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: [3.6, 3.7]

    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 setup.py build_ext --inplace
        python -m pip install --editable .

    - name: Install optional test requirements
      run: |
        python -m pip install iopath transformers pyarrow
        python -m pip install git+https://github.com/facebookresearch/fairscale.git@main

    - name: Lint with flake8
      run: |
        pip install flake8
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --extend-exclude fairseq/model_parallel/megatron
        # 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 --extend-exclude fairseq/model_parallel/megatron

    - name: Run tests
      run: |
          python setup.py test