feat(feed): add site feed generation plugin for rss subscription support

docs/.vitepress/plugins/genFeed.ts

@@ -0,0 +1,56 @@
+import path from 'node:path'
+import { writeFileSync } from 'node:fs'
+import { Feed } from 'feed'
+import { type SiteConfig, createContentLoader } from 'vitepress'
+import { site as baseUrl, description, name } from '../config/meta'
+
+function reName(name: string) {
+    if (!name) name = 'Anda Toshiki'
+    return name === 'Anda Toshiki' ? 'andatoshiki' : name
+}
+
+function getGithubLink(name: string) {
+    return `https://github.com/${reName(name)}`
+}
+
+export async function genFeed(config: SiteConfig) {
+    const feed = new Feed({
+        title: name,
+        description,
+        id: baseUrl,
+        link: baseUrl,
+        language: 'en-US',
+        image: 'https://note.toshiki.dev/logo-308px.png',
+        favicon: `${baseUrl}/favicon.ico`,
+        copyright: 'Copyright (c) 2023-present, Anda Toshiki at Toshiki Dev',
+    })
+
+    const posts = await createContentLoader('**/*.md', {
+        excerpt: true,
+        render: true,
+    }).load()
+
+    posts.sort((a, b) => +new Date(b.frontmatter?.date as string) - +new Date(a.frontmatter?.date as string))
+
+    for (const { url, frontmatter, html } of posts) {
+        let postTitle = 'No Title'
+        postTitle = html?.match(/<h1 id=(.*)>(.*?)<a .*?>/)?.[2] || postTitle
+        feed.addItem({
+            title: frontmatter?.title || postTitle,
+            id: `${baseUrl}${url.slice(1)}`,
+            link: `${baseUrl}${url.slice(1)}`,
+            guid: `${baseUrl}${url.slice(1)}`,
+            description: html,
+            content: html,
+            author: [
+                {
+                    name: frontmatter?.author || 'Anda Toshiki',
+                    link: frontmatter?.author ? getGithubLink(frontmatter?.author) : undefined,
+                },
+            ],
+            date: frontmatter?.date || new Date('2021-07-01'),
+        })
+    }
+
+    writeFileSync(path.join(config.outDir, 'feed.xml'), feed.rss2())
+}