index.js

'use strict';

const path = require('path');
const AstPlugins = require('./lib/ast-plugins');
const VersionChecker = require('ember-cli-version-checker');
const SilentError = require('silent-error');
const debugGenerator = require('heimdalljs-logger');
const semver = require('semver');

const _logger = debugGenerator('ember-cli-htmlbars-inline-precompile');

module.exports = {
  name: 'ember-cli-htmlbars-inline-precompile',

  init() {
    this._super.init && this._super.init.apply(this, arguments);

    let checker = new VersionChecker(this);
    let hasIncorrectBabelVersion = checker.for('ember-cli-babel', 'npm').lt('6.7.1');

    if (hasIncorrectBabelVersion) {
      throw new SilentError(`ember-cli-htmlbars-inline-precompile v1.0.0 and above require the ember-cli-babel v6.7.1 or above. To use ember-cli-babel v5.x please downgrade ember-cli-htmlbars-inline-precompile to v0.3.`);
    }
  },

  setupPreprocessorRegistry(type, registry) {
    if (type === 'parent') {
      this.parentRegistry = registry;
    }
  },

  included() {
    this._super.included.apply(this, arguments);

    let projectEmberCliHtmlbars = this.project.findAddonByName('ember-cli-htmlbars');
    if(projectEmberCliHtmlbars && projectEmberCliHtmlbars.inlinePrecompilerRegistered) {
      return;
    }

    let parentEmberCliHtmlbars = this.parent.addons.find(a => a.name === 'ember-cli-htmlbars');
    if (parentEmberCliHtmlbars && semver.gt(parentEmberCliHtmlbars.pkg.version, '4.0.2')) {
      // ember-cli-htmlbars will issue a deprecation message, but we need to
      // ensure that we don't attempt to add the babel plugin
      return;
    }

    let checker = new VersionChecker(this);

    let emberCLIUsesSharedBabelPlugins = checker.for('ember-cli', 'npm').lt('2.13.0-alpha.1');
    let addonOptions = this._getAddonOptions();
    let isProjectDependency = this.parent === this.project;
    let babelPlugins;

    if (emberCLIUsesSharedBabelPlugins && isProjectDependency) {
      addonOptions.babel6 = addonOptions.babel6 || {};
      babelPlugins = addonOptions.babel6.plugins = addonOptions.babel6.plugins || [];
    } else {
      addonOptions.babel = addonOptions.babel || {};
      babelPlugins = addonOptions.babel.plugins = addonOptions.babel.plugins || [];
    }

    let pluginWrappers = this.parentRegistry.load('htmlbars-ast-plugin');

    // add the HTMLBarsInlinePrecompilePlugin to the list of plugins used by
    // the `ember-cli-babel` addon
    if (!this._isBabelPluginRegistered(babelPlugins)) {
      let templateCompilerPath = this.templateCompilerPath();
      let parallelConfig = this.getParallelConfig(pluginWrappers);
      let pluginInfo = AstPlugins.setupDependentPlugins(pluginWrappers);

      if (this.canParallelize(pluginWrappers)) {
        _logger.debug('using parallel API with broccoli-babel-transpiler');
        let parallelBabelInfo = {
          requireFile: path.resolve(__dirname, 'lib/require-from-worker'),
          buildUsing: 'build',
          params: {
            templateCompilerPath,
            parallelConfig
          }
        };

        let cacheKey;
        babelPlugins.push({
          _parallelBabel: parallelBabelInfo,
          baseDir: () => __dirname,
          cacheKey: () => {
            if (cacheKey === undefined) {
              // parallelBabelInfo will not be used in the cache unless it is explicitly included
              cacheKey = AstPlugins.makeCacheKey(templateCompilerPath, pluginInfo, JSON.stringify(parallelBabelInfo));
            }

            return cacheKey;
          },
        });
      }
      else {
        _logger.debug('NOT using parallel API with broccoli-babel-transpiler');
        let blockingPlugins = pluginWrappers.map((wrapper) => {
          if (wrapper.parallelBabel === undefined) {
            return wrapper.name;
          }
        }).filter(Boolean);
        _logger.debug('Prevented by these plugins: ' + blockingPlugins);
        let htmlBarsPlugin = AstPlugins.setup(pluginInfo, {
          projectConfig: this.projectConfig(),
          templateCompilerPath: this.templateCompilerPath(),
        });
        babelPlugins.push(htmlBarsPlugin);
      }
    }
  },

  /**
   * This function checks if 'ember-cli-htmlbars-inline-precompile' is already present in babelPlugins.
   * The plugin object will be different for non parallel API and parallel API.
   * For parallel api, check the `baseDir` of a plugin to see if it has current dirname
   * For non parallel api, check the 'modulePaths' to see if it contains 'ember-cli-htmlbars-inline-precompile'
   * @param {*} plugins
   */
  _isBabelPluginRegistered(plugins) {
    return plugins.some(plugin => {
      if (Array.isArray(plugin)) {
        return plugin[0] === require.resolve('babel-plugin-htmlbars-inline-precompile');
      } else if (plugin !== null && typeof plugin === 'object' && plugin._parallelBabel !== undefined) {
        return plugin._parallelBabel.requireFile === path.resolve(__dirname, 'lib/require-from-worker');
      } else {
        return false;
      }
    });
  },

  _getAddonOptions() {
    return (this.parent && this.parent.options) || (this.app && this.app.options) || {};
  },

  // verify that each registered ast plugin can be parallelized
  canParallelize(pluginWrappers) {
    return pluginWrappers.every((wrapper) => wrapper.parallelBabel !== undefined);
  },

  // return an array of the 'parallelBabel' object for each registered htmlbars-ast-plugin
  getParallelConfig(pluginWrappers) {
    return pluginWrappers.map((wrapper) => wrapper.parallelBabel);
  },

  // borrowed from ember-cli-htmlbars http://git.io/vJDrW
  projectConfig() {
    return this.project.config(process.env.EMBER_ENV);
  },

  // borrowed from ember-cli-htmlbars http://git.io/vJDrw
  templateCompilerPath() {
    let config = this.projectConfig();
    let templateCompilerPath = config['ember-cli-htmlbars'] && config['ember-cli-htmlbars'].templateCompilerPath;

    let ember = this.project.findAddonByName('ember-source');
    if (ember) {
      return ember.absolutePaths.templateCompiler;
    } else if (!templateCompilerPath) {
      templateCompilerPath = this.project.bowerDirectory + '/ember/ember-template-compiler';
    }

    return path.resolve(this.project.root, templateCompilerPath);
  }
};