Add auto-completion for puppet config:

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

custom/plugins/puppet/_puppet

@@ -170,6 +170,16 @@ _certificate_revocation_list_arguments=(
   '--terminus: TERMINUS The indirector terminus to use'
 )
 
+local -a _config_arguments
+_config_arguments=(
+  "print:Examine Puppet's current settings"
+  "set:Set Puppet's settings"
+  '--render-as:FORMAT The rendering format to use'
+  '--verbose:Whether to log verbosely'
+  '--debug:Whether to log debug information'
+  '--section:SECTION_NAME The section of the configuration file to interact with'
+)
+
 __task_list ()
 {
     local expl
@@ -299,6 +309,23 @@ __puppet-certificate_revocation_list ()
   esac
 }
 
+__puppet-config ()
+{
+  local curcontext="$curcontext" state line
+  typeset -A opt_args
+
+  _arguments -C \
+    ':command:->command' \
+    '*::options:->options'
+
+  case $state in
+    (command)
+      _describe -t commands "gem subcommand" _config_arguments
+      return
+    ;;
+  esac
+}
+
 
 
 local expl
@@ -358,6 +385,11 @@ case $state in
       (certificate_revocation_list)
           __puppet-certificate_revocation_list
       ;;
+
+      # Display sub-commands for puppet config.
+      (config)
+          __puppet-config
+      ;;
     esac
   ;;
 esac