hls.yml

name: "Haskell Language Server works"
on:
  pull_request:
  push:
    branches:
      - main
 
permissions:
  contents: read
  
jobs:
  test-hls-works:
    runs-on: ubuntu-latest
    timeout-minutes: 60
    steps:
      - name: Check out repo
        uses: actions/checkout@v4
      - name: Install Nix with good defaults
        uses: input-output-hk/install-nix-action@v20
        with:
          extra_nix_config: |
            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
            substituters = https://cache.iog.io/ https://cache.nixos.org/
          nix_path: nixpkgs=channel:nixos-unstable 
      - name: Cachix install Nix
        uses: cachix/install-nix-action@v18
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - name: Open nix environment
        uses: rrbutani/use-nix-shell-action@v1
      - name: Update dependencies
        run: cabal update; cabal freeze
      - name: Obtain GHC version
        run: |
          echo "VERSION=$(ghc --version | grep -oE '[^ ]+$')" >> $GITHUB_OUTPUT
        id: ghc
      - name: Cache hie-bios and ghcide 
        uses: actions/cache@v3
        with:
          path: |
            /home/runner/.cache
          key: hls-cache-${{ runner.os }}-${{ steps.ghc.outputs.VERSION }}-${{ hashFiles('**/cabal.project.freeze') }}-${{ hashFiles('**/*.cabal', '**/cabal.project') }}
          restore-keys: |
            hls-cache-${{ runner.os }}-${{ steps.ghc.outputs.VERSION }}-${{ hashFiles('**/cabal.project.freeze') }}-
      - name: Test HLS works
        run: haskell-language-server