single-page-markdown-website/lib/utilities/build-html-async/create-markdown-toc-async.js

Create a nice single-page documentation website from one or more Markdown files

import { toc } from 'mdast-util-toc';
import remarkParse from 'remark-parse';
import remarkStringify from 'remark-stringify';
import remarkStripBadges from 'remark-strip-badges';
import { unified } from 'unified';
export async function createMarkdownTocAsync(content, options) {
    const file = await unified()
        .use(remarkParse)
        .use(remarkStripBadges)
        .use(remarkExtractToc, { sections: options.sections })
        .use(remarkStringify)
        .process(content);
    const result = file.toString();
    return result === '' ? null : result;
}
const remarkExtractToc = function (options) {
    return function (node) {
        const { map } = toc(node, {
            tight: true
        });
        if (map === null) {
            node.children = [];
            delete node.position;
            return;
        }
        if (options.sections === false) {
            node.children = [map];
            delete node.position;
            return;
        }
        if (map.children.length > 1) {
            const { map } = toc(node, {
                maxDepth: 1,
                tight: true
            });
            if (map === null) {
                node.children = [];
                delete node.position;
                return;
            }
            node.children = [map];
            delete node.position;
            return;
        }
        const result = [];
        for (const node of map.children[0].children) {
            if (node.type === 'list') {
                for (const child of node.children) {
                    result.push({
                        children: [child.children[0]],
                        spread: false,
                        type: 'listItem'
                    });
                }
            }
        }
        node.children = [
            {
                children: result,
                ordered: false,
                spread: false,
                type: 'list'
            }
        ];
        delete node.position;
    };
};
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