--- /dev/null
+#
+# flatten.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:flatten, :type => :rvalue, :doc => <<-EOS
+This function flattens any deeply nested arrays and returns a single flat array
+as a result.
+
+*Examples:*
+
+ flatten(['a', ['b', ['c']]])
+
+Would return: ['a','b','c']
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "flatten(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size != 1
+
+ array = arguments[0]
+
+ unless array.is_a?(Array)
+ raise(Puppet::ParseError, 'flatten(): Requires array to work with')
+ end
+
+ result = array.flatten
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :