feat(lib): create function to generate atom feed

src/app/(blog)/feed/generate-feed.ts

@@ -0,0 +1,51 @@
+import { getSortedPosts } from '@/shared/lib/get-sorted-posts'
+import { host } from '@/shared/lib/webserver-constants'
+import { allPosts } from 'contentlayer/generated'
+import { Feed } from 'feed'
+import { markdownToHtml } from './markdown-to-html'
+
+export function generateFeed() {
+  const date = new Date()
+
+  const posts = getSortedPosts(allPosts).filter(
+    post => post.status === 'published'
+  )
+
+  const feed = new Feed({
+    title: "Mateus Felipe's interests",
+    description:
+      'This is my "corner of internet", where I take some tests, document my studies and write about some subjects I like...',
+    id: host,
+    link: host,
+    favicon: `${host}/assets/brain.png`,
+    copyright: `All rights reserved ${date.getFullYear()}, Mateus Felipe.`,
+    updated: posts.length > 0 ? new Date(posts[0].date) : date,
+    feedLinks: {
+      rss2: `${host}/feed`
+    },
+    docs: 'https://github.com/mateusfg7/mfg-b',
+    generator: 'Feed for Node.js',
+    author: {
+      name: 'Mateus Felipe Gonçalves',
+      email: '[email protected]',
+      link: 'https://mateusf.vercel.app'
+    }
+  })
+
+  posts.forEach(post => {
+    const { name, email, url } = post.author_info
+
+    feed.addItem({
+      title: post.title,
+      id: post.id,
+      link: `${host}/post/${post.id}`,
+      description: post.description,
+      content: markdownToHtml(post.body.raw),
+      author: [{ name, email, link: url }],
+      date: new Date(post.date),
+      category: post.tags.split(',').map(tag => ({ name: tag.trim() }))
+    })
+  })
+
+  return feed.atom1()
+}