Grunt + LiveReload + LESS + Contao Be sure to have LiveReload Chrome Extension installed

Gruntfile.js

var path = require('path');

// # Globbing
// for performance reasons we're only matching one level down:
// 'test/spec/{,*/}*.js'
// use this if you want to recursively match all subfolders:
// 'test/spec/**/*.js'

module.exports = function(grunt) {

	var dir = grunt.option('dir');
	if(!dir) {
		grunt.fail.fatal('Error: no watching directory specified! Use --dir option.', 1);
	}
	grunt.log.ok('Watching directory: ' + dir);
	
  // load all grunt tasks
  grunt.loadNpmTasks('grunt-contrib-less');
  grunt.loadNpmTasks('grunt-contrib-watch');

  var cfg = {};

  // On demand
  cfg.watch = {
	less: {
		files: [dir + '/**/*.less'],
		tasks: ['less']
	},
    css: {
      files: [dir + '/**/*.css'],
      options: {
        livereload: true
      }
    }
  };



  // LESS
  // running `grunt less` will compile once
  cfg.less = {
    dev: {
      options: {
        paths: [dir + "/**/*.less"],
        yuicompress: false
      },
      files: {}
    }
  };
  cfg.less.dev.files[dir + "/style.css"] = dir+"/less/style.less";

  // init grunt with the config
  grunt.initConfig(cfg);


  // register server task
  grunt.registerTask('default', [
//    'connect',
    'watch'
  ]);


};

package.json

{
  "name": "contao_livereload",
  "version": "0.0.0",
  "description": "Grunt based LiveReload for Contao",
  "dependencies": {},
  "devDependencies": {
    "grunt": "~0.4.2",
    "grunt-contrib-less": "~0.8.3",
    "grunt-contrib-watch": "~0.5.3"
  },
  "author": "Christoph Wiechert",
  "license": "GPL"
}

startScript

#!/bin/bash

GRUNTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

DIR=$1
if [ "$DIR" == "" ]
then
	DIR=.
fi
DIR=`realpath $DIR`

grunt --gruntfile $GRUNTDIR/Gruntfile.js --dir $DIR