class RSpec::Core::ConfigurationOptions

def all_configs
  @all_configs ||= file_options << command_line_options << env_options
end

def args_from_options_file(path)
  return [] unless path && File.exist?(path)
  config_string = options_file_as_erb_string(path)
  config_string.split(/\n+/).map {|l| l.shellsplit}.flatten
end

def command_line_options
  @command_line_options ||= Parser.parse!(@args).merge :files_or_directories_to_run => @args
end

def configure(config)
  formatters = options.delete(:formatters)
  config.filter_manager = filter_manager
  order(options.keys, :libs, :requires, :default_path, :pattern).each do |key|
    force?(key) ? config.force(key => options[key]) : config.send("#{key}=", options[key])
  end
  formatters.each {|pair| config.add_formatter(*pair) } if formatters
end

def custom_options
  options_from(custom_options_file)
end

def custom_options_file
  command_line_options[:custom_options_file]
end

def drb_argv
  DrbOptions.new(options, filter_manager).options
end

def env_options
  ENV["SPEC_OPTS"] ? Parser.parse!(Shellwords.split(ENV["SPEC_OPTS"])) : {}
end

def extract_filters_from(*configs)
  configs.compact.each do |config|
    filter_manager.include config.delete(:inclusion_filter) if config.has_key?(:inclusion_filter)
    filter_manager.exclude config.delete(:exclusion_filter) if config.has_key?(:exclusion_filter)
  end
end

def file_options
  custom_options_file ? [custom_options] : [global_options, project_options, local_options]
end

def filter_manager
  @filter_manager ||= RSpec::configuration.filter_manager
end

def force?(key)
  !NON_FORCED_OPTIONS.include?(key)
end

def global_options
  @global_options ||= options_from(global_options_file)
end

def global_options_file
  begin
    File.join(File.expand_path("~"), ".rspec")
  rescue ArgumentError
    warn "Unable to find ~/.rspec because the HOME environment variable is not set"
    nil
  end
end

def initialize(args)
  @args = args
  if args.include?("--default_path")
    args[args.index("--default_path")] = "--default-path"
  end
  if args.include?("--line_number")
    args[args.index("--line_number")] = "--line-number"
  end
end

def local_options
  @local_options ||= options_from(local_options_file)
end

def local_options_file
  ".rspec-local"
end

def options_file_as_erb_string(path)
  ERB.new(File.read(path)).result(binding)
end

def options_from(path)
  Parser.parse(args_from_options_file(path))
end

def order(keys, *ordered)
  ordered.reverse.each do |key|
    keys.unshift(key) if keys.delete(key)
  end
  keys
end

def parse_options
  @options ||= extract_filters_from(*all_configs).inject do |merged, pending|
    merged.merge(pending) { |key, oldval, newval|
      MERGED_OPTIONS.include?(key) ? oldval + newval : newval
    }
  end
end

def project_options
  @project_options ||= options_from(project_options_file)
end

def project_options_file
  ".rspec"
end