SBT shell prompt respecting -Dsbt.nologformat

ShellPrompt.scala

import sbt._
import Keys._


// source of the actual shell modification take from Daniel C. Sobral's gist:
// https://gist.github.com/996474

// prompt looks like:
// $PROJECTNAME:$GITBRANCH>
object ShellPrompt extends Plugin {
  object devnull extends ProcessLogger {
    def info(s: => String) {}
    def error(s: => String) { }
    def buffer[T](f: => T): T = f
  }
  val current = """\*\s+(\w+)""".r
  def gitBranches = ("git branch --no-color" lines_! devnull mkString)
  
  def prompt(name: String) = 
    "%s:%s> " format (name,
      current findFirstMatchIn gitBranches map (_.group(1)) getOrElse "-"
    )

  override def settings: Seq[Setting[_]] = 
    if (System.getProperty("sbt.nologformat", "false") != "true") 
      Seq[Setting[_]](
        shellPrompt <<= name(name => { state: State => prompt(name) })
      )
    else 
      Seq()
}

// vim: set ts=4 sw=4 et: