fqdn_rotate.rb
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	#
	# fqdn_rotate.rb
	#

	Puppet::Parser::Functions.newfunction(
	:fqdn_rotate,
	:type => :rvalue,
	:doc => "Usage: `fqdn_rotate(VALUE, [SEED])`. VALUE is required and
	must be an array or a string. SEED is optional and may be any number
	or string.

	Rotates VALUE a random number of times, combining the `$fqdn` fact and
	the value of SEED for repeatable randomness. (That is, each node will
	get a different random rotation from this function, but a given node's
	result will be the same every time unless its hostname changes.) Adding
	a SEED can be useful if you need more than one unrelated rotation.") do \|args\|

	raise(Puppet::ParseError, "fqdn_rotate(): Wrong number of arguments given (#{args.size} for 1)") if args.size < 1

	value = args.shift
	require 'digest/md5'

	unless value.is_a?(Array) \|\| value.is_a?(String)
	raise(Puppet::ParseError, 'fqdn_rotate(): Requires either array or string to work with')
	end

	result = value.clone

	string = value.is_a?(String) ? true : false

	# Check whether it makes sense to rotate ...
	return result if result.size <= 1

	# We turn any string value into an array to be able to rotate ...
	result = string ? result.split('') : result

	elements = result.size

	seed = Digest::MD5.hexdigest([lookupvar('::fqdn'),args].join(':')).hex
	# deterministic_rand() was added in Puppet 3.2.0; reimplement if necessary
	if Puppet::Util.respond_to?(:deterministic_rand)
	offset = Puppet::Util.deterministic_rand(seed, elements).to_i
	else
	if defined?(Random) == 'constant' && Random.class == Class
	offset = Random.new(seed).rand(elements)
	else
	old_seed = srand(seed)
	offset = rand(elements)
	srand(old_seed)
	end
	end
	offset.times {
	result.push result.shift
	}

	result = string ? result.join : result

	return result
	end

	# vim: set ts=2 sw=2 et :

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