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import Markdoc, { type RenderableTreeNode, type Schema } from '@markdoc/markdoc';
import { getTextContent } from '../runtime.js';
import Slugger from 'github-slugger';
export const headingSlugger = new Slugger();
function getSlug(attributes: Record<string, any>, children: RenderableTreeNode[]): string {
if (attributes.id && typeof attributes.id === 'string') {
return attributes.id;
}
const textContent = attributes.content ?? getTextContent(children);
let slug = headingSlugger.slug(textContent);
if (slug.endsWith('-')) slug = slug.slice(0, -1);
return slug;
}
export const heading: Schema = {
children: ['inline'],
attributes: {
id: { type: String },
level: { type: Number, required: true, default: 1 },
},
transform(node, config) {
const { level, ...attributes } = node.transformAttributes(config);
const children = node.transformChildren(config);
const slug = getSlug(attributes, children);
const render = config.nodes?.heading?.render ?? `h${level}`;
const tagProps =
// For components, pass down `level` as a prop,
// alongside `__collectHeading` for our `headings` collector.
// Avoid accidentally rendering `level` as an HTML attribute otherwise!
typeof render === 'function'
? { ...attributes, id: slug, __collectHeading: true, level }
: { ...attributes, id: slug };
return new Markdoc.Tag(render, tagProps, children);
},
};
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