Batch Resize & Append with node

package.json

{
  "name": "resizer",
  "version": "1.0.0",
  "description": "",
  "main": "resizer.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "glob": "^5.0.10",
    "gm": "^1.18.1",
    "imagemagick": "^0.1.3",
    "minimist": "^1.1.1",
  }
}

resizer.js

//@ sourceURL=resizer.js

var glob = require('glob')
var argv = require('minimist')(process.argv.slice(2));
var fs = require('fs');  
var gm = require('gm');

var imagehandler = function (err) {
    if (err) return console.dir(arguments)
    //console.log(this.outname + ' created  :: ' + arguments[3])
    process.stdout.write("Remaining Images " + files.length + " Current File: " + this.outname + " \r");
    nextStep(undefined)
};
    
var w = parseInt(argv.w);
var h = parseInt(argv.h);
var ext = 'png';
var outName = __dirname + "/imgs/"+ argv.i + "-" + w + "x" +h+ "-v."+ext
var files = [];
// options is optional
glob(argv.f + "/*.jpg", undefined, function (er, files) {
  nextStep(files);
});

var nextStep = function (f) {
  if(f !== undefined) {
    files = f;
    
    gm(f.pop())
    .resize(null, h)
    .gravity("center")
    .crop(w,h)
    .stream(ext, function (err, stdout, stderr) {
      if(err) return console.dir(arguments);
      var ws = fs.createWriteStream(outName);
      stdout.pipe(ws);
      nextStep(undefined);
    });
    return;
  } else {
    if(files.length == 0) {
      process.stdout.write(" \n\r");
      return;
    }
    var n = files.pop();
    gm(n)
    .resize(null, h)
    .gravity("center")
    .crop(w,h)
    .stream(ext, function (err, stdout, stderr) {
      if(err) return console.dir(arguments);
      gm(stdout).append(outName)
      .write(outName, imagehandler);
    });
  }
}