With a few :sparkle: of Ruby idiomatic expression:

```ruby
jekyll_artifacts = %w[ _config.yml _drafts _includes _layouts _posts ]
unless jekyll_artifacts.any? { |artifact| File.exists?(artifact) }
  print "This doesn’t look like a Jekyll site. Are you sure you want to run joke? [y/N]: "
  unless gets.downcase.chomp == "y"
    abort "No worries. Later!"
  end
end
```
end
```