Add auto-completion for puppet parser:

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

custom/plugins/puppet/_puppet

@@ -404,6 +404,14 @@ _node_arguments=(
   '--terminus: TERMINUS The indirector terminus to use'
 )
 
+local -a _parser_arguments
+_parser_arguments=(
+  'validate:Validate the syntax of one or more Puppet manifests'
+  '--render-as:FORMAT The rendering format to use'
+  '--verbose:Whether to log verbosely'
+  '--debug:Whether to log debug information'
+)
+
 
 
 __task_list ()
@@ -824,6 +832,23 @@ __puppet-node ()
   esac
 }
 
+__puppet-parser ()
+{
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+
+  _arguments -C \
+    ':command:->command' \
+    '*::options:->options'
+
+  case $state in
+    (command)
+      _describe -t commands "gem subcommand" _parser_arguments
+      return
+    ;;
+  esac
+}
+
 
 
 local expl
@@ -968,6 +993,11 @@ case $state in
       (node)
           __puppet-node
       ;;
+
+      # Display sub-commands for puppet parser.
+      (parser)
+          __puppet-parser
+      ;;
     esac
   ;;
 esac