -0,0 +1,79 @@
+import { Config } from "../config.ts";
+import { Page } from "../page.ts";
+import { PostPage } from "../generators/post.ts";
+import { SlidePage } from "../generators/slide.ts";
+import { dateToRfc3339String } from "../revision.ts";
+import AtomPage from "../pages/AtomPage.tsx";
+import { renderToDOM } from "../jsx/render.ts";
+
+export type Feed = {
+  author: string;
+  icon: string;
+  id: string;
+  linkToSelf: string;
+  linkToAlternate: string;
+  title: string;
+  updated: string;
+  entries: Entry[];
+};
+
+export type Entry = {
+  id: string;
+  linkToAlternate: string;
+  published: string;
+  summary: string;
+  title: string;
+  updated: string;
+};
+
+const BASE_NAME = "atom.xml";
+
+export async function generateFeedPageFromEntries(
+  alternateLink: string,
+  feedSlug: string,
+  feedTitle: string,
+  entries: Array<PostPage | SlidePage>,
+  config: Config,
+): Promise<Page> {
+  const entries_: Entry[] = [];
+  for (const entry of entries) {
+    entries_.push({
+      id: `urn:uuid:${entry.uuid}`,
+      linkToAlternate: `https://${config.blog.fqdn}${entry.href}`,
+      title: entry.title,
+      summary: entry.description,
+      published: dateToRfc3339String(entry.published),
+      updated: dateToRfc3339String(entry.updated),
+    });
+  }
+  // Sort by published date in ascending order.
+  entries_.sort((a, b) => {
+    if (a.published < b.published) {
+      return 1;
+    } else if (a.published > b.published) {
+      return -1;
+    }
+    return 0;
+  });
+  const feedPath = `${alternateLink}${BASE_NAME}`;
+  const feed: Feed = {
+    author: config.blog.author,
+    icon: `https://${config.blog.fqdn}/favicon.svg`,
+    id: `tag:${config.blog.fqdn},${config.blog.siteCopyrightYear}:${feedSlug}`,
+    linkToSelf: `https://${config.blog.fqdn}${feedPath}`,
+    linkToAlternate: `https://${config.blog.fqdn}${alternateLink}`,
+    title: feedTitle,
+    updated: entries_.reduce(
+      (latest, entry) => entry.updated > latest ? entry.updated : latest,
+      entries_[0].updated,
+    ),
+    entries: entries_,
+  };
+
+  return {
+    root: await renderToDOM(AtomPage({ feed: feed })),
+    renderer: "xml",
+    destFilePath: feedPath,
+    href: feedPath,
+  };
+}