#!/usr/bin/env node
const path = require('path');
const globby = require('globby');
const fs = require('fs');
const {promisify} = require('util');
const readFile = promisify(fs.readFile);
const appendFile = promisify(fs.appendFile);

/** bundles the files  */

async function bundle() {
  /**  gets the path of config file*/
  const configPath = path.join(process.cwd(), 'bundler.js');
  /**  import the config file*/
  const config = require(configPath); // <-
  /** gets the list of filenames to bundle*/
  const files = await globby([config.src]);
  /** Iterates each file by their name */
  Promise.all(files.map(async (file) => {
    /**  read the file in text formate */
    const fileContent = await readFile(file);
    /** add comment line in dist.js */
    await appendFile(path.join(process.cwd(), 'dist', 'dist.js'), `/** File Name: ${path.basename(file)}*/ \n`);
    /** append file content in dist.js */
    await appendFile(path.join(process.cwd(), 'dist', 'dist.js'), fileContent+'\n');
  }))
}

bundle();