PR-into-2022-2.yml

name: Merge and PR into 2022.2

run-name: Merge 2021.3 -> 2022.2
on:
  pull_request_target:
    types:
      - closed
    branches:
      - 'maintenance/mps20213'

jobs:
  merge-and-pr:
    # only trigger if it was actually merged
    if: github.event.pull_request.merged == true

    runs-on: ubuntu-latest
    steps:
      # checkout the target branch
      - name: Checkout 2022.2
        uses: actions/checkout@v3
        with:
          ref: 'maintenance/mps20222'
          fetch-depth: 0

      # actually merge from the previous branch
      - name: Perform merge from 2021.3 to 2022.2
        run: |
          # setup to allow to merge and commit
          git config user.name 'github-actions[bot]'
          git config user.email 'github-actions[bot]@users.noreply.github.com'
          
          # actual merge operation
          git merge --no-ff --message "Merge 2021.3 -> 2022.2" origin/maintenance/mps20213 -- || ( echo "Merge failed. Please merge manually!" ; exit 1 )

      # actually merge from the previous branch
      - name: Prepare environment variables for PR
        run: |
          NEW_TITLE='${{ github.event.pull_request.title }}'
          NEW_TITLE="${NEW_TITLE% (2021.2 -> 2021.3)} (2021.3 -> 2022.2)"

          echo "NEW_TITLE=$NEW_TITLE" >> $GITHUB_ENV

      # create a PR based on the merge
      - name: Create PR for MPS 2022.2
        uses: peter-evans/create-pull-request@v5
        with:
          branch: 'merge/mps20222'
          commit-message: Merge maintenance/mps20213 into maintenance/mps20222
          title: ${{ env.NEW_TITLE }}
          body: |
            This is an automatic PR which merges changes from `maintenance/mps20213` to `maintenance/mps20222`
            
            [Link to previous PR for `maintenance/mps20213`](${{ github.event.pull_request._links.html.href }})