release.yml

name: Release

on:
  workflow_dispatch:
    inputs:
      major-version:
        description: 'Major Version'
        required: true
        default: '9'
        type: choice
        options:
          - '9'
          - '10'

defaults:
  run:
    # Setting an explicit bash shell ensures GitHub Actions enables pipefail mode too, rather
    # than only error on exit. This is important for UX since this workflow uses pipes. See:
    # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsshell
    shell: bash

jobs:
  release:
    name: Release
    # Prevent accidentally performing a release from a branch other than `main`.
    if: github.ref == 'refs/heads/main'
    runs-on: pub-hk-ubuntu-22.04-small
    steps:
      - name: Get token for GH application (Linguist)
        uses: heroku/use-app-token-action@main
        id: generate-token
        with:
          app_id: ${{ vars.LINGUIST_GH_APP_ID }}
          private_key: ${{ secrets.LINGUIST_GH_PRIVATE_KEY }}

      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Using the GH application token here will configure the local git config for this repo with credentials
          # that can be used to make signed commits that are attributed to the GH application user
          token: ${{ steps.generate-token.outputs.app_token }}

      - name: Set up Java
        uses: actions/setup-java@v4
        with:
          distribution: 'zulu'
          java-version: '11'
          server-id: ossrh
          server-username: MAVEN_CENTRAL_USERNAME
          server-password: MAVEN_CENTRAL_TOKEN
          gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
          gpg-passphrase: MAVEN_GPG_PASSPHRASE

      - name: Record new version
        id: new-version
        run: echo "version=$(./mvnw org.apache.maven.plugins:maven-help-plugin:3.1.0:evaluate -Dexpression=project.version -q -B -DforceStdout)" >> "${GITHUB_OUTPUT}"
        working-directory: webapp-runner-${{ inputs.major-version }}

      - name: Check GitHub release does not already exist
        run: |
          if gh release view 'v${{ steps.new-version.outputs.version }}' --json url --jq '.url'; then
            echo "Aborting since a GitHub release already exists for ${{ steps.new-version.outputs.version }}!" >&2
            echo "If you are sure you want to recreate the release, delete the existing one first." >&2
            exit 1
          fi
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.app_token }}

      - name: Extract changelog entry
        id: changelog-entry
        # See https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
        run: |
          {
            echo 'content<<CHANGELOG_END'
            awk '/^## \[${{ steps.new-version.outputs.version }}\]/{flag=1; next} /^## /{flag=0} flag' webapp-runner-${{ inputs.major-version }}/CHANGELOG.md
            echo CHANGELOG_END
          } >> "${GITHUB_OUTPUT}"

      - name: Deploy project
        run: ./mvnw --batch-mode deploy
        working-directory: webapp-runner-${{ inputs.major-version }}
        env:
          MAVEN_CENTRAL_USERNAME: ${{ secrets.MAVEN_CENTRAL_USERNAME }}
          MAVEN_CENTRAL_TOKEN: ${{ secrets.MAVEN_CENTRAL_TOKEN }}
          MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2.0.4
        with:
          token: ${{ steps.generate-token.outputs.app_token }}
          tag_name: v${{ steps.new-version.outputs.version }}
          body: ${{ steps.changelog-entry.outputs.content }}

      - name: Record next version
        id: next-version
        run: echo "version=$(echo ${{ steps.new-version.outputs.version }} | awk -F. -v OFS=. '{ $NF=sprintf("%d-SNAPSHOT", ($NF+1)); printf $0 }')" >> "${GITHUB_OUTPUT}"

      - name: Update version
        run: ./mvnw versions:set -DgenerateBackupPoms=false -DnewVersion="${{ steps.next-version.outputs.version }}"
        working-directory: webapp-runner-${{ inputs.major-version }}

      - name: Create pull request
        id: pr
        uses: peter-evans/create-pull-request@v6.0.5
        with:
          token: ${{ steps.generate-token.outputs.app_token }}
          title: Prepare next development iteration ${{ steps.next-version.outputs.version }}
          body: |
            Prepare next development iteration `${{ steps.next-version.outputs.version }}`.
          commit-message: Prepare next development iteration ${{ steps.next-version.outputs.version }}
          branch: prepare-next
          delete-branch: true
          committer: ${{ vars.LINGUIST_GH_APP_USERNAME }} <${{ vars.LINGUIST_GH_APP_EMAIL }}>
          author: ${{ vars.LINGUIST_GH_APP_USERNAME }} <${{ vars.LINGUIST_GH_APP_EMAIL }}>
          labels: |
            skip changelog

      - name: Configure pull request
        if: steps.pr.outputs.pull-request-operation == 'created'
        run: gh pr merge --auto --squash "${{ steps.pr.outputs.pull-request-number }}"
        env:
          GH_TOKEN: ${{ steps.generate-token.outputs.app_token }}