name: build

on:
  # Trigger the workflow on push to main or any pull request
  push:
    branches:
      - main
  pull_request:

jobs:
  build:

    strategy:
      max-parallel: 4
      matrix:
        platform: [ubuntu-latest, macos-latest]
        python-version: [3.8, 3.9]

    runs-on: ${{ matrix.platform }}

    steps:
    - uses: actions/checkout@v2

    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}

    - name: Conditionally install pytorch
      if: matrix.platform == 'windows-latest'
      run: pip3 install torch -f https://download.pytorch.org/whl/torch_stable.html

    - name: Install locally
      run: |
        python -m pip install --upgrade pip
        git submodule update --init --recursive
        python -m pip install .

    - name: Check installation
      working-directory: /tmp
      run: python $GITHUB_WORKSPACE/scripts/check_installation.py

    - name: Install optional test requirements
      run: |
        python -m pip install '.[dev,docs]'
        python -m pip install iopath transformers pyarrow
        python -m pip install git+https://github.com/facebookresearch/fairscale.git@main
        python -m pip install pygit2 pgzip
        
    - name: Install xformers for Macos
      if: matrix.platform == 'macos-latest'
      run: |
        brew install llvm libomp
        CC=/usr/local/opt/llvm/bin/clang CXX=clang++ pip install git+https://github.com/facebookresearch/xformers.git@main

    - name: Install xformers for non-MacOS
      if: matrix.platform != 'macos-latest'
      run: |
        python -m pip install --progress-bar off git+https://github.com/facebookresearch/xformers.git@main

    - name: Lint with black
      run: black --check --diff .

    - name: Lint with flake8
      run: |
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

    - name: Build doc
      run: make singlehtml
      working-directory: docs/

    - name: Run tests
      # When installing in non-editable mode, the .so files will be generated in 'site-packages/fairseq'.
      # But by default, pytest import machinery will load local fairseq, and won't see the .so.
      # Use --import-mode=append to favorize the 'site-packages/fairseq'.
      # https://docs.pytest.org/en/7.1.x/explanation/pythonpath.html
      run: pytest --import-mode=append -vvv tests/