Convert `Content-Type: multipart/form-data` to JSON format because I can't read the former

FormFieldsToJson.scala

object FormFieldsToJson extends App {

  if(args.length != 1) {
    println("Usage: FormDataParser <form data>")
    System.exit(1)
  }

  val fieldDelimiter = "----"
  val fieldNLines = 3
  val data = args(0)
  val nameRegex = """^.+name="(.+)"$""".r

  val rawFields = data
    .split('\n')
    .dropWhile(! _.startsWith(fieldDelimiter))
    .filter(! _.startsWith(fieldDelimiter))
    .grouped(fieldNLines)

  val fields = for {
    Array(one, two, three) <- rawFields
    fieldName = one match { case nameRegex(n) => n; case _ => "na" }
    fieldValue = two.trim + three
  } yield fieldName -> fieldValue

  val jsonFields = fields map { case (k,v) => s"""  "$k" : "$v"""" }
  val jsonDoc = s"{\n${jsonFields.mkString(",\n")}\n}"
  println(jsonDoc)
}

How to use.

Compile:

scalac FormFieldsToJson.scala

Get some data:

formdata='Content-Type: multipart/form-data; boundary=---------------------------189793011315685
Content-Length: 2147

-----------------------------189793011315685
Content-Disposition: form-data; name="SomeFormField"

ThatFieldValue
-----------------------------189793011315685
Content-Disposition: form-data; name="AnotherField"

AnotherValue

....

Run it:

scala FormFieldsToJson "$formdata"

Prints:

{
  "SomeFormField" : "ThatFieldValue",
  "AnotherField" : "AnotherValue"
}