flatten_to_argument_list.rb
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flatten_to_argument_list.rb
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	require 'shellwords'

	Puppet::Functions.create_function(:flatten_to_argument_list) do
	dispatch :flatten_to_argument_list do
	param 'Hash', :variable
	optional_param 'String', :escaping_type
	optional_param 'String', :prefix
	return_type 'Array[String]'
	end

	def flatten_to_argument_list(variable, escaping_type = 'systemd', prefix = '--')
	ret = []
	variable.each do \|key, value\|
	arg = "#{prefix}#{key}".gsub('_', '-')
	if Hash === value
	ret += flatten_to_argument_list(value, escaping_type, "#{arg}.")
	else
	if value == true
	ret.push(arg)
	else
	if escaping_type == 'systemd'
	# This replaces every backslash with four backslashes to please
	# systemd's EnvironmentFile escaping. Yes, gsub needs four
	# backslashes per output backslash.
	value.gsub!('\\', '\\\\\\\\\\\\\\\\')
	elsif escaping_type == 'shell'
	value = Shellwords.escape(value)
	end
	ret.push("#{arg}=#{value}")
	end
	end
	end
	ret
	end
	end