ref ctalkington/node-archiver #44

index.js

var fs = require('fs')
var path = require('path')
var zlib = require('zlib')
var ls = require('ls-stream')
var archiver = require('archiver')
var lazystream = require('lazystream')

module.exports = streamFolder

function streamFolder(dir) {
  var gzipper = zlib.createGzip()
  var archive = archiver('tar')
  var done
  var pending = 0
  
  archive.on('error', function(err) {
    throw err
  })

  archive.pipe(gzipper)

  ls(dir)
    .on('data', function(file) {
      if (!file.stat.isFile()) return
      var relPath = path.relative(dir, file.path)
      var fileData

      var source = new lazystream.Readable(function(options) {
        return fs.createReadStream(file.path);
      });

      pending++
      archive.append(source, { name: relPath })
      finish()
    })
    .on('end', function() {
      done = true
    })
  
  function finish() {
    pending--
    if (pending !== 0 || !done) return
    archive.finalize()
  }

  return gzipper
}