40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
const GithubSlugger = require('github-slugger');
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function markdownItHeaderAnchors(md) {
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let slugger = new GithubSlugger();
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let defaultRender =
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md.renderer.rules.heading_open ||
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((tokens, idx, options, _env, self) =>
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self.renderToken(tokens, idx, options));
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// eslint-disable-next-line camelcase
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md.renderer.rules.heading_open = (tokens, idx, opts, env, self) => {
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let renderedHeadingOpen = defaultRender(tokens, idx, opts, env, self);
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let innerText = '';
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let headingContentToken = tokens[idx + 1];
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headingContentToken.children.forEach(child => {
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switch (child.type) {
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case 'html_block':
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case 'html_inline':
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break;
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case 'emoji':
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innerText += child.markup;
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break;
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default:
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innerText += child.content;
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}
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});
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if (innerText.length > 0) {
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let id = slugger.slug(innerText);
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renderedHeadingOpen += `<a id="${id}" class="anchor" href="#${id}" aria-hidden="true"><span class="octicon octicon-link"></span></a>`;
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}
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return renderedHeadingOpen;
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};
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}
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module.exports = markdownItHeaderAnchors;
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