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博客功能

代码高亮​

相关文章​

Fuse.js - https://www.fusejs.io

npm install fuse.js
import Fuse from 'fuse.js'

const articles = [
  {
    "title": "Old Man's War",
    "author": {
      "firstName": "John",
      "lastName": "Scalzi"
    }
  },
  {
    "title": "The Lock Artist",
    "author": {
      "firstName": "Steve",
      "lastName": "Hamilton"
    }
  }
  /*...*/
]

const options = { keys: ['title', 'author.firstName'] }

// Create the Fuse index
const myIndex = Fuse.createIndex(options.keys, articles)
// initialize Fuse with the index
const fuse = new Fuse(articles, options, myIndex)

阅读时间​

通过 reading-time 库可以为我们的文章添加阅读时间、文章字数元数据。

npm i reading-time

通过导出的 readingTime 方法计算文章的阅读时间，然后将数据写到 meta 变量中。

import readingTime from 'reading-time';

export function getPostBySlug(slug: string) {
...
  const { data, content, excerpt } = matter(fileContents, {
    excerpt: true,
  });

  const readTime = readingTime(content);
  const meta = { ...data, readingTime: readTime };
  ...
}

评论功能​

静态网站的评论实现有一种方案是借助 Github Issue 或者 Github Discussions 封装的插件形式集成进来。数据存储在第三方，同时也解决了登录授权问题。

下面是根据次方案实现的三个库：

  • giscus - 可借助组件库在 React、Vue 和 Svelte 中使用，支持多种语言
  • gitalk - 基于 Github Issue 和 Preact 开发的评论插件
  • utterances - 借助 Github issues 实现的轻量的评论组件，giscus 灵感就是来源于它

这里采用 Giscus 评论功能为例，进行讲解。先安装 @giscus/react 库

npm install @giscus/react --save

然后在项目中封装一个全局的评论组件：

import Giscus from '@giscus/react';
import { useTheme } from 'next-themes';

const GiscusComment = ({ isEnableReaction = false }) => {
  const { theme } = useTheme();

  return (
    <div className='mt-5 mb-2'>
      <Giscus
        repo='fantingsheng/repo.id'
        repoId='R_kgDOJoIh**'
        category='General'
        categoryId='DIC_kwDOJoIhfc4CW6cJ'
        mapping='pathname'
        reactionsEnabled={isEnableReaction ? '1' : '0'}
        emitMetadata='1'
        inputPosition='top'
        theme={theme === 'dark' ? 'transparent_dark' : 'light'}
        lang='en'
        loading='lazy'
      />
    </div>
  );
};

export default GiscusComment;

文章 RSS 订阅​

RSS 是网站内容常见的订阅方式，而 feed 库正是该功能的封装。

安装 feed 库​

npm i feed

获取所有的文章数据​

从博客文章的所在目录读取所有的 mdx 格式文件，然后从头部的 metadata 数据中获取到文章的相关信息。

export const getBlogPostsData = async () => {
  // path where the MDX files are
  const DIR = path.join(process.cwd(), "src", "content", "blog");
  const files = fs
    .readdirSync(DIR)
    .filter((file) => file.endsWith(".mdx"));
  const META = /export\s+const\s+meta\s+=\s+(\{(\n|.)*?\n\})/;
  const postsData = files.map((file) => {
    // grab the metadata
    const name = path.join(DIR, file);
    const contents = fs.readFileSync(name, "utf8");
    const match = META.exec(contents);
    if (!match || typeof match[1] !== "string")
      throw new Error(`${name} needs to export const meta = {}`);
    const meta = eval("(" + match[1] + ")");
    // remove the ".mdx" from the filename
    const slug = file.replace(/\.mdx?$/, "");
    return {
      ...meta,
      slug,
    };
  });
  return postsData;
};

创建 RSS 订阅文件​

import { Feed } from "feed";
import { getBlogPostsData } from "@/utils/blog";

const generateRssFeed = async () => {
  const posts = await getBlogPostsData();
  const siteURL = process.env.SITE_URL;
  const date = new Date();
  const author = {
    name: "Timfan",
    email: "fants0230@sina.com",
    link: "https://spacexcode.com/author",
  };
  const feed = new Feed({
    title: "Timfan' blog",
    description: "",
    id: siteURL,
    link: siteURL,
    image: `${siteURL}/logo.svg`,
    favicon: `${siteURL}/favicon.png`,
    copyright: `All rights reserved ${date.getFullYear()}, Timfan`,
    updated: date,
    generator: "Feed for Timfan's blog",
    feedLinks: {
      rss2: `${siteURL}/rss/feed.xml`,
      json: `${siteURL}/rss/feed.json`,
      atom: `${siteURL}/rss/atom.xml`,
    },
    author,
  });
  posts.forEach((post) => {
    const url = `${siteURL}/blog/${post.slug}`;
    feed.addItem({
      title: post.title,
      id: url,
      link: url,
      description: post.summary,
      content: post.summary,
      author: [author],
      contributor: [author],
      date: new Date(post.published_at),
    });
  });
};

最后我们将生成的订阅文件写到项目目录中

import fs from "fs";
import { Feed } from "feed";
import { getBlogPostsData } from "@/utils/blog";
const generateRssFeed = async () => {
  const posts = await getBlogPostsData();
  const siteURL = process.env.SITE_URL;
  const date = new Date();
  const author = {
    name: "Timfan",
    email: "fants0230@sina.com",
    link: "https://spacexcode.com/author",
  };
  const feed = new Feed({
    title: "Timfan' blog",
    description: "",
    id: siteURL,
    link: siteURL,
    image: `${siteURL}/logo.svg`,
    favicon: `${siteURL}/favicon.png`,
    copyright: `All rights reserved ${date.getFullYear()}, Timfan`,
    updated: date,
    generator: "Feed for Timfan's blog",
    feedLinks: {
      rss2: `${siteURL}/rss/feed.xml`,
      json: `${siteURL}/rss/feed.json`,
      atom: `${siteURL}/rss/atom.xml`,
    },
    author,
  });
  posts.forEach((post) => {
    const url = `${siteURL}/blog/${post.slug}`;
    feed.addItem({
      title: post.title,
      id: url,
      link: url,
      description: post.summary,
      content: post.summary,
      author: [author],
      contributor: [author],
      date: new Date(post.published_at),
    });
  });
  fs.mkdirSync("./public/rss", { recursive: true });
  fs.writeFileSync("./public/rss/feed.xml", feed.rss2());
  fs.writeFileSync("./public/rss/atom.xml", feed.atom1());
  fs.writeFileSync("./public/rss/feed.json", feed.json1());
};

在 getStaticProps 方法中调用​

export const getStaticProps = async (_context) => {
  await generateRssFeed();
  return {
    // ...
  };
};

详见 rss-for-nextjs - https://sreetamdas.com/blog/rss-for-nextjs

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