directoryMap.js

const fs = require('fs');
const path = require('path');

async function walk(dir) {
  return new Promise((resolve, reject) => {
    fs.readdir(dir, (error, files) => {
      if (error) return reject(error);
      Promise.all(files.map((file) => {
        return new Promise((resolve, reject) => {
          const filepath = path.join(dir, file);
          fs.stat(filepath, (error, stats) => {
            if (error) return reject(error);
            if (stats.isDirectory()) {
              walk(filepath).then(resolve);
            } else if (stats.isFile()) {
              resolve(filepath);
            }
          });
        });
      }))
      .then((foldersContents) => {
        resolve(foldersContents.reduce((all, folderContents) => all.concat(folderContents), []));
      });
    });
  });
}

async function getDirectoryMap(dir) {
	let files = await walk(dir);
	let directory = {};
	files.forEach(f => {
		let fragments = f.split('/');
		let component = directory;
		for (let i = 0; i<fragments.length; i++) {
			let frag = fragments[i];
			if(i==fragments.length-1) {
				if(!component.files) component.files = [];
				component.files.push(frag);
				return;
			}
			if(!component[frag]) component[frag] = {};
			component = component[frag];
		}
	});
	return directory;
}

module.exports = getDirectoryMap;