name: Bazel CI

on:
  # Trigger the workflow on push or pull request,
  # but only for the master branch
  push:
    branches:
      - master
  pull_request: {}

jobs:
  build:
    name: Bazel
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'

    - uses: actions/cache@v2
      id: caching-stage
      name: Cache Bazel artifacts
      with:
        path: |
          .bazel-cache
          bin
        key: ${{ runner.os }}-bazel-${{ github.run_id }}
        restore-keys: |
          ${{ runner.os }}-bazel-

    - name: Download/cache bazel version
      if: steps.caching-stage.outputs.cache-hit != 'true'
      run: |
        if [ ! -f bin/bazel ]; then
          curl -LO "https://github.com/bazelbuild/bazel/releases/download/3.1.0/bazel-3.1.0-linux-x86_64"
          mv bazel-3.1.0-linux-x86_64 "bin/bazel"
          chmod +x "bin/bazel"
        fi

    - name: Build & test
      run: |
        bin/bazel clean
        bin/bazel test --config=ci --test_tag_filters=language-test //...
        bin/bazel test --config=ci //semantic-source //semantic:spec