on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  lint:
    name: Lint YAML files
    runs-on: docker
    container:
      image: mafyuh/node-yamllint:v1.0.0
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Get modified YAML files
        id: get_changed_files
        run: |
          CHANGED_FILES=$(git diff --name-only HEAD^ HEAD | grep -E '\.(yml)$' || true)
          echo "CHANGED_FILES=$CHANGED_FILES" >> $GITHUB_ENV          

      - name: Run yamllint on modified files
        if: env.CHANGED_FILES != ''
        run: |
          yamllint $CHANGED_FILES          
        env:
          CHANGED_FILES: ${{ env.CHANGED_FILES }}

      - name: Skip linting if no YAML files are changed
        if: env.CHANGED_FILES == ''
        run: echo "No YAML files changed in this PR. Skipping lint."