A simple node.js application to choose a random mutual follower

random-mutual-follower.coffee

Twit = require 'twit'
async = require 'async'
fs = require 'fs'
shuffle = require('knuth-shuffle').knuthShuffle

T = new Twit {
	consumer_key: ''
	consumer_secret: ''
	access_token: ''
	access_token_secret: ''
}

Array::chunk = (n) ->
		if !this.length
			return []

		return [ this.slice 0, n ].concat this.slice(n).chunk(n)

getIDs = (err, reply, callback) ->
	callback err, reply.ids

getFollowing = (callback) ->
	T.get 'friends/ids', count: 5000, (err, reply) ->
		getIDs err, reply, callback

getFollowers = (callback) ->
	T.get 'followers/ids', count: 5000, (err, reply) ->
		getIDs err, reply, callback

handleResults = (err, results) ->
	mutual = results[0].filter (n) ->
		return results[1].indexOf(n) != -1

	mutualFollowers = []

	handleChunk = (err, reply, callback) ->
		for user in reply
			mutualFollowers.push user

		callback err

	getChunk = (item, callback) ->
		T.post 'users/lookup', user_id: item.join(','), (err, reply) ->
			handleChunk err, reply, callback

	getRandomUser = ->
		output = []

		for user in mutualFollowers
			output.push user.screen_name

		console.log shuffle(output.slice(0))[Math.floor(Math.random())*output.length]

	async.eachLimit mutual.chunk(100), 5, getChunk, getRandomUser

async.series [
	getFollowers
	getFollowing
], handleResults