util.sc

def toCrLfOpt(content: Array[Byte]): Option[Array[Byte]] = {
  val cr = '\r'.toByte
  val lf = '\n'.toByte
  val indices = content
    .iterator
    .zipWithIndex
    .collect {
      case (`lf`, idx) if idx > 0 && content(idx - 1) != cr => idx
    }
    .toVector
  if (indices.isEmpty)
    None
  else {
    val updatedContent = Array.ofDim[Byte](content.length + indices.length)
    var i              = 0 // content index
    var j              = 0 // updatedContent index
    var n              = 0 // indices index
    while (n < indices.length) {
      val idx = indices(n)

      System.arraycopy(content, i, updatedContent, j, idx - i)
      j += idx - i
      i = idx

      updatedContent(j) = cr
      updatedContent(j + 1) = lf
      i += 1
      j += 2

      n += 1
    }

    val idx = content.length
    System.arraycopy(content, i, updatedContent, j, content.length - i)
    j += idx - i
    i = idx

    assert(i == content.length)
    assert(j == updatedContent.length)
    Some(updatedContent)
  }
}
def isArmArchitecture: Boolean =
  os.proc("uname", "-p").call(cwd = os.pwd).out.trim() == "arm"