ci.yml

name: Go CI

on:
  pull_request:
  push:
    branches:
      - main
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: go-ci-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  format:
    name: format
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Set up Go
        uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
          cache: true

      - name: Verify gofmt on changed Go files
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            git fetch origin "${{ github.base_ref }}" --depth=1
            files="$(git diff --name-only --diff-filter=ACMRT "origin/${{ github.base_ref }}"...HEAD -- '*.go')"
          elif [ -n "${{ github.event.before }}" ] && [ "${{ github.event.before }}" != "0000000000000000000000000000000000000000" ]; then
            files="$(git diff --name-only --diff-filter=ACMRT "${{ github.event.before }}"...HEAD -- '*.go')"
          else
            files="$(git ls-files '*.go')"
          fi

          if [ -z "$files" ]; then
            echo "No Go files changed."
            exit 0
          fi

          unformatted="$(printf '%s\n' "$files" | xargs gofmt -l)"
          if [ -n "$unformatted" ]; then
            echo "These files need gofmt:"
            echo "$unformatted"
            exit 1
          fi

  test:
    name: test
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v6

      - name: Set up Go
        uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
          cache: true

      - name: Run tests
        run: go test ./...