feat: generate changelog and copy old CHANGEFILE (#1805)

* feat: changelog command

* chore: add old changelog

* chore: new changelog version

* chore: don't bump pkg version

* chore: remove chore and tests from changelog

Co-authored-by: Rishabh Chawla <rishabh31121999@gmail.com>

build/changelog-generator/index.js

@@ -0,0 +1,93 @@
+/**
+ * @license Copyright 2017 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ *  Based on: https://github.com/GoogleChrome/lighthouse/blob/master/build/changelog-generator/
+ */
+'use strict';
+const readFileSync = require('fs').readFileSync;
+const resolve = require('path').resolve;
+const mainTemplate = readFileSync(resolve(__dirname, 'templates/template.hbs')).toString();
+const headerPartial = readFileSync(resolve(__dirname, 'templates/header.hbs')).toString();
+const commitPartial = readFileSync(resolve(__dirname, 'templates/commit.hbs')).toString();
+
+const pullRequestRegex = /\(#(\d+)\)$/;
+const parserOpts = {
+    headerPattern: /^(\w*)(?:\((.*)\))?: (.*)$/,
+    headerCorrespondence: ['type', 'scope', 'message'],
+};
+
+process.stderr.write(`
+> Be sure to have the latest git tags locally:
+    git fetch --tags
+
+`);
+
+const writerOpts = {
+    mainTemplate,
+    headerPartial,
+    commitPartial,
+    transform: (commit) => {
+        if (typeof commit.hash === 'string') {
+            commit.hash = commit.hash.substring(0, 7);
+        }
+
+        if (commit.type === 'test') {
+            commit.type = 'tests';
+        } else if (commit.type === 'cli') {
+            commit.type = 'CLI';
+        } else if (commit.type === 'new_feature' || commit.type === 'feat') {
+            commit.type = 'New Features';
+        }
+
+        if (commit.type) {
+            commit.type = commit.type.replace(/_/g, ' ');
+            commit.type = commit.type.substring(0, 1).toUpperCase() + commit.type.substring(1);
+        } else {
+            commit.type = 'Misc';
+        }
+
+        let pullRequestMatch = commit.header.match(pullRequestRegex);
+        // if header does not provide a PR we try the message
+        if (!pullRequestMatch && commit.message) {
+            pullRequestMatch = commit.message.match(pullRequestRegex);
+        }
+
+        if (pullRequestMatch) {
+            commit.header = commit.header.replace(pullRequestMatch[0], '').trim();
+            if (commit.message) {
+                commit.message = commit.message.replace(pullRequestMatch[0], '').trim();
+            }
+
+            commit.PR = pullRequestMatch[1];
+        }
+
+        return commit;
+    },
+    groupBy: 'type',
+    commitGroupsSort: (a, b) => {
+        // put new feature on the top
+        if (a.title === 'New Features') {
+            return -1;
+        }
+        if (b.title === 'New Features') {
+            return 1;
+        }
+
+        // put misc on the bottom
+        if (a.title === 'Misc') {
+            return 1;
+        }
+        if (b.title === 'Misc') {
+            return -1;
+        }
+
+        return a.title.localeCompare(b.title);
+    },
+    commitsSort: ['type', 'scope'],
+};
+
+module.exports = {
+    writerOpts,
+    parserOpts,
+};

build/changelog-generator/templates/commit.hbs

@@ -0,0 +1,28 @@
+{{!--
+/**
+ * @license Copyright 2017 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+ From: https://github.com/GoogleChrome/lighthouse/blob/master/build/changelog-generator/
+--}}
+* {{#if scope}}{{scope}}: {{/if~}}
+  {{#if message ~}}
+    {{~message~}}
+  {{~else~}}
+    {{~header~}}
+  {{~/if ~}}
+{{~!-- PR number/commit hash --}}
+{{~#if @root.linkReferences~}}
+  {{~#if PR}} ([#{{PR}}](
+      {{~#if @root.host}}{{~@root.host}}/{{/if~}}
+      {{~#if @root.owner ~}}{{@root.owner}}/{{/if~}}
+      {{~@root.repository}}/pull/{{PR}}))
+  {{~else}} ([{{hash}}](
+      {{~#if @root.host}}{{~@root.host}}/{{/if~}}
+      {{~#if @root.owner ~}}{{@root.owner}}/{{/if~}}
+      {{~@root.repository}}/{{@root.commit}}/{{hash}}))
+  {{~/if~}}
+{{~else~}}
+  {{~hash~}}
+{{~/if~}}

build/changelog-generator/templates/header.hbs

@@ -0,0 +1,13 @@
+{{!--
+/**
+ * @license Copyright 2017 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+  From: https://github.com/GoogleChrome/lighthouse/blob/master/build/changelog-generator/
+--}}
+ <a name="{{version}}"></a>
+# {{version}} ({{date}})
+{{#if @root.linkCompare~}}
+  [Full Changelog]({{~@root.repoUrl}}/compare/{{previousTag}}...{{currentTag}})
+{{~/if}}

build/changelog-generator/templates/template.hbs

@@ -0,0 +1,22 @@
+{{!--
+/**
+ * @license Copyright 2017 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+From: https://github.com/GoogleChrome/lighthouse/blob/master/build/changelog-generator/
+--}}
+{{> header}}
+
+{{#each commitGroups}}
+
+  {{#if title~}}
+  ## {{title}}
+
+  {{/if}}
+  {{#each commits}}
+    {{~> commit root=@root}}
+
+  {{/each}}
+{{/each}}
+

package.json

@@ -30,6 +30,7 @@
     "watch": "tsc --build --watch",
     "prepsuite": "node scripts/prepareSuite.js",
     "commit": "git-cz",
+    "changelog": "conventional-changelog --config ./build/changelog-generator/index.js --infile CHANGELOG.md --same-file",
     "lint:prettier": "prettier --list-different . \"!**/*.{js,ts}\" ",
     "lint:eslint": "eslint --cache --ext .js --ext .ts .",
     "lint": "yarn lint:eslint && yarn lint:prettier",
@@ -128,6 +129,7 @@
     "ts-jest": "^25.5.1",
     "typescript": "^3.9.7",
     "webpack": "^4.44.1",
-    "yeoman-test": "^2.7.0"
+    "yeoman-test": "^2.7.0",
+    "conventional-changelog-cli": "^2.1.0"
   }
 }