class RuboCop::ConfigLoader

directories are inspected.
during a run of the rubocop program, if files in several
file from which it was read. Several different Configs can be used
and all its cops. A Config is associated with a YAML configuration
This class represents the configuration of the RuboCop application

def base_configs(path, inherit_from)

def base_configs(path, inherit_from)
  configs = Array(inherit_from).map do |f|
    f = File.join(File.dirname(path), f) unless f.start_with?('/')
    if auto_gen_config?
      next if f.include?(AUTO_GENERATED_FILE)
      old_auto_config_file_warning if f.include?('rubocop-todo.yml')
    end
    print 'Inheriting ' if debug?
    load_file(f)
  end
  configs.compact
end

def config_files_in_path(target)

def config_files_in_path(target)
  possible_config_files = dirs_to_search(target).map do |dir|
    File.join(dir, DOTFILE)
  end
  possible_config_files.select { |config_file| File.exist?(config_file) }
end

def configuration_file_for(target_dir)

there either, the path to the default file is returned.
user's home directory is checked. If there's no .rubocop.yml
inspected file is. If no .rubocop.yml is found there, the
directory structure starting at the given directory where the
Returns the path of .rubocop.yml searching upwards in the
def configuration_file_for(target_dir)
  config_files_in_path(target_dir).first || DEFAULT_FILE
end

def configuration_from_file(config_file)

def configuration_from_file(config_file)
  config = load_file(config_file)
  return config if config_file == DEFAULT_FILE
  found_files = config_files_in_path(config_file)
  if found_files.any? && found_files.last != config_file
    print 'AllCops/Exclude ' if debug?
    config.add_excludes_from_higher_level(load_file(found_files.last))
  end
  merge_with_default(config, config_file)
end

def default_configuration

def default_configuration
  @default_configuration ||= begin
                               print 'Default ' if debug?
                               load_file(DEFAULT_FILE)
                             end
end

def dirs_to_search(target_dir)

def dirs_to_search(target_dir)
  dirs_to_search = []
  Pathname.new(File.expand_path(target_dir)).ascend do |dir_pathname|
    break if dir_pathname.to_s == @root_level
    dirs_to_search << dir_pathname.to_s
  end
  dirs_to_search << Dir.home
end

def load_file(path)

def load_file(path)
  path = File.absolute_path(path)
  hash = YAML.load_file(path) || {}
  puts "configuration from #{path}" if debug?
  resolve_inheritance(path, hash)
  Array(hash.delete('require')).each { |r| require(r) }
  hash.delete('inherit_from')
  config = Config.new(hash, path)
  config.deprecation_check do |deprecation_message|
    warn("#{path} - #{deprecation_message}")
  end
  config.add_missing_namespaces
  config.warn_unless_valid
  config.make_excludes_absolute
  config
end

def merge(base_hash, derived_hash)

arguments, will also be merged. And so on.
with the addition that any value that is a hash, and occurs in both
Return a recursive merge of two hashes. That is, a normal hash merge,
def merge(base_hash, derived_hash)
  result = base_hash.merge(derived_hash)
  keys_appearing_in_both = base_hash.keys & derived_hash.keys
  keys_appearing_in_both.each do |key|
    next unless base_hash[key].is_a?(Hash)
    result[key] = merge(base_hash[key], derived_hash[key])
  end
  result
end

def merge_with_default(config, config_file)

def merge_with_default(config, config_file)
  Config.new(merge(default_configuration, config), config_file)
end

def old_auto_config_file_warning

def old_auto_config_file_warning
  warn 'Attention: rubocop-todo.yml has been renamed to ' \
       "#{AUTO_GENERATED_FILE}".color(:red)
  exit(1)
end

def resolve_inheritance(path, hash)

def resolve_inheritance(path, hash)
  base_configs(path, hash['inherit_from']).reverse_each do |base_config|
    base_config.each do |k, v|
      hash[k] = hash.key?(k) ? merge(v, hash[k]) : v if v.is_a?(Hash)
    end
  end
end