ci.yml

name: CI

on:
  push:
    branches: ["main"]
  pull_request:
    branches: ["main"]

jobs:
  checks:
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v24

      - name: Nix Format Check
        run: nix fmt -- . --check

      - name: Nix Syntax Check
        run: nix flake check

  build-plan:
    # Save some computation. If the checks fail, don't build.
    needs: checks
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - name: checkout
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v24

      - name: Generate Build Matrix
        id: set-matrix
        run: |
          matrix="$(nix eval --json .#githubActions.matrix)"
          echo "matrix=$matrix" >> $GITHUB_OUTPUT

  build:
    needs: build-plan
    runs-on: ${{ matrix.os }}
    strategy:
      matrix: ${{fromJSON(needs.build-plan.outputs.matrix)}}
    steps:
      - name: checkout
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v24

      - name: Setup Cache
        uses: ryanccn/attic-action@f75ac4b827cc5ce58fbf5d56a958db7aee78879c
        with:
          endpoint: https://hercules.servers.lowrisc.org/nix-cache/
          cache: public
          token: ${{ secrets.NIX_CACHE_TOKEN }}

      - name: Build ${{ matrix.attr }}
        run: nix build ".#{{ matrix.attr }}"