Recursive delete all empty directory trees

deleteEmptyTrees.js

'use strict';

var walk = require('walkdir');
var fs   = require('fs');
var path = require('path');
var extfs = require('extfs');

var deleteEmptyPath = function deleteEmptyPath(delPath, cb) {
  extfs.isEmpty(delPath, function (isEmpty) {
    if (isEmpty) {
      fs.rmdir(delPath, function(err) {
        console.log('removed empty directory', delPath);
        // Walk up and check for emptiness until
        // we find a non-empty directory, deleting all the way
        deleteEmptyPath(path.dirname(delPath), cb);
      });
    } else {
      cb();
    }
  });
};

var killDirs = function(emptyDirs, done) {
  if (emptyDirs.length) {
    deleteEmptyPath(emptyDirs.pop(), function() {
      // The path and any empty parents have been removed
      // Call on the next deep path
      killDirs(emptyDirs, done);
    });
  } else {
    done();
  }
};

(function deleteEmptyDirTrees() {
  var emptyDirs = [];
  var walker = walk('./stuff');

  // This will emit on an empty directory
  // but not on the empty directory's parents
  // because they are not empty YET
  walker.on('empty', function (emptyPath, stat) {
    emptyDirs.push(emptyPath);
  });
  walker.on('end', function() {
    killDirs(emptyDirs, function() {
      // Done.
    });
  });
})();