module Ratch

  module ConfigUtils

    DEFAULT_CONFIG_FILE = 'config'

    #

    def configuration(file=nil)
      @configuration ||= {}
      if file = config_file(file)
        @configuration[file] ||= config_read(file)
      else
        @configuration[file] ||= Hash.new{ |h,k| h[k] = {} }
      end
    end

    #

    def config_file(path=nil)
      path ||= DEFAULT_CONFIG_FILE
      find = "{#{utility_directory}/,}#{path}{.yaml,.yml,}"
      file = Dir.glob(find)[0]
      return file
    end

    # Load configuration data from a file. THe file will
    # be looked for in the current script directory then
    # from the project root.
    #
    # Since they are YAML files, they can optionally
    # end with '.yaml' or '.yml'.

    def config_read(path)
      find = "{#{utility_directory}/,}#{path}{.yaml,.yml,}"
      if file = Dir.glob(find)[0]
        YAML::load(File.open(file))
      else
        raise LoadError, "Missing file -- #{path}"
      end
    end

    # TODO Better name? Better definition? (Won't handle task subdirs well).

    def utility_directory
      File.dirname($0)
    end

    # Create an argument vector from a set of config options.
    # TODO Deprecate in favor of Hash extension.

    def config_vector(config, args_field=nil)
      config.command_vector(args_field)
    end

#     # FIXME ProjectInfo, if available.
#
#     def projectinfo
#       require 'box/project'
#       @projectinfo
#
#       #begin
#       #  @projectinfo = ProjectInfo.open
#       #rescue LoadError
#       #  @projectinfo = nil
#       #end
#     end

#     def config_file
#       @config_file ||= (
#         dir  = utility_directory
#         name = Dir.basename(dir)
#         Dir.glob("{#{dir},meta,info,}/{#{name},config}{.yaml,.yml}")
#       )
#     end

#     # Load task configuration if any.
#
#     def config_load(*names) #, defaults=nil)
#
#       names.inject({}) do |memo, name|
#         name     = name.to_s
#         #defaults = defaults || {}
#
#         if file = config_file(name)
#           config = YAML.load(File.open(file))
#         elsif file = Dir.glob("#{utility_directory}/config{,.yaml,.yml}")[0]
#           config = YAML.load(File.open(file))[name.to_s]
#         else
#           config = {}
#         end
#
#         config.update(memo)
#       end
#       #return defaults.update(config || {})
#     end

  end
end