未フォローのフォロワーのリスト

gistfile1.gradle

@Grab('org.twitter4j:twitter4j-core:2.2.3')
import twitter4j.*
import twitter4j.conf.*

def conf = new ConfigurationBuilder()
  .setOAuthConsumerKey('consumer key')
  .setOAuthConsumerSecret('consumer secret')
  .setOAuthAccessToken('access token')
  .setOAuthAccessTokenSecret('access token secret')

new TwitterFactory(conf.build()).instance.with{
    def listId = it.createUserList('test', true, 'byGroovy').id
    def friends = it.getFriendsIDs(it.id, -1).IDs.toSet()
    it.getFollowersIDs(it.id, -1).IDs.findAll{
        !friends.contains(it)
    }.each{id ->
        it.addUserListMember(listId, id)
    }
}