Skip the test when the current build SHA1 has a successful status flag associated (Github API)

build.sbt

import org.kohsuke.github.{GHCommitState, GHCommitStatus, GitHub}

name := "gitStatus"

version := "1.0"

scalaVersion := "2.11.8"

libraryDependencies += "org.scalatest" %% "scalatest" % "2.2.6" % "test"

val githubToken = taskKey[Option[String]]("Read github API token")
githubToken := sys.env.get("GITHUB_TOKEN")

val getSha1 = taskKey[Option[String]]("read GIT_SHA1 env variable")
getSha1 := sys.env.get("GIT_SHA1")

val githubRepo = taskKey[String]("Infer Github repo from remote.origin.url config setting")
githubRepo := {
  val url = "git config --get remote.origin.url"!!
  val Https = "https://github.com/(.*)\\.git".r
  val Ssh = "git@github.com:(.*)\\.git".r

  url match {
    case Https(rid) => rid
    case Ssh(rid) => rid
    case _ => sys.error(s"Cannot extract a Github repo id from remote.origin.url $url")
  }
}

val getBuildStatus = taskKey[Option[GHCommitStatus]]("Get current GIT_SHA build status")
getBuildStatus := {
  for {
    sha1 <- getSha1.value
    token <- githubToken.value
    repoId = githubRepo.value
    client = GitHub.connectUsingOAuth(token)
    repo = client.getRepository(repoId)
    status <- Option(repo.getLastCommitStatus(sha1))
  } yield status
}

val testUnlessGreen = taskKey[Unit]("run tests, unless this SHA has already built successfully on CI")
testUnlessGreen := getBuildStatus.flatMap {
  case Some(s) if s.getState == GHCommitState.SUCCESS => nop
  case _ => (test in Test).taskValue
}