gistfile1.rb

def xcode_proj_name
  File.basename(Dir.glob("*.xcodeproj").first, ".xcodeproj")
end

desc "Reset Xcode's autocompletion"
task :reset_xcode do
  home_folder = File.expand_path("~")
  project_name = xcode_proj_name
  Dir.glob("#{home_folder}/Library/Developer/Xcode/DerivedData/#{project_name}*").each do |folder_path|
    puts "Deleting #{folder_path}"
    FileUtils.remove_dir(folder_path, true)
  end
end