name: CI

# Trigger the workflow on push or pull request, but only for the master branch
on:
  pull_request:
  push:
    branches: [master]

jobs:
  cabal:
    name: ${{ matrix.os }} / ghc ${{ matrix.ghc }}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest]
        cabal: ["3.4"]
        ghc:
          - "8.6.5"
          - "8.8.4"
          - "8.10.7"
          - "9.0.1"

    steps:
    - uses: actions/checkout@v2

    - uses: haskell/actions/setup@v1
      id: setup-haskell-cabal
      name: Setup Haskell
      with:
        ghc-version: ${{ matrix.ghc }}
        cabal-version: ${{ matrix.cabal }}

    - name: Freeze
      run: |
        cabal configure --enable-tests --enable-benchmarks --test-show-details=direct
        cabal freeze

    - uses: actions/cache@v2.1.3
      name: Cache ~/.cabal/store and dist-newstyle
      with:
        path: |
          ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
          dist-newstyle
        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}
        restore-keys: |
          ${{ runner.os }}-${{ matrix.ghc }}-

    - name: Configure
      run: |
        # Using separate store-dir because default one already has 'ghc-paths' package installed
        # with hardcoded path to ghcup's GHC path (which it was built with). This leads to failure in
        # doctest, as it tries to invoke that GHC, and it doesn't exist here.
        cabal --store-dir /tmp/cabal-store install --ignore-project -j2 doctest --constraint='doctest ^>=0.18'

    - name: Build
      run: |
        cabal build all

    - name: Test
      run: |
        cabal test all

    - name: Run doctests
      # doctests are broken on GHC 9 due to compiler bug:
      # https://gitlab.haskell.org/ghc/ghc/-/issues/19460
      continue-on-error: ${{ matrix.ghc == '9.0.1' }}
      run: |
        # Necessary for doctest to be found in $PATH
        export PATH="$HOME/.cabal/bin:$PATH"

        # Filter out base-compat-batteries from .ghc.environment.*, as its modules
        # conflict with those of base-compat.
        #
        # FIXME: This is an ugly hack. Ultimately, we'll want to use cabal-doctest
        # (or cabal v2-doctest, if it ever lands) to provide a clean GHC environment.
        # This might allow running doctests in GHCJS build as well.
        perl -i -e 'while (<ARGV>) { print unless /package-id\s+(base-compat-batteries)-\d+(\.\d+)*/; }' .ghc.environment.*

        (cd servant && doctest src)
        (cd servant-client && doctest src)
        (cd servant-client-core && doctest src)
        (cd servant-http-streams && doctest src)
        (cd servant-docs && doctest src)
        (cd servant-foreign && doctest src)
        (cd servant-server && doctest src)
        (cd servant-machines && doctest src)
        (cd servant-conduit && doctest src)
        (cd servant-pipes && doctest src)

  stack:
    name: stack / ghc ${{ matrix.ghc }}
    runs-on: ubuntu-latest
    strategy:
      matrix:
        stack: ["2.7.3"]
        ghc: ["8.10.4"]

    steps:
    - uses: actions/checkout@v2

    - uses: haskell/actions/setup@v1
      name: Setup Haskell Stack
      with:
        ghc-version: ${{ matrix.ghc }}
        stack-version: ${{ matrix.stack }}

    - uses: actions/cache@v2.1.3
      name: Cache ~/.stack
      with:
        path: ~/.stack
        key: ${{ runner.os }}-${{ matrix.ghc }}-stack

    - name: Install dependencies
      run: |
        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks --only-dependencies

    - name: Build
      run: |
        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks

    - name: Test
      run: |
        stack test --system-ghc

  ghcjs:
    name: ubuntu-latest / ghcjs 8.6
    runs-on: "ubuntu-latest"

    steps:
    - uses: actions/checkout@v2
    - uses: cachix/install-nix-action@v13
      with:
        extra_nix_config: |
          trusted-public-keys = ryantrinkle.com-1:JJiAKaRv9mWgpVAz8dwewnZe0AzzEAzPkagE9SP5NWI=1aba6f367982bd6dd78ec2fda75ab246a62d32c5 cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
          substituters = https://nixcache.reflex-frp.org https://cache.nixos.org/
    - name: Setup
      run: |
        # Override cabal.project with the lightweight GHCJS one
        cp cabal.ghcjs.project cabal.project
        cat cabal.project
        nix-shell ghcjs.nix --run "cabal v2-update && cabal v2-freeze"

    - uses: actions/cache@v2.1.3
      name: Cache ~/.cabal/store and dist-newstyle
      with:
        path: |
          ~/.cabal/store
          dist-newstyle
        key: ${{ runner.os }}-ghcjs8.6-${{ hashFiles('cabal.project.freeze') }}
        restore-keys: |
          ${{ runner.os }}-ghcjs8.6-

    - name: Build
      run: |
        nix-shell ghcjs.nix --run "cabal v2-build --ghcjs --enable-tests --enable-benchmarks all"

    - name: Tests
      run: |
        nix-shell ghcjs.nix --run ".github/run-ghcjs-tests.sh"