global build.sbt with git branch but no special unicode

build.sbt

import java.io.{ByteArrayOutputStream, PrintWriter}
import sbt.{ProcessBuilder, ProcessLogger}

def runCommand(cmd: Seq[String]): (Int, String, String) = {
  val stdout = new ByteArrayOutputStream
  val stderr = new ByteArrayOutputStream
  val stdoutWriter = new PrintWriter(stdout)
  val stderrWriter = new PrintWriter(stderr)

  val exitValue = cmd.!(new ProcessLogger {
    def info (s: => String) { stdoutWriter.print(s) }
    def error (s: => String) { stderrWriter.print(s) }
    def buffer[T] (f: => T): T = f
  })

  stdoutWriter.close()
  stderrWriter.close()
  (exitValue, stdout.toString, stderr.toString)
}

def gitBranch = {
  runCommand("git rev-parse --abbrev-ref HEAD".split(" ").toSeq) match {
    case (exit, _, _)  if(exit != 0)  => "No-Git"
    case (_, stdout, _)               => stdout
  }
}

shellPrompt := { state =>
  def textColor(color: Int)      = { s"\033[38;5;${color}m" }
  def backgroundColor(color:Int) = { s"\033[48;5;${color}m" }
  def reset                      = { s"\033[0m" }

  def formatText(str: String)(txtColor: Int, backColor: Int) = {
    s"${textColor(txtColor)}${backgroundColor(backColor)}${str}${reset}"
  }
  val red    = 1
  val green  = 2
  val yellow = 11
  val white  = 15
  val black  = 16
  val orange = 166

  formatText(s"[${name.value}]")(white, orange) +
  formatText(s" $gitBranch ")(black, yellow) +
   "\n " +
   formatText(">>> ")(orange, black)
}