Retire obsolete files/directories to another directory.

retire.js

/**
 * retire.js - Retire obsolete files/directories to another directory.
 */
 
const path = require('path');
const fs = require('fs');
const fse = require('fs-extra');
const chalk = require('chalk');

const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);

// Array to store all the files/dirs we want to retire.
const retirees = [
    'buildConfig',
    'gulpTasks',
    'src/system.config.js',
    'src/jspm_packages',
    'gulpfile.js',
    'karma.conf.js'
  ],
  succeeded = [],
  failed = [];

async function retire() {
  // Make a directory to store retired stuff. We don't want to delete them for
  // all time because we may need to reference an old configuration.
  const retired = await fse.mkdirs(resolveApp('retired'));
  if (!fse.pathExists(retired)) error('Error creating retired dir');

  for (let r in retirees) {
    const src = resolveApp(retirees[r]),
      dest = resolveApp('retired/' + retirees[r]);

    try {
      // First, make a copy of the files/dirs we want to retire.
      await fse.copy(src, dest);
      succeeded.push(`${src} moved to ${dest}`);

      // Second, if the file/dir was successfully copied, delete the original.
      await fse.remove(src);
    } catch (err) {
      failed.push(error(err));
    }
  }
}

function message(msg, type) {
  switch (type) {
  case 'error':
    return chalk.red(msg);
  case 'warn':
    return chalk.yellow(msg);
  default:
    return chalk.green(msg);
  }
}

function error(err) {
  if (err.hasOwnProperty('code')) {
    switch (err.code) {
    case 'ENOENT':
      return message(`No such file or directory ${err.path}`, 'error');
    default:
      return message('An unkown error has occurred.', 'error');
    }
  } else {
    return message(err, 'error');
  }
}

function showSucceeded() {
  if (succeeded.length === 0) return '';
  let msg = message(
    `${succeeded.length} files/dirs were successfully retired.`
  );
  for (let s in succeeded) msg += message(`\n${succeeded[s]}`);
  return msg;
}

function showFailed() {
  if (failed.length === 0) return '';
  let msg = message(
    `${failed.length} files/dirs were not successfully retired.`,
    'error'
  );
  for (let f in failed) msg += message(`\n${failed[f]}`);
  return msg;
}

retire().then(() => {
  console.log(
    `\nRetirement has completed. Here are the results.\n\n${showSucceeded()}\n\n${showFailed()}\n`
  );
});