name: Nix

on: [pull_request]
jobs:
  nix:
    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        ghc: ['default', 'ghc8102', 'ghc884', 'ghc865']
        os: [ubuntu-latest, macOS-latest]

    steps:
    - uses: actions/checkout@v2
    - uses: cachix/install-nix-action@v12
      with:
        nix_path: nixpkgs=channel:nixos-20.03
    - uses: cachix/cachix-action@v7
      with:
        name: haskell-ghcide
        signingKey: '${{ secrets.GHCIDE_CACHIX_SIGNING_KEY }}'
    - run: nix-shell --argstr compiler ${{ matrix.ghc }} --run "cabal update && cabal build"