Make a git prompt in sbt!

README.md

1. Create ~/.sbt/0.13/plugins folder if it doesn't exist yet
2. Move 2 files to said plugins folder
3. reload sbt console and witness your git prompt

CustomShellPrompt.scala

import sbt._
import Keys._

// This lifted from https://github.com/mingchuno/aws-wrap/blob/master/project/CustomShellPrompt.scala
object CustomShellPrompt {

  val Branch = """refs/heads/(.*)\s""".r

  def gitBranchOrSha =
    (Process("git symbolic-ref HEAD") #|| Process("git rev-parse --short HEAD")).!! match {
      case Branch(name) => name
      case sha          => sha.stripLineEnd
    }

  val customPrompt = { state: State =>

    val extracted = Project.extract(state)
    import extracted._

    (name in currentRef get structure.data) map { name =>
      "[" + scala.Console.CYAN + name + scala.Console.RESET + "] " +
      scala.Console.BLUE + "git:(" +
      scala.Console.RED + gitBranchOrSha +
      scala.Console.BLUE + ")" +
      scala.Console.RESET + " $ "
    } getOrElse ("> ")

  }
}

ShellPrompt.scala

import sbt._
import Keys._

object ShellPrompt extends Plugin {
        override def settings = Seq(
                shellPrompt := CustomShellPrompt.customPrompt
        )
}