action.yml

name: Automatically Merge Pull Request
description: >
  Merges the current pull request automatically if the "merge-and-resolve-jira-issue-if-checks-succeed" or
  "merge-if-checks-succeed" label is present.

inputs:
  merge-method:
    required: false
    default: merge
    description: >
      The merge strategy to be used. See the API documentation for "merge_method" for applicable values:
      https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#merge-a-pull-request

runs:
  using: composite
  steps:
    - name: Setup Scripts
      shell: pwsh
      run: |
        (Resolve-Path '${{ github.action_path }}/../../../Scripts').Path >> $Env:GITHUB_PATH

    - name: Check Mergeability
      id: check-mergeability
      # Fork PR runs won't have permissions to remove labels, nor do we want to allow auto-merging them.
      if: github.event.pull_request.head.repo.fork == false
      uses: Lombiq/GitHub-Actions/.github/actions/check-pull-request-labels@issue/OSOE-1308
      with:
        label1: merge-if-checks-succeed
        label2: merge-and-resolve-jira-issue-if-checks-succeed

    - name: Merge Pull Request
      if: steps.check-mergeability.outputs.contains-label == 'true'
      shell: pwsh
      run: |
        $url = '/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/merge'
        gh api --method PUT $url --raw-field merge_method='${{ inputs.merge-method }}'

    - name: Remove Label
      if: steps.check-mergeability.outputs.contains-label == 'true'
      uses: Lombiq/GitHub-Actions/.github/actions/add-remove-label@issue/OSOE-1308
      with:
        token: ${{ env.GITHUB_TOKEN }}
        labels: merge-if-checks-succeed
        type: remove