name: CI

on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

jobs:
  test:
    name: ${{ matrix.name }}
    runs-on: ${{ matrix.os }}
    timeout-minutes: 30
    strategy:
      fail-fast: false
      matrix:
        include:
          - { name: macOS, os: macos-latest, skip: "" }
          # Snapshot goldens exist only for darwin; see docs/compat.md.
          - { name: Linux, os: ubuntu-latest, skip: "-skip Snapshot" }
          - { name: Windows, os: windows-latest, skip: "-skip Snapshot" }
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
      - name: Format
        if: runner.os == 'Linux'
        run: test -z "$(gofmt -l .)" || { gofmt -l .; exit 1; }
      - name: Build and vet every platform
        if: runner.os == 'Linux'
        run: |
          for os in darwin linux windows; do
            GOOS=$os go build ./...
            GOOS=$os go vet ./...
          done
      - name: Staticcheck
        if: runner.os == 'Linux'
        run: go run honnef.co/go/tools/cmd/staticcheck@v0.8.1 ./...
      - name: Test
        run: go test ${{ matrix.skip }} ./...
      - name: Race
        if: runner.os != 'Windows'
        run: go test -race ${{ matrix.skip }} ./...
      - name: Examples compile
        run: go build ./examples/...
      - name: Upload snapshot diffs
        if: failure()
        uses: actions/upload-artifact@v5
        with:
          name: snapshot-diffs-${{ matrix.name }}
          path: testdata/snapshots/**/*.got.png
          if-no-files-found: ignore