code: function rPath (htmlyFile, sourceFilepath) {
    htmlyFile = pathResolve(__dirname, htmlyFile)
    htmlyFile = pathRelative(dirname(sourceFilepath), htmlyFile)
    htmlyFile = slash(htmlyFile)
    if (!/^(\.|\/)/.test(htmlyFile)) {
      return './' + htmlyFile
    } else {
      return htmlyFile
    }
  }
docs: Generate a relative path to a htmly file, relative to source file
  
  @param {string} htmlyFile
  Path relative to current module
  
  @param {string} sourceFilepath
  The source filepath
  
  @return {string}
  A relative path to htmlyFile from a transformed source