94 lines
2.6 KiB
Markdown
94 lines
2.6 KiB
Markdown
# marked-highlight
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Highlight code blocks
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## Installation
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```sh
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npm install marked-highlight
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```
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## Usage
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You will need to provide a function that transforms the `code` to html.
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```js
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import { Marked } from "marked";
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import { markedHighlight } from "marked-highlight";
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import hljs from 'highlight.js';
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// or UMD script
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// <script src="https://cdn.jsdelivr.net/npm/marked/lib/marked.umd.js"></script>
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// <script src="https://cdn.jsdelivr.net/npm/marked-highlight/lib/index.umd.js"></script>
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// const { Marked } = globalThis.marked;
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// const { markedHighlight } = globalThis.markedHighlight;
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const marked = new Marked(
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markedHighlight({
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emptyLangClass: 'hljs',
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langPrefix: 'hljs language-',
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highlight(code, lang, info) {
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const language = hljs.getLanguage(lang) ? lang : 'plaintext';
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return hljs.highlight(code, { language }).value;
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}
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})
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);
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marked.parse(`
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\`\`\`javascript
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const highlight = "code";
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\`\`\`
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`);
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// <pre><code class="hljs language-javascript">
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// <span class="hljs-keyword">const</span> highlight = <span class="hljs-string">"code"</span>;
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// </code></pre>
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```
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The `async` option should be set to `true` if the `highlight` function returns a `Promise`.
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```js
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import { Marked } from "marked";
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import { markedHighlight } from "marked-highlight";
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import pygmentize from 'pygmentize-bundled';
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const marked = new Marked(
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markedHighlight({
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async: true,
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highlight(code, lang, info) {
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return new Promise((resolve, reject) => {
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pygmentize({ lang, format: 'html' }, code, function (err, result) {
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if (err) {
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reject(err);
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return;
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}
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resolve(result.toString());
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});
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});
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}
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})
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)
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await marked.parse(`
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\`\`\`javascript
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const highlight = "code";
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\`\`\`
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`);
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// <pre><code class="language-javascript">
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// <div class="highlight">
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// <pre>
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// <span class="kr">const</span> <span class="nx">highlight</span> <span class="o">=</span> <span class="s2">"code"</span><span class="p">;</span>
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// </pre>
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// </div>
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// </code></pre>
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```
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### `options`
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| option | type | default | description |
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|--------|--------|---------|:------------|
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| async | boolean | `false` | If the highlight function returns a promise set this to `true`. Don't forget to `await` the call to `marked.parse` |
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| langPrefix | string | `'language-'` | A prefix to add to the class of the `code` tag. |
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| emptyLangClass | string | `''` | The class to add to the `code` tag if the language is empty. |
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| highlight | function | `(code: string, lang: string) => {}` | Required. The function to transform the code to html. |
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