feat: extracts some repeated logic out into lib/ files

www/src/lib/posts.ts

@@ -0,0 +1,35 @@
+import type { CollectionEntry } from 'astro:content';
+
+type Post = CollectionEntry<'md'>;
+
+export function sortPosts(posts: Post[]): Post[] {
+  return posts.slice().sort((a, b) => {
+    if (a.data.pinned && !b.data.pinned) return -1;
+    if (!a.data.pinned && b.data.pinned) return 1;
+    return b.data.date.getTime() - a.data.date.getTime();
+  });
+}
+
+export function organizePostsByCategory(posts: Post[]): {
+  grouped: Record<string, Post[]>;
+  categories: string[];
+} {
+  const grouped = posts.reduce((acc, post) => {
+    const category = post.data.category ?? 'md';
+    if (!acc[category]) acc[category] = [];
+    acc[category].push(post);
+    return acc;
+  }, {} as Record<string, Post[]>);
+
+  const categories = Object.keys(grouped).sort((a, b) => {
+    if (a === 'md') return -1;
+    if (b === 'md') return 1;
+    return a.localeCompare(b);
+  });
+
+  for (const category of categories) {
+    grouped[category] = sortPosts(grouped[category]);
+  }
+
+  return { grouped, categories };
+}