ci.yml

name: CI

on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

jobs:
  test:
    name: Test & Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Verify formatting
        run: |
          unformatted=$(gofmt -l .)
          if [ -n "$unformatted" ]; then
            echo "These files are not gofmt-formatted:"
            echo "$unformatted"
            exit 1
          fi

      - name: Vet
        run: go vet ./...

      - name: Test (race + coverage)
        run: go test -race -coverprofile=coverage.out -covermode=atomic ./...

      - name: Coverage summary
        run: go tool cover -func=coverage.out | tail -n 1

  lint:
    name: golangci-lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: golangci-lint
        # v9 supports golangci-lint v2 (correct /v2 module path for goinstall).
        uses: golangci/golangci-lint-action@v9
        with:
          # Pinned for reproducible runs — bump deliberately, not on every push.
          version: v2.12.2
          # Build golangci-lint with the repo's Go toolchain so it can analyze
          # the targeted Go version (prebuilt binaries lag behind new releases).
          install-mode: goinstall