build.js

#!/usr/bin/env node

/* eslint-env node */
/* eslint-disable no-console */

// Build deployable version to TARGET_DIR

const fs = require("fs-extra"),
  https = require("https"),
  TARGET_DIR = "build/",
  CONFIG_FILE = "build/resources/js/Config.js",
  VERSION_PLACEHOLDER = "$VERSION",
  version = require("./package.json").version,
  fileList = [{
      url: "https://lab.las3.de/gitlab/eye-tracking-classroom/gaze-client.js/raw/master/build/gazeclient.js",
      localPath: "build/vendors/gazeclient.js",
    },
    {
      url: "https://lab.las3.de/gitlab/eye-tracking-classroom/gaze-client.js/raw/master/build/gazeclient.js.map",
      localPath: "build/vendors/gazeclient.js.map",
    },
    {
      url: "https://lab.las3.de/gitlab/eye-tracking-classroom/gaze-client.js/raw/master/build/gazeclient.min.js",
      localPath: "build/vendors/gazeclient.min.js",
    },
  ];

function run() {
  createTargetDir();
  downloadLibrary();
  copyFiles();
  insertVersionNumber();
}

function onError(error) {
  console.log(error);
}

function createTargetDir() {
  console.log(`Ensure target directory [${TARGET_DIR}] exists and is empty`);
  fs.ensureDirSync(TARGET_DIR);
  fs.emptyDirSync(TARGET_DIR);
}

function downloadLibrary() {
  console.log(`Downloading client library (${fileList.length} files]`);
  let vendorsFolder = `${TARGET_DIR}vendors`;
  fs.ensureDirSync(vendorsFolder);
  for (let i = 0; i < fileList.length; i++) {
    let file = fileList[i];
    downloadFile(file.url, file.localPath);
  }
}

function downloadFile(source, target) {
  let file;
  console.log(`Downloading [${source}] to ${target}`);
  file = fs.createWriteStream(target);
  https.get(source, function(response) {
    response.pipe(file);
  });
}

function copyFiles() {
  console.log(`Copying files to ${TARGET_DIR}`);
  fs.copySync("resources/", `${TARGET_DIR}resources`);
  fs.copySync("index.html", `${TARGET_DIR}index.html`);
}

function insertVersionNumber() {
  console.log(`Replacing version placeholder in ${CONFIG_FILE}`);
  let result;
  fs.readFile(CONFIG_FILE, "utf8", function(err, data) {
    if (err) {
      onError(err);
    }
    result = data.replace(VERSION_PLACEHOLDER, version);
    fs.writeFile(CONFIG_FILE, result, "utf8", function(err) {
      if (err) {
        onError(err);
      }
    });
  });
}

run();