def asset_files
      if @simple_page
        []
      else
        Dir.foreach(@file_path).collect { |file|
          is_asset = \
            file &&
            file !~ /\.#{PAGE_SUFFIXES_RE}$/ &&
            file !~ /^#{VAR_FILE_MATCH_RE}$/ &&
            !File.directory?(File.join(@file_path, file))
          file if is_asset
        }.compact
      end
    end
def asset_files
      if @simple_page
        []
      else
        Dir.foreach(@file_path).collect { |file|
          is_asset = \
            file &&
            file !~ /\.#{PAGE_SUFFIXES_RE}$/ &&
            file !~ /^#{VAR_FILE_MATCH_RE}$/ &&
            !File.directory?(File.join(@file_path, file))
          file if is_asset
        }.compact
      end
    end
returns an array of files in the folder that corresponds to this page
 that are not other pages. in other words, the assets in this folder

 file paths are relative to @file_path