class Bake::Registry::Aggregate

def self.default(working_directory, bakefile_path = nil)

@parameter working_directory [String]
Create a loader using the specified working directory. 
def self.default(working_directory, bakefile_path = nil)
	registry = self.new
	
	if bakefile_path
		registry.append_bakefile(bakefile_path)
	end
	
	registry.append_defaults(working_directory)
	
	return registry
end

def append_bakefile(path) 

def append_bakefile(path)
	@ordered << BakefileLoader.new(path)
end

def append_defaults(working_directory)

@parameter working_directory [String]
Add registry according to the current working directory and loaded gems. 
def append_defaults(working_directory)
	# Load recipes from working directory:
	self.append_path(working_directory)
	
	# Load recipes from loaded gems:
	self.append_from_gems
end

def append_from_gems

Enumerate all loaded gems and add them. 
def append_from_gems
	::Gem.loaded_specs.each do |name, spec|
		Console.debug(self) {"Checking gem #{name}: #{spec.full_gem_path}..."}
		
		if path = spec.full_gem_path and File.directory?(path)
			append_path(path, name: spec.full_name)
		end
	end
end

def append_path(current = Dir.pwd, **options)

@parameter current [String] The path to add.
The computed path will have `bake` appended to it.
Append a specific project path to the search path for recipes. 
def append_path(current = Dir.pwd, **options)
	bake_path = File.join(current, "bake")
	
	if File.directory?(bake_path)
		return insert(bake_path, **options)
	end
	
	return false
end

def each(&block)

Enumerate the registry in order. 
def each(&block)
	@ordered.each(&block)
end

def empty?

@returns [Boolean]
Whether any registry are defined. 
def empty?
	@ordered.empty?
end

def initialize

Initialize an empty array of registry. 
def initialize
	# Used to de-duplicated directories:
	@roots = {}
	
	# The ordered list of loaders:
	@ordered = Array.new
end

def insert(directory, **options) 

def insert(directory, **options)
	unless @roots.key?(directory)
		Console.debug(self) {"Adding #{directory.inspect}"}
		
		loader = DirectoryLoader.new(directory, **options)
		@roots[directory] = loader
		@ordered << loader
		
		return true
	end
	
	return false
end

def scopes_for(path, &block) 

def scopes_for(path, &block)
	@ordered.each do |registry|
		registry.scopes_for(path, &block)
	end
end