vmware.rb

require 'rake'
require 'rake/tasklib'

class VMWare < ::Rake::TaskLib
  def initialize(vm_path, vm_name)
    @vmrun = '/Library/Application\ Support/VMware\ Fusion/vmrun'
    @vm_path = vm_path
    @vm_name = vm_name
    
    define
  end
  
  def define
    namespace :vmware do
      namespace @vm_name.to_sym do
        desc "list snapshots"
        task :list_snapshots do
          system("#{@vmrun} listSnapshots #{@vm_path}")
        end
      end
    end
  end
end

base_dir = Dir.new(File.expand_path('~/Documents/Virtual Machines.localized'))
available_vms = base_dir.find_all {|e| e =~ /vmwarevm$/}
available_vms.each do |vm|
  name = vm.gsub('.vmwarevm', '').gsub(/\s+/, '_').downcase
  vm_path = File.join(base_dir.path, vm).gsub(/ /, '\ ')
  VMWare.new(vm_path, name)
end