Little scala script for calculating the dividends and withholdings for them for InteractiveBrokers platform

InteractiveBrokersDividends.scala

import java.nio.charset.StandardCharsets
import java.nio.file.{Files, Path, Paths}

case class Identifier(ticker: String, isin: String)

val DescriptionRe = """^(.+?)\s*\((.+?)\).*$""".r

def read(path: Path): Map[Identifier, Vector[BigDecimal]] = {
  val lines = Files.readAllLines(path, StandardCharsets.UTF_8)
  var map = Map.empty[Identifier, Vector[BigDecimal]].withDefaultValue(Vector.empty)
  lines.forEach { line =>
    val Vector(date, description, amountStr, _*) = line.split("\t").toVector
    val DescriptionRe(ticker, isin) = description
    val id = Identifier(ticker, isin)
    val amount = BigDecimal(amountStr)
    println(s"Read $id -> $amount")
    map = map.updated(id, map(id) :+ amount)
  }
  map
}

val dividends = read(Paths.get("e:\\2016-us-div.txt"))
val withholdings = read(Paths.get("e:\\2016-us-withhold.txt"))

(withholdings -- dividends.keys).foreach { what =>
  println(s"WTF withholding: $what")
}

dividends.toVector.sortBy(_._1.ticker).foreach { dividend =>
  val withheld = withholdings.getOrElse(dividend._1, Vector.empty).sum
  println(s"${dividend._1.ticker}\t${dividend._1.isin}\t${dividend._2.sum}\t$withheld")
}