Append PR number to merge commit message

[hwhsu1231]

Feature Request

When merging a pull request on the GitHub web client, the suggested commit message (at least in the case of a squash commit, which we always use) will automatically include the number of the PR in parentheses, like so:

Update project files (#123)

However, when merging using this GitHub Action, the first line of the commit message will look like this:

Update project files

No matter what option of MERGE_COMMIT_MESSAGE I choose:

• automatic
• pull-request-title
• pull-request-description
• pull-request-title-and-description

Therefore, I hope that it can append (#NUM) to the first line of the commit message for all possible options.

Versions

Current latest release: v0.16.2

[hwhsu1231]

Related to this part?

automerge-action/lib/merge.js

Lines 376 to 392 in 58724c9

	function getCommitMessage(mergeCommitMessage, pullRequest) {
	if (mergeCommitMessage === "automatic") {
	return undefined;
	} else if (mergeCommitMessage === "pull-request-title") {
	return pullRequest.title;
	} else if (mergeCommitMessage === "pull-request-description") {
	return pullRequest.body;
	} else if (mergeCommitMessage === "pull-request-title-and-description") {
	return (
	pullRequest.title + (pullRequest.body ? "\n\n" + pullRequest.body : "")
	);
	} else {
	return mergeCommitMessage.replace(PR_PROPERTY, (_, prProp) =>
	resolvePath(pullRequest, prProp)
	);
	}
	}

[hwhsu1231]

Hello, @pascalgn

I think the current alternative to appending PR number is to customize the commit message ourselves. For example, if I want to append a PR number to "pull-request-title" option of MERGE_COMMIT_MESSAGE, I can write it like this:

{pullRequest.title} (#{pullRequest.number})

The full example may look like this:

- name: Automerge a PR with 'automerge' label
  id: automerge
  uses: "pascalgn/automerge-action@v0.16.2"
  env:
    GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
    MERGE_METHOD: 'squash'
    MERGE_COMMIT_MESSAGE: '{pullRequest.title} (#{pullRequest.number})'
    UPDATE_METHOD: 'rebase'

But I hope that this GitHub Action can append (#PR) to the title of message by default. Can you fix this issue by appending (#PR) for all the options of MERGE_COMMIT_MESSAGE?