debian-mirror-gitlab/app/assets/javascripts/render_mermaid.js
2018-03-17 18:26:18 +05:30

57 lines
1.4 KiB
JavaScript

// Renders diagrams and flowcharts from text using Mermaid in any element with the
// `js-render-mermaid` class.
//
// Example markup:
//
// <pre class="js-render-mermaid">
// graph TD;
// A-- > B;
// A-- > C;
// B-- > D;
// C-- > D;
// </pre>
//
import Flash from './flash';
export default function renderMermaid($els) {
if (!$els.length) return;
import(/* webpackChunkName: 'mermaid' */ 'blackst0ne-mermaid').then((mermaid) => {
mermaid.initialize({
// mermaid core options
mermaid: {
startOnLoad: false,
},
// mermaidAPI options
theme: 'neutral',
});
$els.each((i, el) => {
const source = el.textContent;
// Remove any extra spans added by the backend syntax highlighting.
Object.assign(el, { textContent: source });
mermaid.init(undefined, el, (id) => {
const svg = document.getElementById(id);
svg.classList.add('mermaid');
// pre > code > svg
svg.closest('pre').replaceWith(svg);
// We need to add the original source into the DOM to allow Copy-as-GFM
// to access it.
const sourceEl = document.createElement('text');
sourceEl.classList.add('source');
sourceEl.setAttribute('display', 'none');
sourceEl.textContent = source;
svg.appendChild(sourceEl);
});
});
}).catch((err) => {
Flash(`Can't load mermaid module: ${err}`);
});
}