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/*
* SonarQube
* Copyright (C) 2009-2019 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
import slug from 'remark-slug';
import util from 'mdast-util-toc';
/**
* This is a simplified version of the remark-toc plugin: https://github.com/remarkjs/remark-toc
* It *only* renders the TOC, and leaves all the rest out.
*/
export default function onlyToc() {
this.use(slug);
return transformer;
function transformer(node) {
const result = util(node, { heading: 'doctoc', maxDepth: 2 });
if (result.index === null || result.index === -1 || !result.map) {
node.children = [];
} else {
node.children = [result.map];
}
}
}
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