str2bool.rb
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str2bool.rb
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	#
	# str2bool.rb
	#

	module Puppet::Parser::Functions
	newfunction(:str2bool, :type => :rvalue, :doc => <<-EOS
	This converts a string to a boolean. This attempt to convert strings that
	contain things like: y, 1, t, true to 'true' and strings that contain things
	like: 0, f, n, false, no to 'false'.
	EOS
	) do \|arguments\|

	raise(Puppet::ParseError, "str2bool(): Wrong number of arguments " +
	"given (#{arguments.size} for 1)") if arguments.size < 1

	string = arguments[0]

	unless string.is_a?(String)
	raise(Puppet::ParseError, 'str2bool(): Requires either ' +
	'string to work with')
	end

	# We consider all the yes, no, y, n and so on too ...
	result = case string
	#
	# This is how undef looks like in Puppet ...
	# We yield false in this case.
	#
	when /^$/, '' then false # Empty string will be false ...
	when /^(1\|t\|y\|true\|yes)$/ then true
	when /^(0\|f\|n\|false\|no)$/ then false
	when /^(undef\|undefined)$/ then false # This is not likely to happen ...
	else
	raise(Puppet::ParseError, 'str2bool(): Unknown type of boolean given')
	end

	return result
	end
	end

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