feat: Add task that adds GitHub Actions workflow to automerge Dependa…

…bot pull requests

packages/mrm-preset-default/Readme.md

@@ -12,6 +12,7 @@ See [Mrm docs](https://mrm.js.org/docs/getting-started) for more details.
 
 - [codecov](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-codecov)
 - [contributing](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-contributing)
+- [dependabot](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-dependabot)
 - [editorconfig](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-editorconfig)
 - [eslint](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-eslint)
 - [gitignore](https://github.com/sapegin/mrm/tree/master/packages/mrm-task-gitignore)

packages/mrm-preset-default/dependabot/index.js

@@ -0,0 +1 @@
+module.exports = require('mrm-task-dependabot');

packages/mrm-preset-default/index.spec.js

@@ -10,6 +10,12 @@ it('should have contributing task', () => {
 	expect(task.description).toMatch('contributing');
 });
 
+it('should have dependabot task', () => {
+	const task = require('./dependabot/index.js');
+	expect(task).toEqual(expect.any(Function));
+	expect(task.description).toMatch('Dependabot');
+});
+
 it('should have editorconfig task', () => {
 	const task = require('./editorconfig/index.js');
 	expect(task).toEqual(expect.any(Function));

packages/mrm-task-dependabot/License.md

@@ -0,0 +1,9 @@
+# The MIT License
+
+Copyright 2020 Artem Sapegin (http://sapegin.me), contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

packages/mrm-task-dependabot/Readme.md

@@ -0,0 +1,38 @@
+<!-- Dependabot -->
+
+# mrm-task-dependabot
+
+[Mrm](https://github.com/sapegin/mrm) task that adds GitHub Actions workflow to automerge [Dependabot](https://dependabot.com/) pull requests.
+
+## What it does
+
+- Creates a workflow file
+
+## Usage
+
+```
+npm install -g mrm mrm-task-dependabot
+mrm dependabot
+```
+
+## Options
+
+See [Mrm docs](../../docs/Getting_started.md) for more details.
+
+### `workflowFile` (default: `.github/workflows/dependabot.yml`)
+
+Location of GitHub Actions workflow file
+
+## Changelog
+
+The changelog can be found in [CHANGELOG.md](CHANGELOG.md).
+
+## Contributing
+
+Everyone is welcome to contribute. Please take a moment to review the [contributing guidelines](../../Contributing.md).
+
+## Authors and license
+
+[Artem Sapegin](https://sapegin.me) and [contributors](https://github.com/sapegin/mrm/graphs/contributors).
+
+MIT License, see the included [License.md](License.md) file.

packages/mrm-task-dependabot/__snapshots__/index.spec.js.snap

@@ -0,0 +1,29 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`should add a workflow file 1`] = `
+Object {
+  "/.github/workflows/dependabot.yml": "name: Dependabot Automerge
+'on': pull_request
+jobs:
+  worker:
+    runs-on: ubuntu-latest
+    if: 'github.actor == ''dependabot[bot]'''
+    steps:
+      - uses: actions/github-script@v3
+        with:
+          script: |-
+            github.pulls.createReview({
+              owner: context.payload.repository.owner.login,
+              repo: context.payload.repository.name,
+              pull_number: context.payload.pull_request.number,
+              event: 'APPROVE'
+            })
+            github.pulls.merge({
+              owner: context.payload.repository.owner.login,
+              repo: context.payload.repository.name,
+              pull_number: context.payload.pull_request.number,
+              merge_method: 'squash'
+            })
+",
+}
+`;

packages/mrm-task-dependabot/index.js

@@ -0,0 +1,49 @@
+const { yaml } = require('mrm-core');
+
+module.exports = function task({ workflowFile }) {
+	// Create workflow file (no update)
+	const workflowYml = yaml(workflowFile);
+	if (!workflowYml.exists()) {
+		workflowYml
+			.merge({
+				name: 'Dependabot Automerge',
+				on: 'pull_request',
+				jobs: {
+					worker: {
+						'runs-on': 'ubuntu-latest',
+						if: "github.actor == 'dependabot[bot]'",
+						steps: [
+							{
+								uses: 'actions/github-script@v3',
+								with: {
+									script: `github.pulls.createReview({
+  owner: context.payload.repository.owner.login,
+  repo: context.payload.repository.name,
+  pull_number: context.payload.pull_request.number,
+  event: 'APPROVE'
+})
+github.pulls.merge({
+  owner: context.payload.repository.owner.login,
+  repo: context.payload.repository.name,
+  pull_number: context.payload.pull_request.number,
+  merge_method: 'squash'
+})`,
+								},
+							},
+						],
+					},
+				},
+			})
+			.save();
+	}
+};
+
+module.exports.description =
+	'Adds GitHub Actions workflow to automerge Dependabot pull requests';
+module.exports.parameters = {
+	workflowFile: {
+		type: 'input',
+		message: 'Enter location of GitHub Actions workflow file',
+		default: '.github/workflows/dependabot.yml',
+	},
+};

packages/mrm-task-dependabot/index.spec.js

@@ -0,0 +1,17 @@
+jest.mock('fs');
+jest.mock('git-username');
+jest.mock('mrm-core/src/util/log', () => ({
+	added: jest.fn(),
+}));
+
+const { getTaskOptions } = require('mrm');
+const vol = require('memfs').vol;
+const task = require('./index');
+
+afterEach(() => vol.reset());
+
+it('should add a workflow file', async () => {
+	task(await getTaskOptions(task));
+
+	expect(vol.toJSON()).toMatchSnapshot();
+});