Github branch watcher

github_watcher.rb

require 'open-uri'
require 'json'

class GithubWatcher
  ROOT_URL = 'https://api.github.com'
	TOKEN = '[API TOKEN]'

	def compareBranches
		branches = JSON.parse(open("#{ROOT_URL}/repos/[ORGANIZATION]/[REPO]/branches?access_token=#{TOKEN}").read)
		active_branches = branches.select{|b| !['master','uat','qa'].include?(b['name'])}
		comparisons = []

		master = branches.find{|b| b['name'] == 'master'}
		uat = branches.find{|b| b['name'] == 'uat'}
		qa = branches.find{|b| b['name'] == 'qa'}

		active_branches.each do |branch|
			masterComparison = compareBranch(master, branch)
			uatComparison = compareBranch(uat, branch)
			qaComparison = compareBranch(qa, branch)
			comparisons << {
				:name => branch['name'],
				:mergedIntoMaster => !masterComparison[:ahead],
				:mergedIntoUAT => !uatComparison[:ahead],
				:mergedIntoQA => !qaComparison[:ahead],
				:safeToMerge => !masterComparison[:behind]
			}
		end
		comparisons
	end

	def compareBranch(base, head)
		comparison = JSON.parse(open("#{ROOT_URL}/repos/[ORGANIZATION]/[REPO]/compare/#{base['commit']['sha']}...#{head['commit']['sha']}?access_token=#{TOKEN}").read)
		{
			:ahead => comparison['ahead_by'] > 0,
			:behind => comparison['behind_by'] > 0
		}
	end
end

index.html.haml

- @comparisons.each do |comp|
  .branch
		%h4= comp[:name]
		%ul
			%li= "Merged Into Master: #{comp[:mergedIntoMaster]}"
			- if !comp[:mergedIntoMaster]
				%a(href="https://github.com/[ORGANIZATION]/[REPO]/pull/new/[ORGANIZATION]:master...[ORGANIZATION]:#{comp[:name]}") Create Pull Request
			%li= "Merged Into UAT: #{comp[:mergedIntoUAT]}"
			- if !comp[:mergedIntoUAT]
				%a(href="https://github.com/[ORGANIZATION]/[REPO]/pull/new/[ORGANIZATION]:uat...[ORGANIZATION]:#{comp[:name]}") Create Pull Request
			%li= "Merged Into QA: #{comp[:mergedIntoQA]}"
			- if !comp[:mergedIntoQA]
				%a(href="https://github.com/[ORGANIZATION]/[REPO]/pull/new/[ORGANIZATION]:qa...[ORGANIZATION]:#{comp[:name]}") Create Pull Request

.merged_branches
	- @comparisons.each do |comp|
		- if comp[:mergedIntoMaster] && comp[:mergedIntoUAT] && comp[:mergedIntoQA]
			%span= ":#{comp[:name]} "

projects_controller.rb

class ProjectsController < ApplicationController
  def index
		@comparisons = GithubWatcher.new.compareBranches
	end
end