validate_yamllint.yml

---
name: Validate YAML (secondary files)

# yamllint disable-line rule:truthy
on:
  push:
    paths:
      - '**/*.yml'
      - '**/*.yaml'
  pull_request:
    paths:
      - '**/*.yml'
      - '**/*.yaml'
  workflow_dispatch:

jobs:
  code_scan:
    name: Validate YAML
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Ensures full commit history for diff

      - name: Identify changed files
        id: changed-files
        run: |
          BASE=${{ github.event.before }}
          HEAD=${{ github.sha }}
          FILES=$(git diff --name-only $BASE $HEAD -- '**/*.yml' '**/*.yaml' | tr '\n' ',')
          echo "changed_files=$FILES" >> $GITHUB_ENV
          if [[ -n "$FILES" ]]; then
            echo "any_changed=true" >> $GITHUB_ENV
          else
            echo "any_changed=false" >> $GITHUB_ENV
          fi

      - name: Validate YAML
        if: env.any_changed == 'true'
        run: |
          IFS=',' read -ra FILES <<< "${{ env.changed_files }}"
          for file in "${FILES[@]}"; do
            if [[ "$file" =~ ^.*\.yaml$ ]] || [[ "$file" =~ ^ESPHome/.*\.yaml$ ]]; then
              echo "Skipping $file"
              continue
            fi
            echo "::group::Validating $file"
            yamllint -c "./.rules/yamllint.yml" "$file"
            echo "::endgroup::"
          done
...