build(changelog): remove old changelog script and add gulp task

gulpfile.js

@@ -113,6 +113,23 @@ gulp.task('serve', () => {
 });
 
 
+gulp.task('changelog', () => {
+  const conventionalChangelog = require('gulp-conventional-changelog');
+
+  return gulp.src('CHANGELOG.md')
+    .pipe(conventionalChangelog({
+      preset: 'angular',
+      releaseCount: 1
+    }, {
+      // Conventional Changelog Context
+      // We have to manually set version number so it doesn't get prefixed with `v`
+      // See https://github.com/conventional-changelog/conventional-changelog-core/issues/10
+      currentTag: require('./package.json').version
+    }))
+    .pipe(gulp.dest('./'));
+});
+
+
 function tsc(projectPath, done) {
   let child_process = require('child_process');
 

scripts/publish/changelog.js

@@ -1,39 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-/**
- * Just a small command-line wrapper around the conventional-changelog npm module
- * (https://www.npmjs.com/package/conventional-changelog), which also prepends
- * changes to CHANGELOG.md.
- *
- * Appends CHANGELOG.md with the changes between tag and HEAD.
- * NOTE: only `fix`, `feat`, `perf` and `revert` commits are used
- * see: https://github.com/conventional-changelog/conventional-changelog/blob/v0.2.1/presets/angular.js#L24
- */
-
-var fs = require('fs');
-var cl = require('conventional-changelog');
-const exec = require('child_process').exec;
-
-var changelogStream = fs.createWriteStream('CHANGELOG-delta.md');
-
-if (process.argv.length < 3) {
-  console.log('Usage: ./scripts/publish/changelog.js <start-tag>');
-  process.exit(-1);
-}
-
-var config = {
-  preset: 'angular',
-  releaseCount: 1,
-};
-
-var prependDelta = function() {
-  exec('cat CHANGELOG-delta.md CHANGELOG.md > CHANGELOG-new.md;' +
-       'mv CHANGELOG-new.md CHANGELOG.md;' +
-       'rm CHANGELOG-delta.md');
-}
-
-cl(config, null, {from: process.argv[2]}).on('error', function(err) {
-            console.error('Failed to generate changelog: ' + err);
-          }).pipe(changelogStream).on('close', prependDelta);