Add zsh completion

contrib/completions/zsh/kubectl

+#!/bin/zsh
+
+# Copyright 2016 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__kubectl_bash_source() {
+  alias shopt=':'
+  alias _expand=_bash_expand
+  alias _complete=_bash_comp
+  emulate -L sh
+  setopt kshglob noshglob braceexpand
+
+  source "$@"
+}
+
+__kubectl_type() {
+	# -t is not supported by zsh
+	if [ "$1" == "-t" ]; then
+		shift
+
+		# fake Bash 4 to disable "complete -o nospace". Instead
+		# "compopt +-o nospace" is used in the code to toggle trailing
+		# spaces. We don't support that, but leave trailing spaces on
+		# all the time
+		if [ "$1" = "__kubectl_compopt" ]; then
+			echo builtin
+			return 0
+		fi
+	fi
+	type "$@"
+}
+
+__kubectl_compgen() {
+	local completions w
+	completions=( $(compgen "$@") ) || return $?
+
+	# filter by given word as prefix
+	while [[ "$1" = -* && "$1" != -- ]]; do
+		shift
+		shift
+	done
+	if [[ "$1" == -- ]]; then
+		shift
+	fi
+	for w in "${completions[@]}"; do
+		if [[ "${w}" = "$1"* ]]; then
+			echo "${w}"
+		fi
+	done
+}
+
+__kubectl_compopt() {
+	true # don't do anything. Not supported by bashcompinit in zsh
+}
+
+__kubectl_declare() {
+	if [ "$1" == "-F" ]; then
+		whence -w "$@"
+	else
+		builtin declare "$@"
+	fi
+}
+
+__kubectl_ltrim_colon_completions()
+{
+	if [[ "$1" == *:* && "$COMP_WORDBREAKS" == *:* ]]; then
+		# Remove colon-word prefix from COMPREPLY items
+		local colon_word=${1%${1##*:}}
+		local i=${#COMPREPLY[*]}
+		while [[ $((--i)) -ge 0 ]]; do
+			COMPREPLY[$i]=${COMPREPLY[$i]#"$colon_word"}
+		done
+	fi
+}
+
+__kubectl_get_comp_words_by_ref() {
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[${COMP_CWORD}-1]}"
+	words=("${COMP_WORDS[@]}")
+	cword=("${COMP_CWORD[@]}")
+}
+
+__kubectl_filedir() {
+	local RET OLD_IFS w qw
+
+	__debug "_filedir $@ cur=$cur"
+	if [[ "$1" = \~* ]]; then
+		# somehow does not work. Maybe, zsh does not call this at all
+		eval echo "$1"
+		return 0
+	fi
+
+	OLD_IFS="$IFS"
+	IFS=$'\n'
+	if [ "$1" = "-d" ]; then
+		shift
+		RET=( $(compgen -d) )
+	else
+		RET=( $(compgen -f) )
+	fi
+	IFS="$OLD_IFS"
+
+	IFS="," __debug "RET=${RET[@]} len=${#RET[@]}"
+
+	for w in ${RET[@]}; do
+		if [[ ! "${w}" = "${cur}"* ]]; then
+			continue
+		fi
+		if eval "[[ \"\${w}\" = *.$1 || -d \"\${w}\" ]]"; then
+			qw="$(__kubectl_quote "${w}")"
+			if [ -d "${w}" ]; then
+				COMPREPLY+=("${qw}/")
+			else
+				COMPREPLY+=("${qw}")
+			fi
+		fi
+	done
+}
+
+__kubectl_quote() {
+    if [[ $1 == \'* || $1 == \"* ]]; then
+        # Leave out first character
+        printf %q "${1:1}"
+    else
+    	printf %q "$1"
+    fi
+}
+
+autoload -U +X compinit && compinit
+autoload -U +X bashcompinit && bashcompinit
+__kubectl_bash_source <(sed \
+	-e 's/declare -F/whence -w/' \
+	-e 's/local \([a-zA-Z0-9_]*\)=/local \1; \1=/' \
+	-e 's/flags+=("\(--.*\)=")/flags+=("\1"); two_word_flags+=("\1")/' \
+	-e 's/must_have_one_flag+=("\(--.*\)=")/must_have_one_flag+=("\1")/' \
+	-e 's/[[:<:]]_filedir[[:>:]]/__kubectl_filedir/g' \
+	-e 's/[[:<:]]_get_comp_words_by_ref[[:>:]]/__kubectl_get_comp_words_by_ref/g' \
+	-e 's/[[:<:]]__ltrim_colon_completions[[:>:]]/__kubectl_ltrim_colon_completions/g' \
+	-e 's/[[:<:]]compgen[[:>:]]/__kubectl_compgen/g' \
+	-e 's/[[:<:]]compopt[[:>:]]/__kubectl_compopt/g' \
+	-e 's/[[:<:]]declare[[:>:]]/__kubectl_declare/g' \
+	-e 's/\$(type[[:>:]]/$(__kubectl_type/g' \
+	$(dirname $0)/../bash/kubectl
+)