Build changelog from git commit history whenever bumping a version

build/changelog.js

@@ -0,0 +1,35 @@
+var gulp = require('gulp'),
+	util = require('gulp-util'),
+	cat = require('gulp-cat'),
+	git = require('gulp-git'),
+	replace = require('gulp-replace'),
+	path = require('path');
+
+var repo = require('../package.json').repository.url;
+
+gulp.task('changelog', function(done) {
+	git.exec({ args: 'log --oneline --decorate' }, function(err, stdout) {
+		if(err) return done(err);
+		return done(null, gulp.src('CHANGELOG.md')
+			.pipe(replace(/.|\n/g, ''))
+			.pipe(replace(/$/, stdout))
+			.pipe(replace(/#(\d+)/, '[#$1](' + repo + '/issues/$1)'))
+			.pipe(replace(/([a-f0-9]{7}) \(HEAD[^)]*\) (.+)/g, function(_, sha, comment) {
+				return '\n## [Working Changes](' + repo + ')' +
+					'\n- [' + sha + '](' + repo + '/commit/' + sha + ') ' + comment;
+			}))
+			.pipe(replace(/([a-f0-9]{7}) \(tag: ([^\s),]*)[^)]*\) (.+)/g, function(_, sha, tag, comment) {
+				var niceTag = tag;
+				if(tag.indexOf('v') !== 0) niceTag = 'v' + tag;
+				return '\n## [' + niceTag + '](' + repo + '/tree/' + tag + ')' +
+					'\n- [' + sha + '](' + repo + '/commit/' + sha + ') ' + comment;
+			}))
+			.pipe(replace(/([a-f0-9]{7}) (.+)/g, '- [$1](' + repo + '/commit/$1) $2'))
+			.pipe(gulp.dest('.')));
+	});
+});
+
+gulp.task('changelog-commit', function () {
+    return gulp.src('.')
+        .pipe(git.commit('Updated CHANGELOG'));
+});

build/version.js

@@ -36,20 +36,22 @@ gulp.task('version-push', function (cb) {
 
 gulp.task('version-tag', function (cb) {
     var version = getPackageJsonVersion();
-    git.tag('v' + version, 'Version ' + version, function (error) {
-        if (error) {
-            return cb(error);
-        }
-        git.push('origin', 'master', { args: '--tags' }, cb);
-    });
+    git.tag('v' + version, 'Version ' + version, cb);
+});
+
+gulp.task('version-push-tags', function (cb) {
+    git.push('origin', 'master', { args: '--tags' }, cb);
 });
 
 gulp.task('version', function (callback) {
     runSequence(
         'version-bump',
         'version-commit',
-        'version-push',
         'version-tag',
+        'changelog',
+        'changelog-commit',
+        'version-push',
+        'version-push-tags',
         function (error) {
             if (error) {
                 console.log(error.message);