SBT: Override sbt run task in multi project build.sb

Question

I want to override the default behaviour of the run task in order to preprocess the arguments passed to the sbt command and call the run task on a specific subproject with different arguments (depending on custom logic). That's a sample of build.sbt file:

lazy val core = (project in file("core"))
lazy val bar = (project in file("bar"))
lazy val foo = (project in file("foo"))
run := Runner.buildRunTask(bar, foo).value.evaluated

The buildRunTask override the task with the new implementation. Here the code:

    def buildRunTask(runnableProjects:Project*) : Initialize[InputTask[Unit]] = 
    Def.inputTask { 
        val args: Seq[String] = spaceDelimited("<arg>").parsed
        val availableProjects = runnableProjects.map(_.id).mkString(",")
        if (args.length == 0) throw new IllegalStateException(s"you need to specify a valid command. Available commands are: '$availableProjects'")

        val command = args head
        val project = runnableProjects.find(_.id == command)
          .getOrElse(throw new IllegalStateException(s"invalid command '$command'. Available command are: $availableProjects"))

        val newArgs = transformArgs(args.rest)

        //TODO: how I can compile and execute the run task only for the project passed as argument? I want something like project.runTask(newArgs) ?
    }

Do you have any suggestion?

Thanks!

Regards

Gianluca