class RuboCop::RSpec::ConfigFormatter

def cops
  (descriptions.keys | config.keys).grep(EXTENSION_ROOT_DEPARTMENT)
end

def dump
  YAML.dump(unified_config)
    .gsub(%r{^\w+/}, "\n\\0")   # Add an extra newline before each cop.
    .gsub(/^(\s+)- /, '\1  - ') # Add 2 spaces before each array element.
    .gsub('"~"', '~')           # Don't quote tilde, YAML's null value.
end

def initialize(config, descriptions)
  @config       = config
  @descriptions = descriptions
end

def reference(cop)
  COP_DOC_BASE_URL + cop
end

def replace_nil(config)
  config.each do |key, value|
    config[key] = '~' if value.nil?
  end
end

def unified_config
  cops.each_with_object(config.dup) do |cop, unified|
    replace_nil(unified[cop])
    unified[cop].merge!(descriptions.fetch(cop))
    unified[cop]['Reference'] = reference(cop)
  end
end