Replace _kitchen completion with the version from zsh-users (#5011)

plugins/kitchen/_kitchen

-# author: Peter Eisentraut
-# source: https://gist.github.com/petere/10307599
-# compdef kitchen
+#compdef kitchen
+# ------------------------------------------------------------------------------
+# Copyright (c) 2014 Github zsh-users - http://github.com/zsh-users
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of the zsh-users nor the
+#       names of its contributors may be used to endorse or promote products
+#       derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL ZSH-USERS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ------------------------------------------------------------------------------
+# Description
+# -----------
+#
+#  Completion script for Test Kitchen (http://kitchen.ci/).
+#
+# ------------------------------------------------------------------------------
+# Authors
+# -------
+#
+#  * Peter Eisentraut (https://github.com/petere)
+#
+# ------------------------------------------------------------------------------
+
 
 _kitchen() {
   local curcontext="$curcontext" state line
@@ -11,12 +48,12 @@ _kitchen() {
 
   case $state in
     cmds)
-			_arguments "1:Commands:(console converge create destroy diagnose driver help init list login setup test verify version)"
+      _kitchen_commands
       ;;
     args)
       case $line[1] in
         converge|create|destroy|diagnose|list|setup|test|verify)
-					compadd "$@" all
+          compadd 'all'
           _kitchen_instances
           ;;
         login)
@@ -27,15 +64,22 @@ _kitchen() {
   esac
 }
 
+_kitchen_commands() {
+  local commands
+
+  commands=("${(@f)$(_call_program commands $service help | sed -n 's/^  kitchen \([[:alpha:]]*\) [ [].*# \(.*\)$/\1:\2/p')}")
+  _describe -t commands 'kitchen commands' commands
+}
+
 _kitchen_instances() {
   if [[ $_kitchen_instances_cache_dir != $PWD ]]; then
     unset _kitchen_instances_cache
   fi
   if [[ ${+_kitchen_instances_cache} -eq 0 ]]; then
-		_kitchen_instances_cache=(${(f)"$(bundle exec kitchen list -b 2>/dev/null || kitchen list -b 2>/dev/null)"})
+    _kitchen_instances_cache=(${(f)"$(_call_program instances $service list -b 2>/dev/null)"})
     _kitchen_instances_cache_dir=$PWD
   fi
-	compadd -a _kitchen_instances_cache
+  _wanted instances expl 'instance' compadd -a _kitchen_instances_cache
 }
 
 _kitchen "$@"