name: Documentation build

on:
  push:
    branches: [ master ]
    tags:
      - '*'
  pull_request:
    branches: [ master ]

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9"]

    steps:
    - uses: actions/checkout@v2
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install
      run: |
        python -m pip install cython
        python -m pip install --upgrade pip
        pip install .[doc]
    - name: Build docs
      run: |
        cd docs
        make html
    - name: Upload docs
      uses: actions/upload-artifact@v1
      with:
        name: docs
        path: docs/_build/html
    - name: Publish docs to Github Pages
      if: startsWith(github.event.ref, 'refs/tags')
      uses: JamesIves/github-pages-deploy-action@v4
      with:
        branch: gh-pages
        folder: docs/_build/html
