gistfile1.rb

# printers.rb

Facter.add('printers') do
        confine :kernel => %w{Linux FreeBSD OpenBSD SunOS Darwin}
        confine do
                Facter::Core::Execution.which('lpstat')
        end

        setcode do
                output = Array.new
                printers = Facter::Core::Execution.exec('/usr/bin/lpstat -a')
                printers.each_line { |line| output.push(line.split.first)}
                output
        end
end

Facter.add('printers_foreign') do
        confine :printers

        setcode do
                house_printers = ["PrintFollowMe"]
                printers = Array.new
                Facter.value("printers").each { |printer| printers.push(printer) }
                res = house_printers & printers
                output = printers.count - res.count
                output
        end
end