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zsh/.config/zsh/completion/_k

#compdef k
_k() {
	local state
	_arguments '1: :(environment namespace files)' '2: :->environment' '3: :->namespace' '4: :->files'

	case $state in
		environment)
			_arguments -s "1: :(- $(kubectl get namespaces -o=jsonpath='{range .items[*].metadata.name}{@}{"\n"}{end}'))"
		;;
		namespace)
			local KUBECTX="${HOME}/.kube/kubectx"
			PREV=""

			local all_contexts="$(kubectl config get-contexts --output='name')"
			if [ -f "$KUBECTX" ]; then
				# show '-' only if there's a saved previous context
				local PREV=$(cat "${KUBECTX}")

				_arguments \
					"-d:*: :(${all_contexts})" \
					"(- *): :(- ${all_contexts})"
			else
				_arguments \
					"-d:*: :(${all_contexts})" \
					"(- *): :(${all_contexts})"
			fi
		;;
		files)
			_files
		;;
	esac
}
_k