#
# ensure_packages.rb
#
require 'puppet/parser/functions'

module Puppet::Parser::Functions
  newfunction(:ensure_packages, :type => :statement, :doc => <<-EOS
Takes a list of packages and only installs them if they don't already exist.
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "ensure_packages(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size != 1
    raise(Puppet::ParseError, "ensure_packages(): Requires array " +
      "given (#{arguments[0].class})") if !arguments[0].kind_of?(Array)

    Puppet::Parser::Functions.function(:ensure_resource)
    arguments[0].each { |package_name|
      function_ensure_resource(['package', package_name, {'ensure' => 'present' } ])
    }
  end
end

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