has_app.rb

require 'cfpropertylist'

module Puppet::Parser::Functions
  newfunction(:has_app, :type => :rvalue) do |args|
    if (args.is_a? String)
      args = [args]
    end
    appname = args[0]
    plist = CFPropertyList::List.new(:file => "/Library/Managed Installs/ApplicationInventory.plist")
    data = CFPropertyList.native_types(plist.value)
    list_of_applications = Hash.new
    data.each do |app|
      if app['name'] =~ /#{appname}/i
        list_of_applications[app['name']] = app
        has_app = list_of_applications[appname]["CFBundleName"]
        return has_app
      else
        false
      end
    end
  end
end