It will post on Facebook about the new companies opened to your branch for internship on Channeli. Needs IITR intranet.

Gemfile

source 'http://rubygems.org'
ruby "2.2.3"

# following gems are required in the main script.
gem "koala", "~> 2.2"
gem "httparty"
gem "nokogiri"

tpo-notice-on-facebook.rb

# 160217

# to make http requests
require 'httparty'
# to parse html response
require 'nokogiri'
# to post on facebook wall using GraphAPI
require 'koala'
# to parse the json data
require 'json'

# getting details from Channeli
# to get your CHANNELI_SESSID, login to Channeli and check cookies
# since you can only apply to the companies opened for your branch, this script will post only about them.
CHANNELI_SESSID = '<chenneli-sessid>'
BASE_URI = 'https://channeli.in'

print "Connecting to Channeli..."

@response = HTTParty.get(BASE_URI + '/internship/company/list',	cookies: {
	'CHANNELI_SESSID': CHANNELI_SESSID
})

puts "#{@response.code} #{@response.message}"
# puts @response.headers.inspect

if @response.code == 200

	print "Connected. Fetching data..."
	
	# lets dig into HTML response
	html = Nokogiri::HTML(@response.body)
	rows = html.search('table#t1 tbody').children.search('tr')

	data = Hash.new
	data[:company_count] = rows.length
	data[:company_name] = Array.new
	data[:last_date] = Array.new
	data[:pre_posted] = Array.new

	# check if data is already posted
	if File.exist?('tpo_data.json')
		data_file = JSON.parse(File.read('tpo_data.json'))
		pre_posted = data_file['company_name']
	else
		pre_posted = Array.new
	end

	# counting only new companies opened
	new_companies = data[:company_count] - pre_posted.length
	company = new_companies == 1 ? 'company' : 'companies'

	rows.each_with_index do |row, i|
		data[:company_name] << row.children.search('td')[1].content.strip
		data[:last_date] << row.children.search('td')[2].content.strip
		if pre_posted.include?(data[:company_name][i])
			data[:pre_posted] << true
		else
			data[:pre_posted] << false
		end
	end

	puts "Done. Total #{data[:company_count]} #{company} found."

	# posting on facebook
	if data[:pre_posted].include?(false)
		print "Posting on Facebook about #{new_companies} new #{company}..."
		# follow these instructions to get access token for two months http://stackoverflow.com/questions/17197970/facebook-permanent-page-access-token
		access_token = '<access-token>'
		# this facebook user will be used to post the content, so make sure it don't have friends from outside the campus.

		# creating post
		post = "#{new_companies} new #{company} opened for us:\r\n"
		serial_no = 1
		data[:company_count].times do |i|
			unless data[:pre_posted][i]
				post += "- #{data[:company_name][i]} (Last Date: #{data[:last_date][i]})\r\n"
				serial_no += 1
			end
		end
		post += "Hurry up!!\r\nhttps://channeli.in#notices"

		# using koala gem to post
		@graph = Koala::Facebook::API.new(access_token)
		@graph.put_wall_post(post)

		puts "Done."

		# save it in a json file
		print "saving data to json file..."

		File.open('tpo_data.json', 'w') do |f|
			f.write(data.to_json)
		end
		
	else
		puts "No new company arrived. Nothing to post on Facebook."
	end

	puts "Done."

else
	puts "Error: Cannot not connect to Channeli!"
end