react syntax highlighter + clipboard

1. 先去讀 postsDirectory 的markdownfile交給matter將markdown轉成object

---
title: Hello
slug: home
---
# Hello world!
md

結果

{
  content: '# Hello world!',
  data: { 
    title: 'Hello', 
    slug: 'home' 
  }
}
js

const fullPath = path.join(postsDirectory, `${id}.md`);
const fileContents = fs.readFileSync(fullPath, 'utf8');
const matterResult = matter(fileContents);
...
js

2. 將matterResult的markdown語法顯示出來 註：remarkGfm 讓他可以接受github的神奇markdown語法

import remarkGfm from 'remark-gfm'
import ReactMarkdown from "react-markdown";
...
<ReactMarkdown components={components} remarkPlugins={[remarkGfm]}>
    {postData.contentHtml}
</ReactMarkdown>
jsx

3. 讓產生出來的程式需要有顏色的語法提示及複製功能 註：這裡是透過指定ReactMarkdown的components及使用chakra ui的useClipboard hook，如果codeblock有指定的程式語言就使用react-syntax-highlighter將他顯示語法提示

import { Container, Heading, Link, Code, useClipboard, Flex, Button } from "@chakra-ui/react";
import { PrismAsync as SyntaxHighlighter } from "react-syntax-highlighter";


function CodeBlock({ node, inline, className, children, ...props }: any)  {
  const { onCopy, value, setValue, hasCopied } = useClipboard(children);
  const match = /language-(\w+)/.exec(className || '');
  return !inline && match ? (
    <Flex mb={2}>
      <SyntaxHighlighter
        style={darcula as { [key: string]: CSSProperties }}
        language={match[1]}
        PreTag="div"
        {...props}
      >
        {String(children).replace(/\n$/, '')}
      </SyntaxHighlighter>
      <Button ml={2} onClick={onCopy}colorScheme='blue' variant='outline'>{hasCopied ? "Copied!" : "Copy"}</Button>
    </Flex>
  ) : (
    <Flex mb={2}>
      <Code {...props} colorScheme="blackAlpha">
        {children}
      </Code>
      <Button ml={2} onClick={onCopy} colorScheme='blue' variant='outline'>{hasCopied ? "Copied!" : "Copy"}</Button>
    </Flex>
  );
}
const components = {
  code: CodeBlock,
};
jsx

• https://npm.io/package/gray-matter
• https://www.npmjs.com/package/react-markdown
• https://www.npmjs.com/package/remark-gfm