pen/src/markdown.js

A better Markdown previewer

"use strict";

const argv = require("./argv");
const mdit = require("markdown-it");
const pandoc = require("simple-pandoc");

const singleton = creator => {
  let obj;
  return () => obj || (obj = creator());
};

const md = singleton(() =>
  mdit({ html: true, linkify: true })
    .use(require("markdown-it-highlightjs"))
    .use(require("markdown-it-emoji"))
    .use(require("markdown-it-checkbox"))
    .use(require("markdown-it-anchor"))
);

const pd = singleton(() => pandoc(argv.pandoc, "html"));

module.exports = markdown =>
  argv.pandoc ? pd()(markdown) : Promise.resolve(md().render(markdown));