def getLastCommitHash() {
  return sh(script: 'git log --no-merges -n1 --pretty=format:"%H" HEAD', returnStdout: true).trim()
}

def isReleaseTag(string) {
  return string ==~ /^v\d+.\d+.\d+(-\S+)?$/
}

def getLatestTag() {
  return sh(script: 'git describe --abbrev=0 --tags', returnStdout: true).trim()
}

def isCommitTaggedWithVersion() {
  def latestTag = getLatestTag()
  def isVersionTag = isReleaseTag(latestTag)

  if (!isVersionTag) {
    return false
  }

  def commitForLatestTag = sh(script: "git rev-list -n 1 ${latestTag}", returnStdout: true).trim()
  def lastCommit = getLastCommitHash()

  return commitForLatestTag == lastCommit
}

def isPublishable() {
  return (isMaster() || isPR()) && isCommitTaggedWithVersion()
}