gulpfile.js

'use strict';

const fs = require('fs');
const path = require('path');
const gulp = require('gulp');
const gutil = require('gulp-util');
const gulpLoadPlugins = require('gulp-load-plugins');
const wiredep = require('wiredep').stream;
const del = require('del');
const mainBowerFiles = require('main-bower-files');
const injectStr = require('gulp-inject-string');

const g = gulpLoadPlugins();

const SRC_DIR = './src';
const DIST_DIR = './public';

const env = process.env.NODE_ENV || 'development';
const isProduction = env === 'production';

let FIREBASE_PROJECT_ID = null;
let FIREBASE_API_KEY = null;

const buildWebpackConfig = () => {
  const config = {
    entry: './src/js/main.js',
    output: {
      path: path.join(__dirname, 'public', 'js'),
      filename: 'main.js'
    },
    debug : !isProduction,
    module: {
      loaders: [{
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel',
        query: {
          presets: ['es2015']
        }
      }]
    }
  };

  if (!isProduction) {
    config.devtool = 'eval';
  }

  return config;
};
const webpackConfig = buildWebpackConfig();

gulp.task('clean', () => {
  del([DIST_DIR]);
});

gulp.task('firebase_config', (cb) => {
  fs.readFile('./README.md', (err, contents) => {
    if (err) {
      return cb(err);
    }
    contents = contents.toString();
    FIREBASE_PROJECT_ID = contents.match(/FIREBASE_PROJECT_ID\:(.*)/)[1].trim();
    FIREBASE_API_KEY = contents.match(/FIREBASE_API_KEY\:(.*)/)[1].trim();
    if (process.env.FIREBASE_PROJECT_ID) {
      FIREBASE_PROJECT_ID = process.env.FIREBASE_PROJECT_ID;
    }
    if (process.env.FIREBASE_API_KEY) {
      FIREBASE_API_KEY = process.env.FIREBASE_API_KEY;
    }
    if (!FIREBASE_PROJECT_ID || !FIREBASE_API_KEY) {
      return cb(new Error('Firebase Project Id and API key not configured!'));
    }
    cb();
  });
});

gulp.task('styles', ['vendorstyles'], () => {
  const injectAppFiles = gulp.src(path.join(SRC_DIR, '/styles/app/**/*.scss'), {
    read: false
  });
  const injectGlobalFiles = gulp.src(path.join(SRC_DIR, '/styles/global/*.scss'), {
    read: false
  });
  const transformFilepath = (filepath) => {
    return `@import "${filepath}";`;
  };
  const injectAppOptions = {
    transform: transformFilepath,
    starttag: '// inject:app',
    endtag: '// endinject',
    addRootSlash: false
  };
  const injectGlobalOptions = {
    transform: transformFilepath,
    starttag: '// inject:global',
    endtag: '// endinject',
    addRootSlash: false
  };

  return gulp.src(path.join(SRC_DIR, '/styles/main.scss'))
    .pipe(wiredep())
    .pipe(g.inject(injectGlobalFiles, injectGlobalOptions))
    .pipe(g.inject(injectAppFiles, injectAppOptions))
    .pipe(g.sass())
    .pipe(g.csso())
    .pipe(gulp.dest(path.join(DIST_DIR, '/styles')));
});

gulp.task('vendorstyles', () => {
  return gulp.src(mainBowerFiles())
    .pipe(g.filter('*.css'))
    .pipe(g.concat('vendors.css'))
    .pipe(g.csso())
    .pipe(gulp.dest(path.join(DIST_DIR, '/styles')));
});

gulp.task('scripts', () => {
  return gulp.src(webpackConfig.entry)
    .pipe(g.webpack(webpackConfig))
    .pipe(isProduction ? g.uglify() : g.util.noop())
    .pipe(gulp.dest(path.join(DIST_DIR, '/js')));
});

gulp.task('build', ['clean', 'firebase_config', 'styles', 'scripts'], () => {
  const injectFiles = gulp.src([
    path.join(DIST_DIR, '/styles/main.css'),
    path.join(DIST_DIR, '/styles/vendors.css'),
    path.join(DIST_DIR, '/js/main.js')
  ]);
  const injectOptions = {
    addRootSlash: false,
    ignorePath: ['src', 'public']
  };

  return gulp.src(path.join(SRC_DIR, '/index.html'))
    .pipe(g.inject(injectFiles, injectOptions))
    .pipe(injectStr.replace('FIREBASE_API_KEY', FIREBASE_API_KEY))
    .pipe(injectStr.replace('FIREBASE_PROJECT_ID', FIREBASE_PROJECT_ID))
    .pipe(gulp.dest(DIST_DIR));
});

gulp.task('watch', ['default'], () => {
  g.livereload.listen();
  gulp.watch('public/**/*').on('change', g.livereload.changed);
  gulp.watch(path.join(SRC_DIR, '/**/*.*'), ['build']);

  return g.serve({
    root: ['public'],
    port: 3001
  })();
});

gulp.task('default', ['build']);