brew/Library/Homebrew/cask/checkable.rb

module Cask
  module Checkable
    def errors
      @errors ||= []
    end

    def warnings
      @warnings ||= []
    end

    def add_error(message)
      errors << message
    end

    def add_warning(message)
      warnings << message
    end

    def errors?
      errors.any?
    end

    def warnings?
      warnings.any?
    end

    def result
      if errors?
        Formatter.error("failed")
      elsif warnings?
        Formatter.warning("warning")
      else
        Formatter.success("passed")
      end
    end

    def summary
      summary = ["#{summary_header}: #{result}"]

      errors.each do |error|
        summary << " #{Formatter.error("-")} #{error}"
      end

      warnings.each do |warning|
        summary << " #{Formatter.warning("-")} #{warning}"
      end

      summary.join("\n")
    end
  end
end