feat: RSS feed

post-build.ts

@@ -1,5 +1,6 @@
 import fs from 'fs'
 import process from 'process'
+import { Feed } from 'feed'
 
 process.loadEnvFile()
 
@@ -28,6 +29,10 @@ function readArticleMetadata(path: string): Record<string, string> | null {
   const metadata: Record<string, string> = {
     path: path.replaceAll('/index.md', ''),
   }
+  const dateMatch = path.match(/(\d{4}\/\d{2}\/\d{2})/)
+  if (dateMatch && dateMatch[1]) {
+    metadata['date'] = dateMatch[1].replaceAll('/', '-')
+  }
   do {
     subMatch = METADATA_REGEX.exec(match[1])
     if (subMatch && subMatch[1] && subMatch[2]) {
@@ -69,6 +74,18 @@ function formatArticlePage(metadata: Record<string, string>, baseHtml: string):
   return outHtml
 }
 
+function addFeedArticle(metadata: Record<string, string>, feed: Feed) {
+  if (metadata.draft !== 'true') {
+    feed.addItem({
+      title: metadata.title.replace(/(<([^>]+)>)/gi, '').trim(),
+      id: metadata.path,
+      link: `${process.env.VITE_BASE_URL}${metadata.path}/`,
+      date: new Date(Date.parse(metadata.date)),
+      image: metadata.thumbnail.replace('./', process.env.VITE_BASE_URL + metadata.path + '/'),
+    })
+  }
+}
+
 const indexContent = fs.readFileSync('dist/index.html', { encoding: 'utf8' })
 
 if (!indexContent) {
@@ -76,15 +93,39 @@ if (!indexContent) {
   process.exit(1)
 }
 
-getFiles('articles')
-  .filter((path) => path.match(/index.md$/))
-  .forEach((path) => {
-    const metadata = readArticleMetadata(path)
-    if (metadata) {
-      fs.writeFileSync(
-        `dist/${metadata.path}/index.html`,
-        formatArticlePage(metadata, indexContent),
-      )
-      console.info(`Wrote dist/${metadata.path}/index.html`)
-    }
-  })
+const metadatas = getFiles('articles')
+  .filter((path) => path.match(/\d{4}\/\d{2}\/\d{2}\/index.md$/))
+  .map((path) => readArticleMetadata(path))
+  .filter((metadata) => !!metadata)
+
+const feed = new Feed({
+  title: process.env.VITE_APP_TITLE?.replace(/(<([^>]+)>)/gi, '').trim() ?? '',
+  id: process.env.VITE_BASE_URL,
+  link: process.env.VITE_BASE_URL,
+  language: process.env.VITE_APP_LANG,
+  favicon: process.env.VITE_BASE_URL + '/articles/favicon.ico',
+  generator: 'md-blog',
+  feedLinks: {
+    json: process.env.VITE_BASE_URL + 'feed.json',
+    atom: process.env.VITE_BASE_URL + 'atom.xml',
+    rss: process.env.VITE_BASE_URL + 'rss',
+  },
+  updated: new Date(
+    Math.max(
+      0,
+      ...metadatas
+        .filter((metadata) => metadata.draft !== 'true')
+        .map((metadata) => Date.parse(metadata.date)),
+    ),
+  ),
+})
+
+metadatas.forEach((metadata) => {
+  fs.writeFileSync(`dist/${metadata.path}/index.html`, formatArticlePage(metadata, indexContent))
+  console.info(`Wrote dist/${metadata.path}/index.html`)
+  addFeedArticle(metadata, feed)
+})
+
+fs.writeFileSync('dist/feed.json', feed.json1())
+fs.writeFileSync('dist/atom.xml', feed.atom1())
+fs.writeFileSync('dist/rss', feed.rss2())