Use the pull request description as the commit message when merging with Squash and merge (refined-github#1312)

xiaoling · sindresorhus · commit 744e99a5912e · 2018-05-18T23:31:37.000+07:00
diff --git a/readme.md b/readme.md
@@ -102,6 +102,7 @@ GitHub Enterprise is also supported. More info in the options.
 - [View linked gists inline in comments.](https://user-images.githubusercontent.com/6978877/33911900-c62ee968-df8b-11e7-8685-506ffafc60b4.PNG)
 - [Search a user profile page when visiting it.](https://user-images.githubusercontent.com/1402241/35185441-24ad4b1e-fe37-11e7-9e1b-0dc09fc1ada2.png)
 - [Avoid opening duplicate issues thanks to the list of possibly-related issues.](https://user-images.githubusercontent.com/29176678/37566899-85953e6e-2abf-11e8-9f0e-52d18c87bbe3.gif)
+- [Use the pull request description as the commit message when merging with `Squash and merge`](https://github.com/sindresorhus/refined-github/issues/1322).
 
 ### More actions
 
diff --git a/source/content.js b/source/content.js
@@ -47,6 +47,7 @@ import addMilestoneNavigation from './features/add-milestone-navigation';
 import addFilterCommentsByYou from './features/add-filter-comments-by-you';
 import removeProjectsTab from './features/remove-projects-tab';
 import fixSquashAndMergeTitle from './features/fix-squash-and-merge-title';
+import fixSquashAndMergeMessage from './features/fix-squash-and-merge-message';
 import addTitleToEmojis from './features/add-title-to-emojis';
 import sortMilestonesByClosestDueDate from './features/sort-milestones-by-closest-due-date';
 import openCIDetailsInNewTab from './features/open-ci-details-in-new-tab';
@@ -219,6 +220,7 @@ function ajaxedPagesHandler() {
 		enableFeature(scrollToTopOnCollapse);
 		enableFeature(addDeleteForkLink);
 		enableFeature(fixSquashAndMergeTitle);
+		enableFeature(fixSquashAndMergeMessage);
 		enableFeature(openCIDetailsInNewTab);
 		enableFeature(waitForBuild);
 		enableFeature(toggleAllThingsWithAlt);
diff --git a/source/features/fix-squash-and-merge-message.js b/source/features/fix-squash-and-merge-message.js
@@ -0,0 +1,13 @@
+import select from 'select-dom';
+
+export default function () {
+	const button = select('.merge-message .btn-group-squash [type=submit]');
+	if (!button) {
+		return;
+	}
+
+	button.addEventListener('click', () => {
+		const description = select('.comment-form-textarea[name=\'pull_request[body]\']').textContent;
+		select('#merge_message_field').value = description;
+	});
+}
