xm-select/build/md-loader/containers.js

const mdContainer = require('markdown-it-container');

module.exports = md => {
	md.use(mdContainer, 'demo', {
		validate(params) {
			return params.trim().match(/^demo\s*(.*)$/);
		},
		render(tokens, idx) {
			const m = tokens[idx].info.trim().match(/^demo\s*(.*)$/);
			if (tokens[idx].nesting === 1) {
				const description = m && m.length > 1 ? m[1] : '';
				const content = tokens[idx + 1].type === 'fence' ? tokens[idx + 1].content : '';
				return 	`<demo-block>
						${description ? `<div>${md.render(description)}</div>` : ''}
						<!--element-demo: ${content}:element-demo-->
						`;
			}
			return '</demo-block>';
		}
	});

	md.use(mdContainer, 'tip');
	md.use(mdContainer, 'warning');
};