Some changes

Gemfile

@@ -1,5 +1,7 @@
 source "https://rubygems.org"
 
+gem 'rake'
+
 group :development do
   gem "vagrant", git: "https://github.com/mitchellh/vagrant.git"
 end

Rakefile

@@ -1,2 +1,3 @@
 require "bundler/gem_tasks"
 
+Bundler::GemHelper.install_tasks

lib/command.rb

@@ -3,9 +3,15 @@
 require 'find'
 require 'mixlib/shellout'
 require 'vagrant'
+require 'optparse'
 
 module Vbinfo
   class Command < Vagrant.plugin("2", :command)
+
+    def self.synopsis
+      "Outputs information for each Virtualbox VM in a given project"
+    end
+
     # Return an array of vm IDs for the vagrant project in the
     # current directory
     def ids
@@ -41,12 +47,8 @@ def execute
         o.banner = "Usage: vagrant vbinfo"
       end
 
-      argv = parse_options(opts)
-
-      return if !argv
-
       ids.each do |id|
-        puts "#{get_info(id).to_s}\n\n"
+        @env.ui.info("#{get_info(id).to_s}\n\n")
       end
       exit 0
     end

lib/plugin.rb

@@ -1,6 +1,5 @@
 #!/usr/bin/env ruby
 
-require_relative "vbinfo/version"
 require 'vagrant'
 
 module Vbinfo
@@ -12,7 +11,7 @@ class Plugin < Vagrant.plugin("2")
     DESC
 
     command("vbinfo") do
-      require_relative 'command'
+      require File.expand_path("../command", __FILE__)
       Command
     end
   end