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src/utils/post.ts

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+import type { CollectionEntry } from 'astro:content'
+import { getCollection } from 'astro:content'
+
+/** Note: this function filters out draft posts based on the environment */
+export async function getAllPosts() {
+	return await getCollection('post', ({ data }) => {
+		return import.meta.env.PROD ? data.draft !== true : true
+	})
+}
+
+export function sortMDByDate(posts: Array<CollectionEntry<'post'>>) {
+	return posts.sort((a, b) => {
+		const aDate = new Date(a.data.updatedDate ?? a.data.publishDate).valueOf()
+		const bDate = new Date(b.data.updatedDate ?? b.data.publishDate).valueOf()
+		return bDate - aDate
+	})
+}
+
+/** Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so. */
+export function getAllTags(posts: Array<CollectionEntry<'post'>>) {
+	return posts.flatMap((post) => [...post.data.tags])
+}
+
+/** Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so. */
+export function getUniqueTags(posts: Array<CollectionEntry<'post'>>) {
+	return [...new Set(getAllTags(posts))]
+}
+
+/** Note: This function doesn't filter draft posts, pass it the result of getAllPosts above to do so. */
+export function getUniqueTagsWithCount(
+	posts: Array<CollectionEntry<'post'>>
+): Array<[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])
+}