dynver

dynver.sbt

// sbt.version = 0.13.9

lazy val dynver = taskKey[String]("Determine the dynamic version")
dynver := {
  // Inspired by Mercurial's own self-versioning:
  //   http://www.selenic.com/hg/file/61b333b982ea/setup.py#l184
  // Outputs either:
  // * v1.0.0                     (if building on v1.0.0 tag, w/o local changes)
  // * v1.0.0+20140707            (if building on v1.0.0 tag with local changes)
  // * v1.0.0+3-1234abcd          (if building on commit 1234abcd: 3 commits after v1.0.0 tag, w/o local changes)
  // * v1.0.0+3-1234abcd+20140707 (if building on commit 1234abcd: 3 commits after v1.0.0 tag with local changes)
  // * 1234abcd                   (if building & there are no tags, on commit 1234abcd, w/o local changes)
  // * 1234abcd+20140707          (if building & there are no tags, on commit 1234abcd with local changes)
  val tstamp = "%1$tY%1$tm%1$td" format new java.util.Date
  val v = ("git describe --abbrev=8 --always --dirty=+" + tstamp).!!.init
  v.replaceAll("-([0-9]+)-g([0-9a-f]{8})", "+$1-$2")
}