md-mermaid-to-pdf/lib/get-marked-with-highlighter.js

CLI tool for converting Markdown files to PDF with support for Mermaid graphics.

const marked = require('marked');
const { getLanguage, highlight } = require('highlight.js');
const fs = require('fs');
const path = require('path');

//let nodePath = process.env.NODE_PATH;
let nodePath = process.env;
console.log('nodePath:', __dirname);

const mermaidCode = fs.readFileSync(__dirname + '/mermaid.js', 'utf8');
console.log('mermaidCode:', mermaidCode.length);

/**
 * Get a marked renderer with an attached highlighter.
 *
 * @param {Object} options Marked configuration object
 *
 * @returns a marked renderer with highlight.js parser attached
 */
module.exports = options => {
    const renderer = options.renderer || new marked.Renderer();

    if (!Object.prototype.hasOwnProperty.call(renderer, 'code')) {
        renderer.code = (code, language) => {
            if (language && language.match(/\bmermaid\b/i)) {
                console.log('is mermaid');
                return `
					
					<div class="mermaid">${code}</div>
					`;
            }

            // if the given language is not available in highlight.js, fall back to plaintext
            language = (getLanguage(language) && language) || 'plaintext';

            return `<pre><div class="${language}">${highlight(language, code).value}</div></pre>`;
        };
    }

    marked.setOptions({...options, renderer });

    return marked;
};