ci.yml

name: CI
on:
  - push
  - pull_request

jobs:
  detect_languages:
    name: Select tests
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Find all languages
        run: |
          ls -d */ | egrep -v '^_' | tr -d / | sort > all_langs
          cp all_langs langs_to_test

      - name: Find changed languages
        if: github.event_name == 'pull_request' || github.ref != 'refs/heads/master'
        run: |
          before_ref=${{ github.event.pull_request.base.sha || 'origin/master' }}
          git diff --name-only $before_ref ${{ github.sha }} > changed_files

          if ! egrep -q '^(_test/.*|test|docker_test)$' changed_files; then
            git diff --name-only $before_ref ${{ github.sha }} |
              cut -f1 -d'/' |
              sort |
              uniq |
              comm -12 - all_langs > langs_to_test
          fi

      - name: Set job output
        id: set-job-output
        run: |
          jq -R -s -c 'split("\n") | map(select(length > 0))' < langs_to_test > langs_to_test.json
          echo "Languages to test: $(cat langs_to_test.json)"
          echo "::set-output name=languages::$(cat langs_to_test.json)"

    outputs:
      languages: ${{ steps.set-job-output.outputs.languages }}

  test:
    name: Test
    runs-on: ubuntu-latest
    needs: detect_languages
    if: ${{ needs.detect_languages.outputs.languages != '[]' }}
    strategy:
      fail-fast: false
      matrix:
        lang: ${{ fromJson(needs.detect_languages.outputs.languages) }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Run tests
        run: ./docker_test '${{ matrix.lang }}'
        timeout-minutes: 10