longest.rb

# <modulepath>/custom_functions/lib/puppet/parser/functions/longest.rb

Puppet::Parser::Functions.newfunction(:longest, :type => :rvalue, :doc => "Longest Function") do |args|
  raise Puppet::Error, "#longest: accepts only one argument, you passed #{args.length}" if args.length != 1
  raise Puppet::Error, "#longest: accepts a single Array, you passed: #{args[0].class}" if args[0].class != Array

  @longest = ''
  args[0].each do |item|
    @longest = item if item.length > @longest.length
  end

  @lon