on:
  push:
    paths:
      - "**.hs"
      - "**.nix"
      - "flake.lock"
      - "agora.cabal"
    branches:
      - master
  pull_request:
    paths:
      - "**.hs"
      - "**.nix"
      - "flake.lock"
      - "agora.cabal"
jobs:
  check-formatting:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - uses: actions/cache@v2.1.4
        name: Cache stack
        with:
          path: ~/.stack
          key: ${{ runner.os }}-stack-formatting
          restore-keys: ${{ runner.os }}-stack-

      - run: stack install fourmolu
        name: "Install fourmolu"

      - run: ./.github/format.sh
        name: "Run fourmolu"