index.js

/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
'use strict';

// Based on similar script in Jest
// https://github.com/facebook/jest/blob/master/scripts/prettier.js

const chalk = require('chalk');
const glob = require('glob');
const path = require('path');
const execFileSync = require('child_process').execFileSync;

const shouldWrite = process.argv[2] === 'write';
const isWindows = process.platform === 'win32';
const prettier = isWindows ? 'prettier.cmd' : 'prettier';
const prettierCmd = path.resolve(__dirname, '../../node_modules/.bin/' + prettier);
const defaultOptions = {
  'bracket-spacing': 'false',
  'single-quote': 'true',
  'jsx-bracket-same-line': 'true',
  'trailing-comma': 'all',
  'print-width': 80,
};
const config = {
  default: {
    patterns: ['src/**/*.js'],
    ignore: [
      '**/third_party/**',
      '**/node_modules/**',
    ],
  },
  addons: {
    patterns: ['addons/**/*.js'],
    ignore: [
      '**/node_modules/**',
    ],
    options: {
      // We don't compile them with Babel, and
      // trailing commas break GCC.
      'trailing-comma': 'none',
    },
  },
};

function exec(command, args) {
  console.log('> ' + [command].concat(args).join(' '));
  var options = {};
  return execFileSync(command, args, options).toString();
}

Object.keys(config).forEach(key => {
  const patterns = config[key].patterns;
  const options = config[key].options;
  const ignore = config[key].ignore;

  const globPattern = patterns.length > 1
    ? `{${patterns.join(',')}}`
    : `${patterns.join(',')}`;
  const files = glob.sync(globPattern, {ignore});

  const args = Object.keys(defaultOptions).map(
    k => `--${k}=${(options && options[k]) || defaultOptions[k]}`
  );
  args.push(`--${shouldWrite ? 'write' : 'l'}`);

  try {
    exec(prettierCmd, [...args, ...files]);
  } catch (e) {
    if (!shouldWrite) {
      console.log(
        '\n' +
        chalk.red(
          `  This project uses prettier to format all JavaScript code.\n`
        ) +
          chalk.dim(`    Please run `) +
          chalk.reset('yarn prettier') +
          chalk.dim(` and add changes to files listed above to your commit.`) +
          `\n`
      );
      process.exit(1);
    }
    throw e;
  }
});