name: CI

on:
  push:
    branches:
      - main 
    paths-ignore:
      - "**README.md"
      - ".gitignore"
      - "LICENSE"
  pull_request:
    branches:
      - main
    paths-ignore:
      - "**README.md"
      - ".gitignore"
      - "LICENSE"

jobs:
  build:
    name: Build
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v6
        with:
          submodules: recursive
      # Cache the Nim compiler built by nimbus-build-system (NBS).
      # Building Nim from source is the slowest part of `make update`.
      # Keyed on the NBS submodule commit — auto-invalidates when NBS is bumped.
      - id: nbs
        run: echo "hash=$(git rev-parse HEAD:vendor/nimbus-build-system)" >> $GITHUB_OUTPUT
      - uses: actions/cache@v4
        with:
          path: vendor/nimbus-build-system/vendor/Nim
          key: ${{ runner.os }}-nbs-${{ steps.nbs.outputs.hash }}
      - run: make update
      - run: make all

  test:
    name: Test
    needs: build
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v6
        with:
          submodules: recursive
      - id: nbs
        run: echo "hash=$(git rev-parse HEAD:vendor/nimbus-build-system)" >> $GITHUB_OUTPUT
      - uses: actions/cache@v4
        with:
          path: vendor/nimbus-build-system/vendor/Nim
          key: ${{ runner.os }}-nbs-${{ steps.nbs.outputs.hash }}
      - run: make update
      - run: make tests