class Bundler::Settings

def [](key)
  key = key_for(key)
  @config[key] || ENV[key]
end

def []=(key, value)
  key = key_for(key)
  unless @config[key] == value
    @config[key] = value
    FileUtils.mkdir_p(config_file.dirname)
    File.open(config_file, 'w') do |f|
      f.puts @config.to_yaml
    end
  end
  value
end

def config_file
  Pathname.new("#{@root}/.bundle/config")
end

def initialize(root)
  @root   = root
  @config = File.exist?(config_file) ? YAML.load_file(config_file) : {}
end

def key_for(key)
  "BUNDLE_#{key.to_s.upcase}"
end

def path
  path = ENV[key_for(:path)]
  return path if path
  if path = self[:path]
    "#{path}/#{Bundler.ruby_scope}"
  else
    Gem.dir
  end
end

def without
  self[:without] ? self[:without].split(":").map { |w| w.to_sym } : []
end

def without=(array)
  unless array.empty? && without.empty?
    self[:without] = array.join(":")
  end
end