Next.jsでブログをつくった

---
slug: "blog-renewal"
title: "Next.jsでブログをつくった"
date: "20220326"
tags: ["tech", "web", "nextjs"]
---

| just a | table |
| ------ | ----- |
| 1      | 2     |
| 3      | 4     |
 
<https://www.haxibami.net>
 
- [x] トゥードゥー
- [ ] リストや、脚注[^1]
 
[^1]: 脚注など

$$
( \sum_{k=1}^{n} a_k b_k )^2 \leq ( \sum_{k=1}^{n} {a_k}^2 ) ( \sum_{k=1}^{n} {b_k}^2 )
$$

$e^{i\pi} + 1 = 0$ :arrow_left: インライン数式

> 昨日午後、{†聖剣†}^(エクスカリバー)を振り回す{全裸中年男性}^(無敵の人)が出現し……

:arrow_right: [はじめに](#はじめに) に飛べるよ

```mermaid
sequenceDiagram
Alice->>John: Hello John, how are you?
loop Healthcheck
    John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
```
 
```mermaid
stateDiagram-v2
    state fork_state <<fork>>
      [*] --> fork_state
      fork_state --> State2
      fork_state --> State3
 
      state join_state <<join>>
      State2 --> join_state
      State3 --> join_state
      join_state --> State4
      State4 --> [*]
```
 
```mermaid
pie
"Dogs" : 386
"Cats" : 85
"Rats" : 15
```

import LinkCard from "components/LinkCard";
import NextImage from "components/NextImage";
import NextLink from "components/NextLink";
 
import type { LinkCardProps } from "components/LinkCard";
import type { NextImageProps } from "components/NextImage";
import type { NextLinkProps } from "components/NextLink";
import type { MDXComponents } from "mdx/types";
 
type ProvidedComponents = MDXComponents & {
  a: typeof NextLink;
  img: typeof NextImage;
  extlink: typeof LinkCard;
};
 
const replaceComponents = {
  a: (props: NextLinkProps) => <NextLink {...props} />,
  img: (props: NextImageProps) => <NextImage {...props} />,
  extlink: (props: LinkCardProps) => <LinkCard {...props} />,
} as ProvidedComponents;
 
export default replaceComponents;

import MDXComponent from "components/MDXComponent";
 
const result = compileMDX({
  source,
  components: MDXComponent,
});

import { getPlaiceholder } from "plaiceholder";
import { visit } from "unist-util-visit";
 
import type { Image } from "mdast";
import type { Plugin, Transformer } from "unified";
import type { Node } from "unist";
 
const rehypeImageOpt: Plugin<[void]> = function imageOpt(): Transformer {
  return async (tree: Node) => {
    const promises: (() => Promise<void>)[] = [];
    visit(tree, "image", (node: Image) => {
      const src = node.url;
 
      promises.push(async () => {
        const blur = await getPlaiceholder(src);
        node.data = {
          hProperties: {
            src: blur.img.src,
            width: blur.img.width,
            height: blur.img.height,
            aspectRatio: `${blur.img.width} / ${blur.img.height}`,
            blurDataURL: blur.base64,
          },
        };
      });
    });
    await Promise.allSettled(promises.map((t) => t()));
  };
};
 
export default rehypeImageOpt;

import fs from "fs";
 
import { Feed } from "feed";
 
import { dateConverter } from "./lib/build.js";
import { SITEDATA } from "./lib/constant.js";
import { getPostsData } from "./lib/fs.js";
 
// variables
const HOST = "https://www.haxibami.net";
 
// generate feed
const feedGenerator = async () => {
  const author = {
    name: "haxibami",
    email: "[email protected]",
    link: HOST,
  };
 
  const date = new Date();
  const feed = new Feed({
    title: SITEDATA.blog.title,
    description: SITEDATA.blog.description,
    id: HOST,
    link: HOST,
    language: "ja",
    image: `${HOST}/kripcat.jpg`,
    favicon: `${HOST}/favicon.ico`,
    copyright: `All rights reserved ${date.getFullYear()}, ${author.name}`,
    updated: date,
    feedLinks: {
      rss2: `${HOST}/rss/feed.xml`,
      json: `${HOST}/rss/feed.json`,
      atom: `${HOST}/rss/atom.xml`,
    },
    author: author,
  });
 
  const blogs = await getPostsData("articles/blog");
 
  blogs.forEach((post) => {
    const url = `${HOST}/blog/posts/${post.data?.slug}`;
    feed.addItem({
      title: `${post.data?.title}`,
      description: `${post.preview}`,
      id: url,
      link: url,
      guid: url,
      date: new Date(dateConverter(post.data?.date)),
      category: post.data?.tags
        ? post.data?.tags.map((tag) => ({
            name: tag,
          }))
        : [],
      enclosure: {
        url: encodeURI(
          `${HOST}/api/ogp?title=${post.data?.title}&date=${post.data?.date}.png`,
        ),
        length: 0,
        type: "image/png",
      },
    });
  });
 
  fs.mkdirSync("public/rss", { recursive: true });
  await Promise.all([
    fs.promises.writeFile(
      "public/rss/feed.xml",
      feed.rss2().replace(/&/g, "&"),
    ),
    fs.promises.writeFile("public/rss/atom.xml", feed.atom1()),
    fs.promises.writeFile("public/rss/feed.json", feed.json1()),
  ]);
};
 
const GenFeed = () => {
  return new Promise<void>((resolve) => {
    feedGenerator();
    resolve();
  });
};
 
export default GenFeed;