class Bundler::Audit::Configuration

def self.load(file_path)
  raise(FileNotFound,"Configuration file '#{file_path}' does not exist") unless File.exist?(file_path)
  doc = YAML.parse(File.new(file_path))
  unless doc.root.kind_of?(YAML::Nodes::Mapping)
    raise(InvalidConfigurationError,"Configuration found in '#{file_path}' is not a Hash")
  end
  config = {}
  doc.root.children.each_slice(2) do |key,value|
    case key.value
    when 'ignore'
      unless value.is_a?(YAML::Nodes::Sequence)
        raise(InvalidConfigurationError,"'ignore' key found in config file, but is not an Array")
      end
      unless value.children.all? { |node| node.is_a?(YAML::Nodes::Scalar) }
        raise(InvalidConfigurationError,"'ignore' array in config file contains a non-String")
      end
      config[:ignore] = value.children.map(&:value)
    end
  end
  new(config)
end

def initialize(config={})
  @ignore = Set.new(config[:ignore])
end