module ViewComponent::PreviewActions

def find_preview
  candidates = []
  params[:path].to_s.scan(%r{/|$}) { candidates << Regexp.last_match.pre_match }
  preview = candidates.sort_by(&:length).reverse_each.detect { |candidate| ViewComponent::Preview.exists?(candidate) }
  if preview
    @preview = ViewComponent::Preview.find(preview)
  else
    raise AbstractController::ActionNotFound, "Component preview '#{params[:path]}' not found."
  end
end