50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
const has = require('hast-util-has-property');
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const is = require('hast-util-is-element');
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const slug = require('rehype-slug');
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const visit = require('unist-util-visit');
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/**
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* Get remark to add IDs to headings and inject anchors into them.
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* This is a stripped-down equivalent of [rehype-autolink-headings](https://github.com/wooorm/rehype-autolink-headings)
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* that supports ignoring headings with the `no-anchor` class.
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*/
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const HEADINGS = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
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const NO_ANCHOR_CLASS = 'no-anchor';
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const clone = obj => JSON.parse(JSON.stringify(obj));
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const hasClass = (node, cls) => {
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const className = node.properties.className;
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return className && className.includes(cls);
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};
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const link = options =>
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tree => visit(tree, node => {
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if (is(node, HEADINGS) && has(node, 'id') && !hasClass(node, NO_ANCHOR_CLASS)) {
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node.children.push({
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type: 'element',
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tagName: 'a',
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properties: Object.assign(clone(options.properties), {href: `#${node.properties.id}`}),
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children: clone(options.content)
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});
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}
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});
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module.exports = [
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slug,
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[link, {
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properties: {
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title: 'Link to this heading',
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className: ['header-link'],
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'aria-hidden': 'true'
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},
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content: [
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{
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type: 'element',
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tagName: 'i',
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properties: {className: ['material-icons']},
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children: [{ type: 'text', value: 'link' }]
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}
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]
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}]
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];
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