代码高亮
Velite 不内置代码高亮功能,因为并非所有内容都包含代码,而且语法高亮通常需要自定义样式。但您可以使用构建时插件或客户端高亮库轻松实现。
TIP
推荐使用构建时代码高亮方案,因为这种方式更快更稳定。
@shikijs/rehype
shiki 是一款为代码块设计的精美语法高亮器。
sh
$ npm install @shikijs/rehype shikish
$ pnpm add @shikijs/rehype shikish
$ yarn add @shikijs/rehype shiki在 velite.config.ts 中配置:
ts
import rehypeShiki from '@shikijs/rehype'
import { defineConfig } from 'velite'
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [
[
rehypeShiki as any, // eslint-disable-line @typescript-eslint/no-explicit-any
{ theme: 'one-dark-pro' }
]
]
}
})Transformers(转换器)
Shiki 提供了 transformers 选项来自定义语法高亮的输出。您可以使用它来添加行高亮、行号等功能。
sh
$ npm install @shikijs/transformerssh
$ pnpm add @shikijs/transformerssh
$ yarn add @shikijs/transformersts
import rehypeShiki from '@shikijs/rehype'
import { transformerNotationDiff, transformerNotationErrorLevel, transformerNotationFocus, transformerNotationHighlight } from '@shikijs/transformers'
import { defineConfig } from 'velite'
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [
[
rehypeShiki as any, // eslint-disable-line @typescript-eslint/no-explicit-any
{
transformers: [
transformerNotationDiff({ matchAlgorithm: 'v3' }),
transformerNotationHighlight({ matchAlgorithm: 'v3' }),
transformerNotationFocus({ matchAlgorithm: 'v3' }),
transformerNotationErrorLevel({ matchAlgorithm: 'v3' })
]
}
]
]
}
})复制按钮
Shiki 默认不提供复制按钮,但您可以通过构建时插件添加。
ts
import rehypeShiki from '@shikijs/rehype'
import { defineConfig } from 'velite'
const transformerCopyButton = (): ShikiTransformer => ({
name: 'copy-button',
pre(node) {
node.children.push({
type: 'element',
tagName: 'button',
properties: {
type: 'button',
className: 'copy',
title: 'Copy to clipboard',
onclick: `
navigator.clipboard.writeText(this.previousSibling.textContent),
this.className='copied',
this.title='Copied!',
setTimeout(()=>this.className='copy',5000)`.replace(/\s+/g, '')
},
children: [
{
type: 'element',
tagName: 'svg',
properties: {
viewBox: '0 0 24 24',
fill: 'none',
stroke: 'currentColor',
strokeWidth: '1.5',
strokeLinecap: 'round',
strokeLinejoin: 'round'
},
children: [
{
type: 'element',
tagName: 'rect',
properties: {
width: '8',
height: '4',
x: '8',
y: '2',
rx: '1',
ry: '1'
},
children: []
},
{
type: 'element',
tagName: 'path',
properties: {
d: 'M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2'
},
children: []
},
{
type: 'element',
tagName: 'path',
properties: {
class: 'check',
d: 'm9 14 2 2 4-4'
},
children: []
}
]
}
]
})
}
})
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [
[
rehypeShiki as any, // eslint-disable-line @typescript-eslint/no-explicit-any
{
transformers: [transformerCopyButton()]
}
]
]
}
})css
pre.shiki {
@apply max-h-(--max-height,80svh) relative flex flex-col overflow-hidden p-0;
code {
@apply grid overflow-auto py-5;
}
.line {
@apply relative px-5;
}
button {
@apply hover:opacity-100! absolute right-3 top-3 flex cursor-pointer select-none items-center justify-center rounded-md bg-slate-600 text-sm font-medium text-white opacity-0 shadow outline-0 transition;
svg {
@apply m-2 size-5;
}
.check {
@apply opacity-0 transition-opacity;
}
&.copied {
@apply opacity-100!;
&::before {
@apply border-r border-[#0002] p-2 px-2.5 content-['Copied!'];
}
.check {
@apply opacity-100;
}
}
}
&:hover {
button {
@apply opacity-80;
}
}
}如需更多实用转换器,请参阅 shiki 转换器文档。
rehype-pretty-code
rehype-pretty-code 是一个用于格式化代码块的 rehype 插件。
sh
$ npm install rehype-pretty-code shikish
$ pnpm add rehype-pretty-code shikish
$ yarn add rehype-pretty-code shiki在 velite.config.js 中配置:
js
import rehypePrettyCode from 'rehype-pretty-code'
import { defineConfig } from 'velite'
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [rehypePrettyCode]
}
})rehype-pretty-code 会为语法高亮创建适当的 HTML 结构,您随后可以按需添加样式。以下是一个样式表示例:
css
[data-rehype-pretty-code-figure] pre {
@apply px-0;
}
[data-rehype-pretty-code-figure] code {
@apply text-sm !leading-loose md:text-base;
}
[data-rehype-pretty-code-figure] code[data-line-numbers] {
counter-reset: line;
}
[data-rehype-pretty-code-figure] code[data-line-numbers] > [data-line]::before {
counter-increment: line;
content: counter(line);
@apply mr-4 inline-block w-4 text-right text-gray-500;
}
[data-rehype-pretty-code-figure] [data-line] {
@apply border-l-2 border-l-transparent px-3;
}
[data-rehype-pretty-code-figure] [data-highlighted-line] {
background: rgba(200, 200, 255, 0.1);
@apply border-l-blue-400;
}
[data-rehype-pretty-code-figure] [data-highlighted-chars] {
@apply rounded bg-zinc-600/50;
box-shadow: 0 0 0 4px rgb(82 82 91 / 0.5);
}
[data-rehype-pretty-code-figure] [data-chars-id] {
@apply border-b-2 p-1 shadow-none;
}更多细节请参考示例。
@shikijs/rehype
sh
$ npm install @shikijs/rehypesh
$ pnpm add @shikijs/rehypesh
$ yarn add @shikijs/rehype在 velite.config.js 中配置:
js
import rehypeShiki from '@shikijs/rehype'
import { defineConfig } from 'velite'
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [[rehypeShiki, { theme: 'nord' }]]
}
})TIP
Velite 打包了大多数类型的第三方模块,这会导致 @shikijs/rehype 的类型声明不兼容,但您可以放心使用
在 velite.config.ts 中:
js
import rehypeShiki from '@shikijs/rehype'
import { defineConfig } from 'velite'
markdown: {// 如果使用 mdx 则改为 `mdx`
export default defineConfig({
rehypePlugins: [[rehypeShiki as any, { theme: 'nord' }]]
}
})rehype-highlight
使用 lowlight 为代码提供语法高亮。
sh
$ npm install rehype-highlightsh
$ pnpm add rehype-highlightsh
$ yarn add rehype-highlight在 velite.config.js 中配置:
js
import rehypeHighlight from 'rehype-highlight'
import { defineConfig } from 'velite'
export default defineConfig({
// 如果使用 mdx 则改为 `mdx`
markdown: {
rehypePlugins: [rehypeHighlight]
}
})客户端方案
您可以使用 prismjs 或 shiki 在客户端高亮代码。客户端高亮不会给 Velite 增加构建开销。
例如:
js
import { codeToHtml } from 'https://esm.sh/shikiji'
Array.from(document.querySelectorAll('pre code[class*="language-"]')).map(async block => {
block.parentElement.outerHTML = await codeToHtml(block.textContent, { lang: block.className.slice(9), theme: 'nord' })
})TIP
如果您有大量需要语法高亮的文档,推荐使用客户端方案。因为语法高亮和解析可能非常耗时,会极大影响 Velite 的构建速度。