Bash: set default namespace for kubectl command

kubens_bashrc.sh

### kubens - set default namespace for kubectl command

function kubens {
	if [[ -n "$1" ]] ; then
		alias kubectl="kubectl -n $1"
		export HELM_NAMESPACE="$1"
		PS1=$( echo "$PS1" | sed -r 's/(.*)\(ns:[^)]*\)(.*)/\1\2/' )
		PS1="(ns:$1)${PS1}"
	else
		unalias kubectl
		unset HELM_NAMESPACE
		PS1=$( echo "$PS1" | sed -r 's/(.*)\(ns:[^)]*\)(.*)/\1\2/' )
	fi
}

function _kubens_completions() {
	[[ "${#COMP_WORDS[@]}" != "2" ]] && return
	COMPREPLY=($(compgen -W "`kubectl get ns -o jsonpath='{.items[*].metadata.name}'`" -- "${COMP_WORDS[1]}"))
}

complete -F _kubens_completions kubens

### end kubens