/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

module.exports = (gulp) => () => {
  const tag = process.env.TAG;
  const ptag = process.env.PREVIOUS_ZONE_TAG;
  const conventionalChangelog = require('gulp-conventional-changelog');
  // the tag of zone.js will start with `zone.js-`, such as `zone.js-0.10.0`
  // we will remove the first 8 (zone.js-) chars to get the real version.
  const version = tag.replace(/^zone\.js-/, '');
  return gulp.src('packages/zone.js/CHANGELOG.md')
      .pipe(conventionalChangelog(
          {
            preset: 'angular',
          },
          {linkCompare: true, previousTag: ptag, currentTag: tag, version: version}, {
            // Ignore commits that have a different scope than `zone.js`.
            extendedRegexp: true,
            grep: '^[^(]+\\(zone\\.js\\)',
            from: ptag,
            to: 'HEAD',
          }))
      .pipe(gulp.dest('./packages/zone.js/'));
};