From b2b46a361589521d5f8ea1fca52ad41722367998 Mon Sep 17 00:00:00 2001
From: Leonardo Bishop <me@leonardobishop.com>
Date: Tue, 8 Apr 2025 03:05:49 +0100
Subject: Add basic support for atom feeds

---
 app/builder/discoverFeed.ts | 67 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 app/builder/discoverFeed.ts

(limited to 'app/builder/discoverFeed.ts')

diff --git a/app/builder/discoverFeed.ts b/app/builder/discoverFeed.ts
new file mode 100644
index 0000000..5ea1a16
--- /dev/null
+++ b/app/builder/discoverFeed.ts
@@ -0,0 +1,67 @@
+import path from "path";
+import fs from "fs";
+import { Feed, PageDirectory } from "./pageDirectory.js";
+import { logger } from "../logger.js";
+
+export async function discoverFeed(feed: Feed, pageDirectory: PageDirectory): Promise<boolean> {
+    const entries = [];
+
+    const titleConfigPath = feed.paramStrategy?.title?.from || "title";
+    const updatedConfigPath = feed.paramStrategy?.date?.from || "date";
+    const descriptionConfigPath = feed.paramStrategy?.description?.from || "description";
+    //todo support actual discovery strategies 
+
+    for (const page of pageDirectory.getPagesBeginningWith(feed.route)) {
+        if (page.name === 'index') {
+            continue;
+        }
+        const entry = {
+            title: page.config[titleConfigPath] || page.name,
+            updated: page.config[updatedConfigPath] || new Date(0),
+            id: page.name,
+            url: `${feed.url}/${page.name}`,
+            description: page.config[descriptionConfigPath] || "",
+            // description: page.html?.length > 100 ? `${page.html?.substring(0, 100)}...` || "" : page.html || "",
+        };
+        entries.push(entry);
+    }
+
+    feed.entries = entries;
+    feed.entries.sort((a, b) => b.updated.getTime() - a.updated.getTime());
+    feed.updated = new Date(0);
+    for (const entry of feed.entries) {
+        if (entry.updated > feed.updated) {
+            feed.updated = entry.updated;
+        }
+    }
+
+    const atomFeed = `<feed xmlns="http://www.w3.org/2005/Atom">
+<title>${feed.title}</title>
+<updated>${feed.updated.toISOString()}</updated>
+<link rel="self" href="${feed.url}/atom.xml" type="application/atom+xml"/>
+<link rel="alternate" href="${feed.url}" type="text/html"/>
+${feed.entries
+        .map((entry) => {
+            return `<entry>
+<title>${entry.title}</title>
+<updated>${entry.updated.toISOString()}</updated>
+<id>${entry.id}</id>
+<link rel="alternate" href="${entry.url}" type="text/html"/>
+<summary>${entry.description}</summary>
+</entry>`;
+        })
+        .join("\n")}
+</feed>`;
+
+    try {
+        const file = feed.buildPath;
+        const dir = path.dirname(file);
+        if (!fs.existsSync(dir)) {
+            fs.mkdirSync(dir, { recursive: true });
+        }
+        fs.writeFileSync(file, atomFeed);
+    } catch (e) {
+        logger.error(`Failed to write feed ${feed.buildPath}: ${e.message}`);
+        return false;
+    }
+}
\ No newline at end of file
-- 
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