prepare-release-branch.yml

name: Prepare release branch

on:
  workflow_dispatch:
    inputs:
      version_part:
        description: The part of the version to update (Patch, Minor or Major)
        required: true
        type: choice
        options:
          - Patch
          - Minor
          - Major
        default: 'Minor'

jobs:
  prepare-branch:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Set up JDK 11
        uses: actions/setup-java@v3
        with:
          java-version: '11'
          distribution: 'adopt'
          cache: maven

      - name: Validate inputs
        run: |
          echo "INPUT_VERSION_PART: ${{ github.event.inputs.version_part }}"
          python -c "if '${{ github.event.inputs.version_part }}' not in ['Patch', 'Minor', 'Major']:   raise ValueError(\"'${{ github.event.inputs.version_part }}' must be one of ['Patch', 'Minor', 'Major'])\")"

      - name: Save current version
        id: save_current_version
        run: |
          mvn versions:set -DremoveSnapshot -DgenerateBackupPoms=false
          echo "::set-output name=current_version::$(mvn -B help:evaluate -Dexpression=project.version -q -DforceStdout)"

      - name: Update the CHANGELOG according to 'Keep a Changelog' guidelines
        uses: thomaseizinger/keep-a-changelog-new-release@v1
        with:
          version: ${{ steps.save_current_version.outputs.current_version }}

      - name: Create a new release branch
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com
          git commit -am "Bump CHANGELOG for release ${{ steps.save_current_version.outputs.current_version }}"
          git checkout -b release/${{ steps.save_current_version.outputs.current_version }}
          git push -u origin release/${{ steps.save_current_version.outputs.current_version }}

      - name: Bump development version
        run: |
          git checkout -b bump-version-after-${{ steps.save_current_version.outputs.current_version }}
          mvn validate -D 'bump${{ github.event.inputs.version_part }}' -DgenerateBackupPoms=false
          git commit -am "Bump development version to $(mvn -B help:evaluate -Dexpression=project.version -q -DforceStdout)"
          git push -u origin bump-version-after-${{ steps.save_current_version.outputs.current_version }}

      - name: Open a PR to bump development version to main
        id: open_pr
        uses: vsoch/pull-request-action@1.1.0
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PULL_REQUEST_BRANCH: main
          PULL_REQUEST_FROM_BRANCH: bump-version-after-${{ steps.save_current_version.outputs.current_version }}
          PULL_REQUEST_TITLE: "Bump development version after release of ${{ steps.save_current_version.outputs.current_version }}"
          PULL_REQUEST_BODY: "Bump SNAPSHOT version and CHANGELOG for subsequent development."