dirtree - shows you where you are in a filesystem tree and some of what's around

dirtree.js

#!/usr/bin/env node

/* Copyright 2017 CR Drost.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
 * the MPL was not distributed with this file, uou can obtain one at https://mozilla.org/MPL/2.0/. 
 */

const fs = require('fs'),
  bold = text => '\u001b[1m' + text + '\u001b[22m',
  red = text => '\u001b[31m' + text + '\u001b[39m',
  id = text => text;

let data = process
  .cwd()
  .split('/')
  .slice(1)
  .reverse()
  .map((x, i) => {
    let dir = [...Array(i + 1)].map(_ => '..').join('/'), ls;
    try {
      ls = fs.readdirSync(dir).filter(name => name[0] != '.').filter(s => {
        try {
          return fs.statSync(dir + '/' + s).isDirectory();
        } catch (yolo) {
          return false;
        }
      });
      return { before: ls.filter(q => q < x), curr: x, after: ls.filter(q => q > x), err: false };
    } catch (e) {
      return { before: [], curr: x, after: [], err: true };
    }
  })
  .reduce(
    ({ err, acc }, x) => ({
      err: x.err,
      acc: (x.before.length ? x.before.join('\n') + '\n' : '') +
        (err ? red : id)(bold(x.curr)) +
        (acc === '' ? '' : '\n    ' + acc.replace(/\n/g, '\n    ')) +
        (x.after.length ? '\n' + x.after.join('\n') : '')
    }),
    { err: false, acc: '' }
  );

console.log((data.err ? red : id)(bold('/')) + '\n    ' + data.acc.replace(/\n/g, '\n    '));