name: go mod tidy

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - "*"

concurrency:
  group: ${{ github.workflow }}-$${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
  check:
    runs-on: ubuntu-latest

    steps:
      - name: Check out code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Set up Go
        uses: actions/setup-go@v3
        with:
          go-version-file: go.mod

      - name: check 'go mod tidy' is clean
        run: |
          ./tool/go mod tidy
          echo
          echo
          git diff --name-only --exit-code || (echo "Please run 'go mod tidy'."; exit 1)