version.yml

name: Version handling

on:
  pull_request:
    types:
      - closed
    branches:
      - master

jobs:
  version-update:
    # This version does not run on self-opened PRs
    if: ${{ github.event.pull_request.merged == true && github.event.pull_request.user.login != 'github-actions[bot]' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout source code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      # Sets up Java version
      - name: Set up Java
        uses: actions/setup-java@v4
        with:
          distribution: 'adopt'
          java-package: jdk
          java-version: '8'
      # Semantic versioning
      - name: Semantic versioning
        id: versioning
        uses: paulhatch/semantic-version@v5.4.0
        with:
          tag_prefix: ""
        # A string which, if present in a git commit, indicates that a change represents a
        # major (breaking) change, supports regular expressions wrapped with '/'
          major_pattern: "(MAJOR)"
        # Same as above except indicating a minor change, supports regular expressions wrapped with '/'
          minor_pattern: "(MINOR)"
        # A string to determine the format of the version output
          version_format: "${major}.${minor}.${patch}"
      # Check, whether there is an existing branch "version_<version>" or an open PR "version_<version>" -> "master"
      # and store the results as environment variables
      - name: Check if branch and PR exist
        # The second command was copied from https://stackoverflow.com/questions/73812503/github-action-stop-the-action-if-pr-already-exists
        run: |
          echo VERSION_BRANCH_EXISTS=$(git ls-remote --heads origin refs/heads/version_${{ steps.versioning.outputs.version }} | wc -l) >> $GITHUB_ENV
          echo PR_EXISTS=$(gh pr list \
            --repo "$GITHUB_REPOSITORY" \
            --json baseRefName,headRefName \
            --jq '
              map(select(.baseRefName == "master" and .headRefName == "version_${{ steps.versioning.outputs.version }}"))
              | length
            ') >> $GITHUB_ENV
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        # If the branch "version_<version>" does not exist, create the branch and update the version in all files
      - name: Create branch and update PathExpression version
        if:  ${{ env.VERSION_BRANCH_EXISTS == '0' }}
        run: |
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          git config --global user.name "github-actions[bot]"
          git checkout -b version_${{ steps.versioning.outputs.version }}
          mvn build-helper:parse-version versions:set -DnewVersion=\${{ steps.versioning.outputs.version }} versions:commit
          git ls-files | grep 'pom.xml$' | xargs git add
          git commit --allow-empty -am "Update PathExpression version to ${{ steps.versioning.outputs.version }}"
          git push origin version_${{ steps.versioning.outputs.version }}
      # If a PR "version_<version>" -> "master" does not exist, create the PR
      - name: Open pull request for version update
        if: ${{ env.PR_EXISTS == '0' }}
        run: |
          gh pr create -B master -H version_${{ steps.versioning.outputs.version }} -t "Update PathExpression version to ${{ steps.versioning.outputs.version }}" -b "This PR was created by the version-update workflow. Please make sure to delete the branch after merging, otherwise future workflows might fail."
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  version-release:
    # This job runs only on merged PRs, which were opened by the version-update job
    if: ${{ github.event.pull_request.merged == true && github.event.pull_request.user.login == 'github-actions[bot]' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout source code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      # Semantic versioning
      - name: Semantic versioning
        id: versioning
        uses: paulhatch/semantic-version@v5.4.0
        with:
          tag_prefix: ""
        # A string which, if present in a git commit, indicates that a change represents a
        # major (breaking) change, supports regular expressions wrapped with '/'
          major_pattern: "(MAJOR)"
        # Same as above except indicating a minor change, supports regular expressions wrapped with '/'
          minor_pattern: "(MINOR)"
        # A string to determine the format of the version output
          version_format: "${major}.${minor}.${patch}"
      # Create a tag with the newest version to prepare a release
      - name: Create tag for new version
        run: |
          git config --global user.email "${{ github.actor }}@users.noreply.github.com"
          git config --global user.name "${{ github.actor }}"
          git tag -a ${{ steps.versioning.outputs.version }} -m "PathExpression version ${{ steps.versioning.outputs.version }}"
          git push origin ${{ steps.versioning.outputs.version }}