`vagrant plugin uninstall`

plugins/commands/plugin/action.rb

@@ -22,12 +22,21 @@ module VagrantPlugins
         end
       end
 
+      # This middleware sequence will uninstall a plugin.
+      def self.action_uninstall
+        Vagrant::Action::Builder.new.tap do |b|
+          b.use BundlerCheck
+          b.use UninstallPlugin
+          b.use PruneGems
+        end
+      end
       # The autoload farm
       action_root = Pathname.new(File.expand_path("../action", __FILE__))
       autoload :BundlerCheck, action_root.join("bundler_check")
       autoload :InstallGem, action_root.join("install_gem")
       autoload :ListPlugins, action_root.join("list_plugins")
       autoload :PruneGems, action_root.join("prune_gems")
+      autoload :UninstallPlugin, action_root.join("uninstall_plugin")
     end
   end
 end

plugins/commands/plugin/action/uninstall_plugin.rb

@@ -0,0 +1,23 @@
+module VagrantPlugins
+  module CommandPlugin
+    module Action
+      # This middleware uninstalls a plugin by simply removing it from
+      # the state file. Running a {PruneGems} after should properly remove
+      # it from the gem index.
+      class UninstallPlugin
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          # Remove it!
+          env[:ui].info(I18n.t("vagrant.commands.plugin.uninstalling",
+                               :name => env[:plugin_name]))
+          env[:plugin_state_file].remove_plugin(env[:plugin_name])
+
+          @app.call(env)
+        end
+      end
+    end
+  end
+end

plugins/commands/plugin/command/root.rb

@@ -19,6 +19,11 @@ module VagrantPlugins
             require_relative "list"
             List
           end
+
+          @subcommands.register(:uninstall) do
+            require_relative "uninstall"
+            Uninstall
+          end
         end
 
         def execute

plugins/commands/plugin/command/uninstall.rb

@@ -0,0 +1,28 @@
+require 'optparse'
+
+require_relative "base"
+
+module VagrantPlugins
+  module CommandPlugin
+    module Command
+      class Uninstall < Base
+        def execute
+          opts = OptionParser.new do |o|
+            o.banner = "Usage: vagrant plugin uninstall <name> [-h]"
+          end
+
+          # Parse the options
+          argv = parse_options(opts)
+          return if !argv
+          raise Vagrant::Errors::CLIInvalidUsage, :help => opts.help.chomp if argv.length < 1
+
+          # Uninstall the gem
+          action(Action.action_uninstall, :plugin_name => argv[0])
+
+          # Success, exit status 0
+          0
+        end
+      end
+    end
+  end
+end

plugins/commands/plugin/state_file.rb

@@ -33,6 +33,14 @@ module VagrantPlugins
         @data["installed"]
       end
 
+      # Remove a plugin that is installed from the state file.
+      #
+      # @param [String] name The name of the plugin.
+      def remove_plugin(name)
+        @data["installed"].delete(name)
+        save!
+      end
+
       # This saves the state back into the state file.
       def save!
         # Scrub some fields

templates/locales/en.yml

@@ -419,6 +419,8 @@ en:
       plugin:
         installing: |-
           Installing the '%{name}' plugin...
+        uninstalling: |-
+          Uninstalling the '%{name}' plugin...
       status:
         aborted: |-
           The VM is in an aborted state. This means that it was abruptly