name: README Check
on:
  workflow_dispatch:  
  pull_request:
    paths:
      - 'internal/readme/**'
      - 'README.md'
  
permissions:
  contents: read

jobs:
  readme-check:
    runs-on: ubuntu-latest
    steps:
    - name: Set up Go
      uses: actions/setup-go@v5
    - name: Check out code
      uses: actions/checkout@v4
    - name: Check README is up-to-date
      run: |
        go generate ./internal/readme
        if [ -n "$(git status --porcelain)" ]; then
          echo "ERROR: README.md is not up-to-date!"
          echo ""
          echo "The README.md file differs from what would be generated by `go generate ./internal/readme`."
          echo "Please update internal/readme/README.src.md instead of README.md directly,"
          echo "then run `go generate ./internal/readme` to regenerate README.md."
          echo ""
          echo "Changes:"
          git status --porcelain
          echo ""
          echo "Diff:"
          git diff
          exit 1
        fi
        echo "README.md is up-to-date"