Grunt task to pre-compile HTMLBars templates

Grunt-HTMLBars.js

'use strict';
var fs = require('fs');
var path = require('path');
var templateCompiler = require('./bower_components/ember/ember-template-compiler');

var templatesPath = 'templates'

module.exports = function (grunt) {

  grunt.initConfig({
    pkg: grunt.file.readJSON('./package.json'),
    compileHtmlBars: {
      build: {
        templateBasePath: templatesPath,
        src: [templatesPath + '**/*.hbs'],
        dest: 'templates.js'
      }
    }
  });
    
  grunt.registerMultiTask('compileHtmlBars', 'Pre-compile HTMLBars tempates', function() {

    var done = this.async();

    this.files.forEach(function (file) {

      var stream = fs.createWriteStream(path.join(__dirname, file.dest), {
        encoding: 'utf8'
      });

      stream.once('open', function (fd) {
        grunt.log.writeln('Pre-compiling ' + file.src.length + ' handlebars templates...');

        // process each template
        file.src.forEach(function (f) {

          // load the template
          var template = fs.readFileSync(path.join(__dirname, f), {
            encoding: 'utf8'
          });
          var name = f.replace(new RegExp('^' + file.templateBasePath), '').replace(/\.hbs$/, '');

          // compile the template
          stream.write('Ember.TEMPLATES["' + name + '"] = Ember.HTMLBars.template(');
          stream.write(templateCompiler.precompile(template) + ');\n\n');
        });

        stream.end(done);
      });
    });
  });
};

Updated for ember 1.10.0-beta.2