Drive archive posts from content

src/lib/content-routes.ts

@@ -0,0 +1,42 @@
+import { getCollection } from "astro:content";
+
+const blogSourcePattern = /^\/blog\/(?<year>\d{4})\/(?<month>\d{2})\/(?<day>\d{2})\/(?<slug>[^/]+)\.html$/;
+
+export type BlogSourceRoute = {
+  year: string;
+  month: string;
+  day: string;
+  slug: string;
+  route: string;
+};
+
+export function parseBlogSource(source?: string): BlogSourceRoute | undefined {
+  if (!source) {
+    return undefined;
+  }
+
+  const match = blogSourcePattern.exec(source);
+  if (!match?.groups) {
+    return undefined;
+  }
+
+  const { year, month, day, slug } = match.groups;
+
+  return {
+    year,
+    month,
+    day,
+    slug,
+    route: `blog/${year}/${month}/${day}/${slug}.html`,
+  };
+}
+
+export async function contentSourceRoutes(): Promise<Set<string>> {
+  const entries = await getCollection("archive");
+
+  return new Set(
+    entries
+      .map((entry) => parseBlogSource(entry.data.source)?.route)
+      .filter((route): route is string => Boolean(route)),
+  );
+}