release.yml

name: Release

# CalVer tags (YYYY.MM.DD), e.g. 2026.03.23. Pushes to main build a prerelease snapshot.
on:
  push:
    tags:
      # Years 2000–2099, three dot-separated segments (matches CalVer release tags)
      - "20[0-9][0-9].*.*"
    branches:
      - main

permissions:
  contents: write

jobs:
  build:
    runs-on: blacksmith-4vcpu-ubuntu-2404
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Resolve version and release tag
        run: |
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            TAG="${GITHUB_REF_NAME}"
            if ! echo "$TAG" | grep -qE '^[12][0-9]{3}\.[0-9]{2}\.[0-9]{2}$'; then
              echo "::error::Release tag must be CalVer YYYY.MM.DD (e.g. 2026.03.23), got: $TAG"
              exit 1
            fi
            echo "VERSION=${TAG}" >> "$GITHUB_ENV"
            echo "RELEASE_TAG=${TAG}" >> "$GITHUB_ENV"
            echo "PRERELEASE=false" >> "$GITHUB_ENV"
          else
            DAY="$(date -u +'%Y.%m.%d')"
            SNAP="${DAY}.snapshot.${GITHUB_RUN_NUMBER}"
            echo "VERSION=${SNAP}" >> "$GITHUB_ENV"
            echo "RELEASE_TAG=${SNAP}" >> "$GITHUB_ENV"
            echo "PRERELEASE=true" >> "$GITHUB_ENV"
          fi

      - name: Set up JDK 21
        uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: 21

      - name: Grant execute permission for gradlew
        run: chmod +x gradlew

      - name: Set up Gradle
        uses: gradle/actions/setup-gradle@v4

      - name: Build jar
        run: ./gradlew build --no-daemon
        env:
          VERSION_OVERRIDE: ${{ env.VERSION }}

      - name: Create GitHub release and upload jar
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ env.RELEASE_TAG }}
          name: ${{ env.VERSION }}
          generate_release_notes: true
          prerelease: ${{ env.PRERELEASE == 'true' }}
          fail_on_unmatched_files: true
          files: build/libs/WorldEngine-*.jar
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}