Add auto-completion for puppet plugin:

Provides auto-complete options for puppet plugin sub-command.

custom/plugins/puppet/_puppet

@@ -412,6 +412,14 @@ _parser_arguments=(
   '--debug:Whether to log debug information'
 )
 
+local -a _plugin_arguments
+_plugin_arguments=(
+  'download:Download plugins from the puppet master'
+  '--render-as:FORMAT The rendering format to use'
+  '--verbose:Whether to log verbosely'
+  '--debug:Whether to log debug information'
+)
+
 
 
 __task_list ()
@@ -849,6 +857,23 @@ __puppet-parser ()
   esac
 }
 
+__puppet-plugin ()
+{
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+
+  _arguments -C \
+    ':command:->command' \
+    '*::options:->options'
+
+  case $state in
+    (command)
+      _describe -t commands "gem subcommand" _plugin_arguments
+      return
+    ;;
+  esac
+}
+
 
 
 local expl
@@ -998,6 +1023,11 @@ case $state in
       (parser)
           __puppet-parser
       ;;
+
+      # Display sub-commands for puppet plugin.
+      (plugin)
+          __puppet-plugin
+      ;;
     esac
   ;;
 esac