Initial commit

src/data/post.ts

@@ -0,0 +1,48 @@
+import { type CollectionEntry, getCollection } from "astro:content";
+
+/** filter out draft posts based on the environment */
+export async function getAllPosts(): Promise<CollectionEntry<"post">[]> {
+	return await getCollection("post", ({ data }) => {
+		return import.meta.env.PROD ? !data.draft : true;
+	});
+}
+
+/** groups posts by year (based on option siteConfig.sortPostsByUpdatedDate), using the year as the key
+ *  Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so.
+ */
+export function groupPostsByYear(posts: CollectionEntry<"post">[]) {
+	return posts.reduce<Record<string, CollectionEntry<"post">[]>>((acc, post) => {
+		const year = post.data.publishDate.getFullYear();
+		if (!acc[year]) {
+			acc[year] = [];
+		}
+		acc[year]?.push(post);
+		return acc;
+	}, {});
+}
+
+/** returns all tags created from posts (inc duplicate tags)
+ *  Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so.
+ *  */
+export function getAllTags(posts: CollectionEntry<"post">[]) {
+	return posts.flatMap((post) => [...post.data.tags]);
+}
+
+/** returns all unique tags created from posts
+ *  Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so.
+ *  */
+export function getUniqueTags(posts: CollectionEntry<"post">[]) {
+	return [...new Set(getAllTags(posts))];
+}
+
+/** returns a count of each unique tag - [[tagName, count], ...]
+ *  Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so.
+ *  */
+export function getUniqueTagsWithCount(posts: CollectionEntry<"post">[]): [string, number][] {
+	return [
+		...getAllTags(posts).reduce(
+			(acc, t) => acc.set(t, (acc.get(t) ?? 0) + 1),
+			new Map<string, number>(),
+		),
+	].sort((a, b) => b[1] - a[1]);
+}