whos_not_following.rb

# frozen_string_literal: true

require 'octokit'

def configure
  Octokit.configure do |c|
    c.auto_paginate = true
  end
end

# @param [String] login
# @return [Array]
def followers(login)
  Octokit.followers(login).map(&:login)
end

# @param [String] login
# @return [Array]
def following(login)
  Octokit.following(login).map(&:login)
end

# @param [String] login
# @return [Array]
def whos_not_following(login)
  following(login) - followers(login)
end

configure

login = 'your_github_username'
puts whos_not_following(login).join(', ')