polyserve/src/config.ts

A simple dev server for bower components

/**
 * @license
 * Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */

import * as bowerConfig from 'bower-config';
import * as fs from 'fs';
import * as path from 'path';

import {ServerOptions} from './start_server';

function readConfigSync(
    filename: 'bower.json'|'package.json', root?: string): {name?: string} {
  const configPath = path.resolve(root || '', filename);
  let config;
  try {
    config = fs.readFileSync(configPath, 'utf-8');
  } catch (e) {
    return {};
  }
  try {
    return JSON.parse(config);
  } catch (e) {
    console.error(`Could not parse ${configPath}`);
    console.error(e);
  }
  return {};
}

/**
 * Determines the package name by reading from the following sources:
 *
 * 1. `options.packageName`
 * 2. bower.json, if options.npm is not true
 * 3. package.json
 * 4. The name of the root directory
 */
export function getPackageName(options: ServerOptions) {
  return options.packageName ||
      !options.npm && readConfigSync('bower.json', options.root).name ||
      readConfigSync('package.json', options.root).name ||
      path.basename(options.root);
}

export function getComponentDir(options: ServerOptions) {
  const root = options.root || process.cwd();
  const bowerDir = bowerConfig.read(root).directory;
  return options.componentDir || (options.npm ? 'node_modules' : bowerDir);
}