name: Haskell CI

on: [push, pull_request]
jobs:
  build:
   
    runs-on: ${{ matrix.os }}

    env:
      hieref: 35f62cffb6bae6c3f86113cb0c55f52b7192689d

    strategy:
      matrix:
        ghc: ['8.6.5', '8.4.4']
        os: [ubuntu-latest, macOS-latest]
        exclude:
          - os: macOS-latest
            ghc: '8.4.4' # fails due to ghc panic

    steps:
    - uses: actions/checkout@v1
    - uses: bubba/setup-haskell@macos-ghcup
      with:
        ghc-version: ${{ matrix.ghc }}
        cabal-version: '3.0'
    - run: cabal update

    - name: Clone HIE
      uses: actions/checkout@v1
      with:
        repository: haskell/haskell-ide-engine
        submodules: recursive
        ref: ${{ env.hieref }}
        path: haskell-ide-engine

    - name: Cache Cabal
      uses: actions/cache@v1.1.0
      with:
        path: ~/.cabal
        key: ${{ runner.OS }}-${{ matrix.ghc }}-cabal-${{ env.hieref }}
        restore-keys: |
          ${{ runner.OS }}-${{ matrix.ghc }}-cabal

    - name: Cache Hoogle
      uses: actions/cache@v1.1.0
      with:
        path: ~/.hoogle
        key: ${{ runner.OS }}-${{ matrix.ghc }}-hoogle-${{ env.hieref }}

    - name: Build HIE
      run: |
        pushd ../haskell-ide-engine
        cabal install hie
        cabal install hoogle
        popd
    - name: Generate hoogle database
      run: |
        if [ -d $HOME/.hoogle ]; then
           echo "hoogle database already built"
           exit 0
        fi
        hoogle generate
    - name: Install JS Language Server
      run: npm install javascript-typescript-langserver
    - name: Build
      run: cabal build
    - name: Test
      run: |
        export PATH=$PATH:$(npm bin) 
        cabal test