Grunttask to generate a stylus file from an icon folder

grunttask.js

var walk = require('fs-walk');
var fs = require('fs');
grunt.registerTask('generateIconStylus', 'generate a stylus file with all icons', function task() {
  console.log('run it');
  var done = this.async();
  var fd = fs.open('src/atoms/icons.styl', 'w', function(err,fd){
      fs.writeSync(fd,".icon\n");
      walk.walk('src/images/icons', function (basedir, filename, stats, next) {
          var data = fs.readFile(basedir+'/'+filename, 'utf8', function(err,data){
              var name = filename.replace(/\.[^/.]+$/, "");
              var data = new Buffer(data).toString('base64');
              console.log('processing ',name);
              var item = "    ."+name+"\n        background-image: url(data:svg/xml;base64,"+data+")\n\n";
              fs.writeSync(fd, item);
              next();
          });
      }, done);
  });
});