name: CI

on:
  push:
    branches:
      - master
    paths-ignore:
      - 'demo/**'
      - 'docker/**'
      - 'Dockerfile'
      - '.dockerignore'
      - '.ghci'
      - '.gitignore'
      - 'images/**'
      - 'notebooks/**'
      - 'README.md'
      - 'hie.yaml'
      - '*.nix'
  pull_request:
    paths-ignore:
      - 'demo/**'
      - 'docker/**'
      - 'Dockerfile'
      - '.dockerignore'
      - '.ghci'
      - '.gitignore'
      - 'images/**'
      - 'notebooks/**'
      - 'README.md'
      - 'hie.yaml'
      - '*.nix'

jobs:
  linux:
    runs-on: ubuntu-18.04
    strategy:
      fail-fast: false
      matrix:
        versions:
          - stack-yaml: 'stack-8.0.yaml'
          - stack-yaml: 'stack-8.2.yaml'
          - stack-yaml: 'stack-8.4.yaml'
          - stack-yaml: 'stack-8.6.yaml'
          - stack-yaml: 'stack-8.8.yaml'
          - stack-yaml: 'stack.yaml'

    steps:
      - uses: actions/checkout@v2
      - name: Cache .stack
        uses: actions/cache@v2.1.6
        with:
          path: ~/.stack/snapshots
          key: ${{ runner.os }}-${{ matrix.versions.stack-yaml }}-${{ hashFiles(format('./{0}', matrix.versions.stack-yaml)) }}
          restore-keys: |
            ${{ runner.os }}-${{ matrix.versions.stack-yaml }}
      - name: Update system dependencies
        run: |
          sudo apt update
      - name: Install system dependencies
        run: |
          sudo apt install libmagic-dev libgmp-dev libblas-dev liblapack-dev libcairo2-dev libpango1.0-dev libzmq3-dev jq
      - name: Set up Python
        uses: actions/setup-python@v1
        with:
          python-version: '3.8'
      - name: Install Python dependencies
        run: |
          python -m pip install --upgrade pip setuptools wheel
          pip install -r requirements.txt
      - name: Install Stack
        run: |
          export PATH=$HOME/.local/bin:$PATH
          mkdir -p ~/.local/bin
          curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
      - name: Build dependencies
        run: |
          # Used to avoid 'source and destination file are the same' error
          mv ${{ matrix.versions.stack-yaml }} intermediate-stack.yaml
          mv intermediate-stack.yaml stack.yaml

          echo "apply-ghc-options: everything" >> stack.yaml

          stack setup
          stack install gtk2hs-buildtools
          stack build hmatrix
          stack build --dependencies-only
      - name: Run Haskell tests
        run: |
          set -e
          stack build ipython-kernel --flag ipython-kernel:examples
          stack test ihaskell --no-terminal
      - name: Run integration test
        # The test is flaky on GHC 8.0 so we don't run it. As long as the tests
        # above pass, it's unlikely that we'll introduce a bug that we will
        # only catch through the integration test on this version and not other
        # versions.
        if: ${{ matrix.versions.stack-yaml != 'stack-8.0.yaml' }}
        run: |
          set -e
          stack build --no-terminal
          # Ensure that IHaskell notebook remains unchanged.
          # Run the notebook to regenerate the outputs, then compare the new notebook to the old one.
          stack install
          stack exec -- ihaskell install --stack
          test/acceptance.nbconvert.sh stack exec -- jupyter nbconvert