name: Validate README Code Examples

on:
  pull_request:
    branches: [ main ]
    paths:
      - 'pyTransition/examples/**'
      - 'pyTransition/README.md'
      - '.github/workflows/readme.yml'
      - 'pyTransition/readme-examples-config.yaml'
      - 'pyTransition/code-to-readme.py'
  push:
    branches: [ main ]
    paths:
      - 'pyTransition/examples/**'
      - 'pyTransition/README.md'
      - '.github/workflows/readme.yml'
      - 'pyTransition/readme-examples-config.yaml'
      - 'pyTransition/code-to-readme.py'

jobs:
  check-readme:
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Set up Python
      uses: actions/setup-python@v5
      with:
        python-version: '3.11'
        
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install pyyaml
        
    - name: Create temporary README copy
      run: cp README.md README.md.orig
      working-directory: ./pyTransition
        
    - name: Update README
      run: python code-to-readme.py --readme README.md --config readme-examples-config.yaml
      working-directory: ./pyTransition
      
    - name: Check if README was modified
      working-directory: ./pyTransition
      run: |
        if ! diff -q README.md README.md.orig >/dev/null 2>&1; then
          echo "README.md is out of sync with source code"
          echo "diff:"
          diff README.md README.md.orig || true
          exit 1
        else
          echo "README.md is up to date"
        fi