grunt-closure-coffee-stack/tasks/templates.js

Everything you need for Google Closure. Precise configuration, Soy templates, localization, TDD stack, and even CoffeeScript support. File watcher included.

/*
 * grunt-este
 * https://github.com/este/grunt-este
 * https://developers.google.com/closure/templates/docs/javascript_usage
 *
 * Copyright (c) 2013 Daniel Steigerwald
 */
module.exports = function (grunt) {

  var detectFastJavaFlags = require('../lib/detectfastjavaflags');

  grunt.registerMultiTask('templates', 'Google Closure Templates compiler',
    function () {

      var options = this.options({
        soyToJsJarPath: './bower_components/closure-templates/SoyToJsSrcCompiler.jar',
        outputPathFormat: this.data.dest + '/{INPUT_FILE_NAME_NO_EXT}.js',
        shouldGenerateJsdoc: true,
        bidiGlobalDir: 1,
        codeStyle: 'concat',
        shouldGenerateGoogMsgDefs: true,
        shouldProvideRequireSoyNamespaces: true
      });
      var filesSrc = this.filesSrc;
      var done = this.async();

      if (Object.keys(filesSrc).length !== 0) {
        detectFastJavaFlags(grunt, function(fastJavaFlags) {
          build(options, filesSrc, done, fastJavaFlags);
        });
      }
      else {
        done();
      }
    });

  var build = function(options, filesSrc, done, fastJavaFlags) {
    var args = ['-jar']
      .concat(fastJavaFlags)
      .concat(options.soyToJsJarPath);

    delete options.soyToJsJarPath;

    for (var option in options) {
      args.push('--' + option);
      if (options[option] !== true)
        args.push(options[option]);
    }
    args.push.apply(args, filesSrc);

    var onSpawnDone = function(error, result, code) {
      if (error) {
        var msg = extractErrorMessage(error);
        grunt.log.error(msg);
        done(false);
      }
      else {
        filesSrc.forEach(function(item) {
          grunt.log.writeln('File ' + item.cyan + ' compiled.');
        });
        done();
      }
    };

    grunt.util.spawn({
      cmd: 'java',
      args: args
    }, onSpawnDone);

  };

  /**
    Remove stack trace.
    @param {Error} error
    @return {string}
  */
  var extractErrorMessage = function(error) {
    msg = error.toString();
    match = msg.match(/com.google.template.soy.base.SoySyntaxException: (.+)/);
    if (match && match[1])
      return match[1];
    return msg;
  };

};