j2objc_integrate_source.rb

# assuming your project is called 'MyProject' and the xcodeproj file is inside a folder
# called 'MyProject' and is called 'MyProject.xcodeproj', and that j2objc generated source
# is output into the 'MyProject/generated_src', this script will integrate the generated 
# source code and add all .m and .swift files to the project's main target

# use at your own risk... dont shout at me if this breaks your project, 
# turns your hair blue or kills your dog...

require 'xcodeproj'

class XcodeFileManager

  def self.process
    Dir.chdir("MyProject")
    add_group("MyProject.xcodeproj", "generated_src")
    Dir.chdir("..")
  end
  
  private

  def self.add_files(dir, group, main_target, changed = false)
      Dir.glob(dir) do |item|

          next if %w{. .DS_Store}.include?(item)
          next if group.children.map { |f| f.name }.include? File.basename(item)
          
          if File.directory?(item)
              new_folder = File.basename(item)
              created_group = group.new_group(new_folder)
              changed = add_files("#{item}/*", created_group, main_target, changed)
          else 
            i = group.new_file(item)
            changed = true
            if %w{.swift .m}.any? {|ext| item.end_with?(ext)}
              main_target.add_file_references([i])
            end
          end
      end
      
      changed
  end

  def self.add_group(project_path, folder)
  	project = Xcodeproj::Project.open(project_path)
    
  	generated_group = project.main_group[folder] || project.main_group.new_group(folder)
    
  	if add_files("#{folder}/*", generated_group, project.targets.first)
      project.save
    end
  end
    
end