getVersionName and getVersionCode in gradle

def getVersionCode = { ->
  try {
    def code = new ByteArrayOutputStream()
    exec {
      commandLine 'git', 'rev-list', '--remotes'
      standardOutput = code
    }
    return code.toString().split("\n").size()
  }
  catch (ignored) {
    return -1;
  }
}

def getVersionName = { ->
  try {
    def stdout = new ByteArrayOutputStream()
    exec {
      commandLine './version.sh'
      standardOutput = stdout
    }
    return stdout.toString().trim()
  }
  catch (ignored) {
    return null;
  }
}