Check out pull requests from the command line

copr.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'json'
require 'net/https'
require 'fileutils'

def usage
  puts "usage: copr project_name id"
  puts "example: copr capybara-webkit 316"
  exit(1)
end

id = ARGV[0] || usage
project = File.basename(FileUtils.pwd)

http = Net::HTTP.new('api.github.com', 443)
http.use_ssl = true
url = "/repos/thoughtbot/#{project}/pulls/#{id}"
response = http.get(url)
data = JSON.parse(response.body)

git_url = data["head"]["repo"]["git_url"]
user = data["head"]["repo"]["owner"]["login"]
source_branch = data["head"]["ref"]
target_branch = source_branch == "master" ? user : source_branch

unless `git remote`.include?(user)
  `git remote add #{user} #{git_url}`
end
`git fetch #{user}`
`git checkout -b #{target_branch} #{user}/#{source_branch}`