Add helper functions for news

lib/news.ts

@@ -0,0 +1,64 @@
+import fs from "fs/promises";
+import path from "path";
+
+import matter from "gray-matter";
+import { MDXRemoteSerializeResult } from "next-mdx-remote";
+import { serialize } from "next-mdx-remote/serialize";
+
+const NEWS_PATH = path.join("content", "news");
+
+interface Metadata {
+  author: string;
+  date: string;
+}
+
+export interface News {
+  content: MDXRemoteSerializeResult<Record<string, unknown>>;
+  metadata: Metadata;
+}
+
+export async function getNewsYears(): Promise<string[]> {
+  return (await fs.readdir(NEWS_PATH, { withFileTypes: true }))
+    .filter((dirent) => dirent.isDirectory())
+    .map((dirent) => dirent.name);
+}
+
+export async function getNewsTermsByYear(year: string): Promise<string[]> {
+  return (
+    await fs.readdir(path.join(NEWS_PATH, year), {
+      withFileTypes: true,
+    })
+  )
+    .filter((dirent) => dirent.isDirectory())
+    .map((dirent) => dirent.name);
+}
+
+export async function getNewsByTerm(
+  year: string,
+  term: string
+): Promise<string[]> {
+  return (
+    await fs.readdir(path.join(NEWS_PATH, year, term), {
+      withFileTypes: true,
+    })
+  )
+    .filter((dirent) => dirent.isFile() && dirent.name.endsWith(".md"))
+    .map((dirent) => dirent.name.slice(0, -".md".length));
+}
+
+export async function getNewsBySlug(
+  year: string,
+  term: string,
+  slug: string
+): Promise<News> {
+  const raw = await fs.readFile(
+    path.join(NEWS_PATH, year, term, `${slug}.md`),
+    "utf-8"
+  );
+  const { content, data: metadata } = matter(raw);
+
+  return {
+    content: await serialize(content),
+    metadata: metadata as Metadata,
+  };
+}

types.d.ts

@@ -1,3 +1,6 @@
+/* eslint-disable import/order */
+/* eslint-disable import/no-duplicates */
+
 declare module "*.event.mdx" {
   import { ComponentType } from "react";