webcomponentsjs/gulpfile.js

/**
 * @license
 * Copyright (c) 2014 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
 */

// jshint node: true

'use strict';

var audit = require('gulp-audit');
var compilerPackage = require('google-closure-compiler');
var concat = require('gulp-concat');
var exec = require('child_process').exec;
var fs = require('fs');
var gulp = require('gulp');
var header = require('gulp-header');
var path = require('path');
var rename = require('gulp-rename');
var runseq = require('run-sequence');
var uglify = require('gulp-uglify');
var sourcemaps = require('gulp-sourcemaps');
var closureCompiler = compilerPackage.gulp();

// init tests with gulp
require('web-component-tester').gulp.init(gulp);

var isRelease = process.env.RELEASE !== undefined;

var banner = fs.readFileSync('banner.txt', 'utf8');

var pkg;

function defineBuildTask(name, manifest) {
  (function() {

    manifest = manifest || './src/' + name + '/build.json';
    var output = name;
    var list = readManifest(manifest);
    gulp.task(name + '-debug', ['version'], function() {
      return gulp.src(list)
      .pipe(concat(output + '.js'))
      .pipe(uglify({
        mangle: false,
        compress: false,
        output: {
          beautify: true,
          indent_level: 2
        }
      }))
      .pipe(header(banner, {pkg: pkg}))
      .pipe(gulp.dest('dist/'))
      ;
    });

    gulp.task(name, ['version', name + '-debug'], function() {
      return gulp.src(list)
      .pipe(concat(output + '.min.js'))
      .pipe(uglify())
      .pipe(header(banner, {pkg: pkg}))
      .pipe(gulp.dest('dist/'))
      ;
    });

  })();
}

function readJSON(filename) {
  var blob = fs.readFileSync(filename, 'utf8');
  return JSON.parse(blob);
}

gulp.task('audit', function() {
  return gulp.src('dist/*.js')
  .pipe(audit('build.log', {repos:['.']}))
  .pipe(gulp.dest('dist/'));
});

gulp.task('version', function(cb) {
  pkg = require('./package.json');
  var cmd = ['git', 'rev-parse', '--short', 'HEAD'].join(' ');
  if (!isRelease) {
    exec(cmd, function(err, stdout, stderr) {
      if (err) {
        return cb(err);
      }
      if (stdout) {
        stdout = stdout.trim();
      }
      pkg.version = pkg.version + '-' + stdout;
      cb();
    });
  } else {
    cb();
  }
});

function readManifest(filename, modules) {
  modules = modules || [];
  var lines = readJSON(filename);
  var dir = path.dirname(filename);
  lines.forEach(function(line) {
    var fullpath = path.join(dir, line);
    if (line.slice(-5) == '.json') {
      // recurse
      modules = modules.concat(readManifest(fullpath, modules));
    } else {
      modules.push(fullpath);
    }
  });
  var tmp = Object.create(null);
  for (var i = 0; i < modules.length; i++) {
    tmp[modules[i]] = 1;
  }
  modules = Object.keys(tmp);
  return modules;
}

gulp.task('copy-bower', function() {
  return gulp.src(['bower.json', 'package.json', 'README.md']).pipe(gulp.dest('dist/'));
});

defineBuildTask('webcomponents', './src/WebComponents/build.json');
defineBuildTask('webcomponents-lite', './src/WebComponents/build-lite.json');
defineBuildTask('CustomElements');
defineBuildTask('HTMLImports');
defineBuildTask('ShadowDOM');
defineBuildTask('MutationObserver');

gulp.task('CustomElementsV1', function () {
  return gulp.src('./src/CustomElements/v1/CustomElements.js', {base: './'})
      .pipe(sourcemaps.init())
      .pipe(closureCompiler({
          compilation_level: 'ADVANCED',
          warning_level: 'VERBOSE',
          language_in: 'ECMASCRIPT6_STRICT',
          language_out: 'ECMASCRIPT5_STRICT',
          externs: 'externs/html5.js',
          js_output_file: 'CustomElementsV1.min.js',
          new_type_inf: true,
          rewrite_polyfills: false,
        }))
      .pipe(sourcemaps.write('/'))
      .pipe(gulp.dest('./dist'));
});

gulp.task('build', ['webcomponents', 'webcomponents-lite', 'CustomElements',
  'CustomElementsV1', 'HTMLImports', 'ShadowDOM', 'copy-bower',
  'MutationObserver']);

gulp.task('release', function(cb) {
  isRelease = true;
  runseq('build', 'audit', cb);
});

gulp.task('default', function(cb) {
  runseq('build', 'audit', cb);
});