fix tag pages

src/utils/tags.ts

@@ -0,0 +1,40 @@
+import { getCollection } from 'astro:content';
+
+export function getSlug(input: string): string {
+	return input
+		.toLowerCase()
+		.replace(/[^\w\s-]/g, '')
+		.replace(/[\s_]+/g, '-')
+		.replace(/^-+|-+$/g, '');
+}
+
+export interface Tag {
+	value: string;
+	slug: string;
+}
+
+export async function getTags(): Promise<Tag[]> {
+	const posts = await getCollection('blog');
+
+	const tags: Tag[] = [
+		{
+			value: 'All',
+			slug: 'all',
+		},
+	];
+
+	posts.forEach((post) => {
+		post.data.tags.forEach((tag) => {
+			const tagToAdd = {
+				value: tag,
+				slug: getSlug(tag),
+			};
+
+			if (!tags.includes(tagToAdd)) {
+				tags.push(tagToAdd);
+			}
+		});
+	});
+
+	return tags;
+}