--- /dev/null
+#
+# keys.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:keys, :type => :rvalue, :doc => <<-EOS
+Returns the keys of a hash as an array.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "keys(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size < 1
+
+ hash = arguments[0]
+
+ unless hash.is_a?(Hash)
+ raise(Puppet::ParseError, 'keys(): Requires hash to work with')
+ end
+
+ result = hash.keys
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :