class Xcodeproj::Command::ConfigDump

def dump_all_configs(configurable, name)
  path = Pathname(name)
  # Dump base configuration to file
  base_settings = extract_common_settings!(configurable.build_configurations)
  base_file_path = path + "#{name}_base.xcconfig"
  dump_config_to_file(base_settings, base_file_path)
  # Dump each configuration to file
  configurable.build_configurations.each do |config|
    settings = config.build_settings
    dump_config_to_file(settings, path + "#{name}_#{config.name.downcase}.xcconfig", [base_file_path])
  end
end

def dump_config_to_file(settings, file_path, includes = [])
  dir = @output_path + file_path + '..'
  dir.mkdir unless dir.exist?
  config = Config.new(settings)
  config.includes = includes
  config.save_as(@output_path + file_path)
end

def extract_common_settings!(build_configurations)
  # Grasp all common build settings
  all_build_settings = build_configurations.map(&:build_settings)
  common_build_settings = all_build_settings.reduce do |settings, config_build_settings|
    settings.select { |key, value| value == config_build_settings[key] }
  end
  # Remove all common build settings from each configuration specific build settings
  build_configurations.each do |config|
    config.build_settings.reject! { |key| !common_build_settings[key].nil? }
  end
  common_build_settings
end

def initialize(argv)
  self.xcodeproj_path = argv.shift_argument
  @output_path = Pathname(argv.shift_argument || '.')
  super
end

def run
  dump_all_configs(xcodeproj, 'Project')
  xcodeproj.targets.each do |target|
    dump_all_configs(target, target.name)
  end
end

def validate!
  super
  raise Informative, 'The output path must be a directory.' unless @output_path.directory?
  open_project!
end