Grunt file for Auto-exporting Pixelmator saving, with project reload

Gruntfile.js

module.exports = function(grunt) {

    // Project configuration.
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

    watch: {
      src: {
        files   : ['digibots/res/**/*.{png,jpg,jpeg,gif}', 'digibots/scripts/**/*.js', 'digibots/index.html'],
        options : {
          livereload: {
            liveImg: false
          },
          nospawn: true
        }
      },
      res: {
        files   : ['digibots/res/**/*.pxm'],
        tasks   : ['pxm2png'],
        options : {
          nospawn: true
        },
        modified: []
      }
    }
  });

  grunt.registerTask('pxm2png', 'convert Pixelmator files to pngs', function() {
    grunt.log.writeln('Converting pxm file: ' + grunt.config("res.modified"));
    var cp = grunt.util.spawn({
      cmd: "./pxm2png",
      args: grunt.config("res.modified")
    }, function (err, res, code) {
      if (code !== 0) {
        grunt.log.writeln("Error converting .pxm file:", err, res, code);
      }
    });

  });

  // Set the pxm file changed to be retrieved by pxm2png task
  grunt.event.on('watch', function(action, filepath) {
    if (grunt.file.isMatch('digibots/res/*.pxm', filepath)) {
      grunt.log.writeln('setting file path:' + filepath);
      grunt.config("res", { modified: [filepath] })
    }
  });


  // Load plugin
  grunt.loadNpmTasks('grunt-contrib-watch');

  // Default task(s).
  grunt.registerTask('default', []);
};

Can you tell me where I can find pxm command line tools ? (Can really find them myself)

@Silom here you go https://github.com/keyvanfatehi/grunt-pxm2png