Get the Pull Request number from a git branch

get_pr_from_branch.rb

# frozen_string_literal: true

require "net/https"
require "uri"
require "json"

def find_pr(org, repo, branch)
  uri = URI("https://api.github.com/repos/#{org}/#{repo}/pulls?head=#{org}:#{branch}")
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true

  request = Net::HTTP::Get.new(uri.request_uri)
  request['Authorization'] = "token #{ENV['GITHUB_ACCESS_TOKEN']}"
  response = http.request(request)
  json = JSON.parse(response.body)
  if json.count == 1
    json.first["number"]
  else
    nil
  end
end