name: Tests

on:
  push:
    branches-ignore:
      - auto-backport-of-pr-[0-9]+
      - v[0-9]+.[0-9]+.[0-9x]+-doc
  pull_request:

env:
  NO_AT_BRIDGE: 1  # Necessary for GTK3 interactive test.
  OPENBLAS_NUM_THREADS: 1
  PYTHONFAULTHANDLER: 1

jobs:
  test:
    name: "Python ${{ matrix.python-version }} on ${{ matrix.os }} ${{ matrix.name-suffix }}"
    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        include:
          - name-suffix: "(Minimum Versions)"
            os: ubuntu-16.04
            python-version: 3.6
            extra-requirements: '-c requirements/testing/minver.txt'
            delete-font-cache: true
            XVFB_RUN: xvfb-run -a
          - os: ubuntu-16.04
            python-version: 3.7
            extra-requirements: '-r requirements/testing/travis_extra.txt'
            XVFB_RUN: xvfb-run -a
            CFLAGS: "-fno-lto"  # Ensure that disabling LTO works.
          - os: ubuntu-16.04
            python-version: 3.8
            extra-requirements: '-r requirements/testing/travis_extra.txt'
            XVFB_RUN: xvfb-run -a
          - os: macos-latest
            python-version: 3.8
            XVFB_RUN: ""

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

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

      - name: Install OS dependencies
        run: |
          case "${{ runner.os }}" in
          Linux)
            sudo apt-get update -yy
            sudo apt-get install -yy \
              ccache \
              cm-super \
              dvipng \
              ffmpeg \
              gdb \
              gir1.2-gtk-3.0 \
              graphviz \
              inkscape \
              lcov \
              libcairo2 \
              libcairo2-dev \
              libffi-dev \
              libgeos-dev \
              libgirepository1.0-dev \
              libsdl2-2.0-0 \
              libxkbcommon-x11-0 \
              libxcb-icccm4 \
              libxcb-image0 \
              libxcb-keysyms1 \
              libxcb-randr0 \
              libxcb-render-util0 \
              libxcb-xinerama0 \
              lmodern \
              fonts-freefont-otf \
              texlive-pictures \
              pkg-config \
              qtbase5-dev \
              texlive-fonts-recommended \
              texlive-latex-base \
              texlive-latex-extra \
              texlive-latex-recommended \
              texlive-luatex \
              texlive-xetex \
              ttf-wqy-zenhei
            ;;
          macOS)
            brew install ccache
            ;;
          esac

      - name: Cache pip
        uses: actions/cache@v2
        if: startsWith(runner.os, 'Linux')
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-py${{ matrix.python-version }}-pip-${{ hashFiles('requirements/*/*.txt') }}
          restore-keys: |
            ${{ runner.os }}-py${{ matrix.python-version }}-pip-
      - name: Cache pip
        uses: actions/cache@v2
        if: startsWith(runner.os, 'macOS')
        with:
          path: ~/Library/Caches/pip
          key: ${{ runner.os }}-py${{ matrix.python-version }}-pip-${{ hashFiles('requirements/*/*.txt') }}
          restore-keys: |
            ${{ runner.os }}-py${{ matrix.python-version }}-pip-
      - name: Cache ccache
        uses: actions/cache@v2
        with:
          path: |
            ~/.ccache
          key: ${{ runner.os }}-py${{ matrix.python-version }}-ccache-${{ hashFiles('src/*') }}
          restore-keys: |
            ${{ runner.os }}-py${{ matrix.python-version }}-ccache-
      - name: Cache Matplotlib
        uses: actions/cache@v2
        with:
          path: |
            ~/.cache/matplotlib
            !~/.cache/matplotlib/tex.cache
            !~/.cache/matplotlib/test_cache
          key: ${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-
            ${{ runner.os }}-py${{ matrix.python-version }}-mpl-

      - name: Install Python dependencies
        run: |
          # Upgrade pip and setuptools and wheel to get as clean an install as
          # possible.
          python -mpip install --upgrade pip setuptools wheel

          # Install dependencies from PyPI.
          python -mpip install --upgrade $PRE \
            cycler kiwisolver numpy pillow pyparsing python-dateutil \
            -r requirements/testing/travis_all.txt \
            ${{ matrix.extra-requirements }}

          # Install optional dependencies from PyPI.
          # Sphinx is needed to run sphinxext tests
          python -mpip install --upgrade sphinx

          # GUI toolkits are pip-installable only for some versions of Python
          # so don't fail if we can't install them.  Make it easier to check
          # whether the install was successful by trying to import the toolkit
          # (sometimes, the install appears to be successful but shared
          # libraries cannot be loaded at runtime, so an actual import is a
          # better check).
          if [[ "${{ runner.os }}" != 'macOS' ]]; then
            # PyGObject, pycairo, and cariocffi do not install on OSX 10.12;
            # pycairo 1.20+ requires a new version of Cairo, unavailable on
            # Ubuntu 16.04, so PyGObject must be installed without build
            # isolation in order to pick up the lower pre-installed version.
             python -mpip install --upgrade 'pycairo<1.20.0' 'cairocffi>=0.8' &&
             python -mpip install --upgrade --no-build-isolation PyGObject &&
               python -c 'import gi; gi.require_version("Gtk", "3.0"); from gi.repository import Gtk' &&
               echo 'PyGObject is available' ||
               echo 'PyGObject is not available'

            # There are no functioning wheels available for OSX 10.12 (as of
            # Sept 2020) for either pyqt5 (there are only wheels for 10.13+) or
            # pyside2 (the latest version (5.13.2) with 10.12 wheels has a
            # fatal to us bug, it was fixed in 5.14.0 which has 10.13 wheels)
             python -mpip install --upgrade pyqt5 &&
               python -c 'import PyQt5.QtCore' &&
               echo 'PyQt5 is available' ||
               echo 'PyQt5 is not available'
             python -mpip install --upgrade pyside2 &&
               python -c 'import PySide2.QtCore' &&
               echo 'PySide2 is available' ||
               echo 'PySide2 is not available'
          fi
          python -mpip install --upgrade \
            -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 \
            wxPython &&
            python -c 'import wx' &&
            echo 'wxPython is available' ||
            echo 'wxPython is not available'

      - name: Install Matplotlib
        run: |
          ccache -s
          git describe

          # Set flag in a delayed manner to avoid issues with installing other
          # packages
          if [[ "${{ runner.os }}" != 'macOS' ]]; then
            export CPPFLAGS=--coverage
          fi

          # All dependencies must have been pre-installed, so that the minver
          # constraints are held.
          python -mpip install --no-deps -e .

          if [[ "${{ runner.os }}" != 'macOS' ]]; then
            unset CPPFLAGS
          fi

      - name: Clear font cache
        run: |
          rm -rf ~/.cache/matplotlib
        if: matrix.delete-font-cache

      - name: Run pytest
        run: |
          ${{ matrix.XVFB_RUN }} python -mpytest -raR -n auto \
            --maxfail=50 --timeout=300 --durations=25 \
            --cov-report= --cov=lib --log-level=DEBUG

      - name: Filter C coverage
        run: |
          lcov --capture --directory . --output-file coverage.info
          lcov --output-file coverage.info \
            --extract coverage.info $PWD/src/'*' $PWD/lib/'*'
          lcov --list coverage.info
          find . -name '*.gc*' -delete
        if: ${{ runner.os != 'macOS' }}
      - name: Upload code coverage
        uses: codecov/codecov-action@v1