class RSpec::Core::Formatters::Loader

def self.formatters
  @formatters ||= {}
end

def add(formatter_to_use, *paths)
  formatter_class = find_formatter(formatter_to_use)
  args = paths.map { |p| p.respond_to?(:puts) ? p : file_at(p) }
  if !Loader.formatters[formatter_class].nil?
    formatter = formatter_class.new(*args)
    @reporter.register_listener formatter, *notifications_for(formatter_class)
  elsif defined?(RSpec::LegacyFormatters)
    formatter = RSpec::LegacyFormatters.load_formatter formatter_class, *args
    @reporter.register_listener formatter, *formatter.notifications
  else
    line = ::RSpec::CallerFilter.first_non_rspec_line
    if line
      call_site = "Formatter added at: #{line}"
    else
      call_site = "The formatter was added via command line flag or your "+
                  "`.rspec` file."
    end
    RSpec.warn_deprecation <<-WARNING.gsub(/\s*\|/,' ')
      |The #{formatter_class} formatter uses the deprecated formatter
      |interface not supported directly by RSpec 3.
      |
      |To continue to use this formatter you must install the
      |`rspec-legacy_formatters` gem, which provides support
      |for legacy formatters or upgrade the formatter to a
      |compatible version.
      |
      |#{call_site}
    WARNING
    return
  end
  @formatters << formatter unless duplicate_formatter_exists?(formatter)
  formatter
end

def built_in_formatter(key)
  case key.to_s
  when 'd', 'doc', 'documentation'
    DocumentationFormatter
  when 'h', 'html'
    HtmlFormatter
  when 'p', 'progress'
    ProgressFormatter
  when 'j', 'json'
    JsonFormatter
  end
end

def custom_formatter(formatter_ref)
  if Class === formatter_ref
    formatter_ref
  elsif string_const?(formatter_ref)
    begin
      formatter_ref.gsub(/^::/,'').split('::').inject(Object) { |const,string| const.const_get string }
    rescue NameError
      require( path_for(formatter_ref) ) ? retry : raise
    end
  end
end

def duplicate_formatter_exists?(new_formatter)
  @formatters.any? do |formatter|
    formatter.class === new_formatter && formatter.output == new_formatter.output
  end
end

def existing_formatter_implements?(notification)
  @reporter.registered_listeners(notification).any?
end

def file_at(path)
  FileUtils.mkdir_p(File.dirname(path))
  File.new(path, 'w')
end

def find_formatter(formatter_to_use)
  built_in_formatter(formatter_to_use) ||
  custom_formatter(formatter_to_use)   ||
  (raise ArgumentError, "Formatter '#{formatter_to_use}' unknown - maybe you meant 'documentation' or 'progress'?.")
end

def initialize(reporter)
  @formatters = []
  @reporter = reporter
  self.default_formatter = 'progress'
end

def notifications_for(formatter_class)
  formatter_class.ancestors.inject(Set.new) do |notifications, klass|
    notifications + Loader.formatters.fetch(klass) { Set.new }
  end
end

def path_for(const_ref)
  underscore_with_fix_for_non_standard_rspec_naming(const_ref)
end

def setup_default(output_stream, deprecation_stream)
  if @formatters.empty?
    add default_formatter, output_stream
  end
  unless @formatters.any? { |formatter| DeprecationFormatter === formatter }
    add DeprecationFormatter, deprecation_stream, output_stream
  end
  if RSpec.configuration.profile_examples? && !existing_formatter_implements?(:dump_profile)
    add RSpec::Core::Formatters::ProfileFormatter, output_stream
  end
end

def string_const?(str)
  str.is_a?(String) && /\A[A-Z][a-zA-Z0-9_:]*\z/ =~ str
end

def underscore(camel_cased_word)
  word = camel_cased_word.to_s.dup
  word.gsub!(/::/, '/')
  word.gsub!(/([A-Z]+)([A-Z][a-z])/,'\1_\2')
  word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
  word.tr!("-", "_")
  word.downcase!
  word
end

def underscore_with_fix_for_non_standard_rspec_naming(string)
  underscore(string).sub(%r{(^|/)r_spec($|/)}, '\\1rspec\\2')
end