gistfile1.rb

## usage #####################################################################
#
#  patch-tester.rb <ticket_id>
#
#  specify which branches to test against below (TEST_BRANCHES)
#  creates <ticket_id>-<branch> branches with the latest patch on the ticket
#  applied

require 'open-uri'
require 'rexml/document'
require 'tempfile'
require 'net/https'

TICKET_FORMAT = 'http://rails.lighthouseapp.com/projects/8994/tickets/%s.xml'
TEST_BRANCHES = %w( master 2-3-stable )

def ticket(id)
  REXML::Document.new(open(TICKET_FORMAT % id))
end

def attachment(url)
  uri  = URI.parse(url)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.get(uri.path).body
end

def current_branch
  path = Dir.pwd
  until File.exists?(File.join(path, '.git', 'HEAD'))
    raise 'Can not find .git directory' if path == '/'
    path = File.dirname(path)
  end
end

unless ticket_id = ARGV.first
  puts "usage: #{File.basename(__FILE__)} <ticket_id>"
  exit 1
end

current_branch

attachment_url = ticket(ticket_id).elements['//attachment/url[last()]'].text
attachment_url.gsub!(/\Ahttp/, 'https')

patch_path = nil
Tempfile.open('rails-patch') do |temp|
  patch_path = temp.path
  temp.puts(attachment(attachment_url))
end

original_branch = current_branch

TEST_BRANCHES.each do |branch|
  test_branch = "#{ticket_id}-#{branch}"

  %x( git checkout #{branch} )
  %x( git checkout -b #{ticket_id}-#{branch} )
  %x( git am #{patch_path} ) if current_branch == test_branch
end

%x( git checkout #{original_branch} )