module.exports.contentAsText = async function(doc, rootLevel) {
  const { level, next, line, head } = doc
  const linesAsArray = []

  let contentDepth = -1

  while(await next(rootLevel)) {
    if (contentDepth === -1 && !!line()) contentDepth = level()

    const indent = ''.padStart(level() - contentDepth, ' ')
    linesAsArray.push(indent + line())
  }

  return linesAsArray.join('\n')
}