prepare-release-pr.yml

name: Prepare release PR

on:
  push:
    branches:
      - main

permissions:
  contents: write
  pull-requests: write

jobs:
  prepare-release-pr:
    if: ${{ !startsWith(github.event.head_commit.message, 'chore(release):') }}
    runs-on: ubuntu-latest
    steps:
      - name: Check out sources
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 # Need full history for changelog

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            make \
            python3 python3-pip

      - name: Install git-cliff
        run: pip install git-cliff

      - name: Determine release version
        id: version
        run: |
          BASE_VERSION=$(cd source && make -B baseversion)
          DATE=$(TZ="America/Chicago" date +'%Y-%m-%d')

          git fetch --tags
          COUNT=$(git tag --list "${BASE_VERSION}.${DATE}*" | wc -l)
          if [ "$COUNT" -gt 0 ]; then
            VERSION="${BASE_VERSION}.${DATE}.$((COUNT+1))"
          else
            VERSION="${BASE_VERSION}.${DATE}"
          fi

          echo "$VERSION" > VERSION
          echo "version=$VERSION" >> $GITHUB_OUTPUT

      - name: Generate changelog
        run: |
          CHANGELOG_MD=true git cliff --config .github/cliff.toml \
            --tag ${{ steps.version.outputs.version }} \
            --output CHANGELOG.md

      - name: Generate release notes preview
        id: release_notes_preview
        run: |
          {
            echo 'release_notes<<EOF'
            git cliff --config .github/cliff.toml \
              --tag ${{ steps.version.outputs.version }} \
              --unreleased
            echo 'EOF'
          } >> $GITHUB_OUTPUT

      - name: Create or update release PR
        uses: peter-evans/create-pull-request@v6
        with:
          branch: release/next
          delete-branch: true
          commit-message: "chore(release): v${{ steps.version.outputs.version }}"
          title: "Release v${{ steps.version.outputs.version }}"
          body: >
            This PR was created by the [prepare-release-pr](/${{ github.repository }}/blob/main/.github/workflows/prepare-release-pr.yml)
            GitHub action. When you're ready to release, simply merge it — the corresponding GitHub release will be
            published automatically.


            If you're not ready yet, no problem. This PR will continue to update as you push changes to `main`,
            and you can merge it whenever you're ready.


            # Release notes

            ${{ steps.release_notes_preview.outputs.release_notes }}
          labels: release
          token: ${{ secrets.GITHUB_TOKEN }}