How to change a version setting inside a single command?

[Rogach]

In short, I want to have a command ("publish-snapshot"), which would run a "publish" task with modified "version" setting (that setting is to be computed at the time of execution of the command).

I figured out how to get current value of the version inside command, and Project.runTask(<task>, <scope>, ...) seems to be a right call for invoking that publish task.

The only thing that I'm confused with is how to modify the State instance with a new version value. All my attempts seem to do nothing to the original version setting. I posted my latest attempt - http://pastebin.com/DAGfMQEa .

Is there some way to fix that behavior?

[Jason Zaugg]

Take a look at the sources of the sbt-release plugin [1] which does just this.

-jason

[1]  https://github.com/sbt/sbt-release

[Kevin Scaldeferri]

We do something like this (some details elided):

  override lazy val projectSettings = 

     ...

      Seq(commands += stampVersion) ++

      addCommandAlias("publish-integration", ";stamp-version ;publish")

  def stampVersion = Command.command("stamp-version") { state =>

    val extracted = Project.extract(state)

    extracted.append(List(version in ThisBuild ~= { ver =>

      val stmp = stamp(ver)

      Logging.info("Stamping version %s".format(stmp))

      stmp

    }), state)

  }

  def stamp(version: String): String = {

    // whatever you want

  }

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[Rogach]

Thanks a lot! Now it works flawlessly.