update_gems_with_tests.rake

namespace :bundle do

  def intersection
    return @outdated if @outdated
    @outdated = `bundle outdated`
    @outdated = @outdated.split("\n").select{|line| line.include?("*")}
    @outdated = @outdated.map{|gem| gem.match(/\* ([a-zA-Z0-9_-]+) /)[1]}

    app_gems = File.readlines("Gemfile").select{|line| line.include?("gem ")}
    app_gems = app_gems.map{|gem| gem.match(/gem '([a-zA-Z0-9_-]+)/)[1]}

    @outdated = @outdated.select{|outdated_gem| app_gems.include?(outdated_gem)}
  end

  desc "Update each gem in 'bundle outdated' if it also appears in the Gemfile and run rake after each update"
  task :update do
    if intersection.any?
      puts "Outdated gems that we depend on:\n#{intersection.join("\n")}\n"
      intersection.each do |gem|
        puts "Updating #{gem}"
        puts `bundle update #{gem}`
        puts `bundle exec rake`
        if $? == 0
          puts `git add Gemfile.lock`
          puts `git commit -m "update #{gem} gem"`
        else
          puts "The tests failed for gem: #{gem}"
          puts `git checkout Gemfile.lock`
        end
      end
    else
      puts "Nothing outdated."
    end
  end

  desc "Show the gems from 'bundle outdated' that also appear in the Gemfile"
  task :outdated do
    if intersection.any?
      puts "Outdated gems that we depend on:\n#{intersection.join("\n")}\n"
    else
      puts "Nothing outdated."
    end
  end
end