generate-slides.js

const util = require("util");
const fs = require("fs");
const rimraf = require("rimraf");
const ncp = require("ncp").ncp;
const chokidar = require("chokidar");
const ncpPromise = util.promisify(ncp);
const args = process.argv.slice(2);

// Configuration
const isWatching = args.includes("watch");
const mainSlideLocation = "./slides/asciidoc/index.adoc";
const outputDir = "./docs/slides/";
const directoryToCopy = ["theme", "fonts", "images", "screencasts"];

if (isWatching) {
  chokidar
    .watch(".", {
      ignored: /(^|[\/\\])\../,
      persistent: true
    })
    .on("all", (event, path) => {
      runWorkFlow();
    });
} else {
  workflow();
}

const runWorkFlow = debounce(function() {
  console.log("📏 👀  change detected !");
  workflow();
}, 2000);

function workflow() {
  console.log("🏗  👷‍  start build slides ... 📺");

  // Clean
  if (fs.existsSync(outputDir)) {
    rimraf.sync(outputDir);
  }

  // Create slides directory
  fs.mkdirSync(outputDir);

  Promise.all(
    directoryToCopy.map(path => {
      ncpPromise(`./slides/${path}`, `${outputDir}${path}`);
    })
  ).then(() => {
    // Load asciidoctor.js and asciidoctor-reveal.js
    const asciidoctor = require("asciidoctor.js")();
    const asciidoctorRevealjs = require("asciidoctor-reveal.js");
    asciidoctorRevealjs.register();

    // Convert the document 'index.adoc' using the reveal.js converter
    const options = { safe: "safe", backend: "revealjs", to_dir: outputDir };
    asciidoctor.convertFile(mainSlideLocation, options);

    console.log("🎉 👌  slides successfully generated");
  });
}

function debounce(func, wait, immediate) {
  let timeout;
  return function() {
    const context = this,
      args = arguments;
    const later = function() {
      timeout = null;
      if (!immediate) func.apply(context, args);
    };
    const callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
    if (callNow) func.apply(context, args);
  };
}