text: class Metafiles
    # https://github.com/github/markup#markups
    EXTENSIONS = %w[
      .adoc .asc .asciidoc .creole .html .markdown .md .mdown .mediawiki .mkdn
      .org .pod .rdoc .rst .rtf .textile .txt .wiki
    ]
    BASENAMES = %w[
      about authors changelog changes copying copyright history license licence
      news notes notice readme todo
    ]
  
    def self.list?(file)
      return false if %w[.DS_Store INSTALL_RECEIPT.json].include?(file)
      !copy?(file)
    end
  
    def self.copy?(file)
      file = file.downcase
      ext  = File.extname(file)
      file = File.basename(file, ext) if EXTENSIONS.include?(ext)
      BASENAMES.include?(file)
    end
  end
  