build.yml

name: Build
on: [push, pull_request]

# variables:
#   scalafmt_version: 'foo'
#   graalvm_version: 'bar'
#
# ^^^ This format from Azure Dev Pipelines doesnt seem to be supported yet with
# globally defining variables at top level of file :sadface:.
#
# TODO: eliminate hardcoded values once global vars are supported.

jobs:
  # We currently use docker hub automated builds for reproducibility -- but those
  # are so very very slow, so do a GHA build as well (that we don't push
  # anywhere), just so we see failures in the Dockerfile in CI without waiting
  # forever for DockerHub status (which also doesn't report back via GH checks).
  build-docker:
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/checkout@master
      - run: docker build -t mrothy/scalafmt-native .
      - run: docker images

  # Build native binaries for specific platforms
  build-native:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [macOS-10.14, ubuntu-18.04]
        include:
          - os: ubuntu-18.04
            graalvm_platform: linux-amd64
            graalvm_bin_path: bin
            graalvm_extra_params: "--static"
          - os: macOS-10.14
            graalvm_platform: darwin-amd64
            graalvm_bin_path: Contents/Home/bin

    steps:
      - name: Download GraalVM
        env:
          VERSION: "19.3.0"
          JAVA_MAJOR: "java8"
          PLATFORM: ${{ matrix.graalvm_platform }}
        run: |
          curl -fsL https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-${VERSION}/graalvm-ce-${JAVA_MAJOR}-${PLATFORM}-${VERSION}.tar.gz \
            --output graalvm.tgz
          tar xzf graalvm.tgz && rm -rf graalvm.tgz
          sudo mv graalvm-ce-${JAVA_MAJOR}-${VERSION} /usr/local/graalvm

      - name: Install GraalVM native-image plugin
        env:
          BIN_PATH: /usr/local/graalvm/${{ matrix.graalvm_bin_path }}
        run: ${BIN_PATH}/gu install native-image

      - name: Install Coursier
        run: |
          curl -s -Lo coursier https://git.io/coursier-cli && \
          chmod +x ./coursier && \
          sudo mv ./coursier /usr/local/bin/coursier

      - name: Fetch scalafmt classes
        env:
          SCALAFMT_VERSION: "2.3.2"
        run: |
          coursier fetch org.scalameta:scalafmt-cli_2.12:${SCALAFMT_VERSION} -p > .classpath

      - name: Build scalafmt with assembly into JAR
        env:
          BIN_PATH: /usr/local/graalvm/${{ matrix.graalvm_bin_path }}
          GRAALVM_EXTRA_PARAMS: ${{ matrix.graalvm_extra_params }}
          JAVA_OPTS: "-Xmx=2g"
        run: |
          export CLASSPATH=$(<.classpath) && \
          ${BIN_PATH}/native-image \
          ${GRAALVM_EXTRA_PARAMS} \
          --no-fallback \
          --report-unsupported-elements-at-runtime \
          --initialize-at-build-time \
          --allow-incomplete-classpath \
          --class-path $CLASSPATH org.scalafmt.cli.Cli \
          scalafmt-native

      - name: Create archive
        env:
          ARTIFACT: scalafmt-native_${{ matrix.graalvm_platform }}.tgz
        run: tar -cvzf ${ARTIFACT} ./scalafmt-native

      - uses: actions/upload-artifact@v1
        with:
          path: scalafmt-native_${{ matrix.graalvm_platform }}.tgz
          name: scalafmt-native_${{ matrix.graalvm_platform }}

  # Collate artifacts, upload to GitHub Releases on semver tags
  releaser:
    needs: [build-native]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/download-artifact@v1
        with:
          name: scalafmt-native_darwin-amd64
          path: .
      - uses: actions/download-artifact@v1
        with:
          name: scalafmt-native_linux-amd64
          path: .
      - run: ls -lh
      # TODO: generate changelog? or just handle via https://github.com/mroth/bump
      - name: Release to GitHub
        if: startsWith(github.ref, 'refs/tags/v')
        uses: softprops/action-gh-release@v1
        with:
          files: "scalafmt*.tgz"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}