[adolph]

Don't keep anything in the default .kube/config. Set KUBECONFIG envar instead. Keep every cluster in separate config. Set an indicator in PS1. Helm et al follow the envar. Roast my zsh:

  k8x() {
    export env=$1;
  # exit if no param
    if [ -z $1 ]; then
      if [ -z ${KUBECONFIG+x} ]; then 
        echo "Need param of a k8s environment";
        return 1
      else 
        echo "Removing KUBECONFIG variable";
        PS1="$(echo "$PS1" | sed -e 's;^([^)]*) ;;')";
        unset KUBECONFIG;
        return 0
      fi
    fi;
  # exit if no file for param
    cfgPath="$HOME/.kube/config.${env}";
    if [ ! -f $cfgPath ]; then
      echo "A config does not exist";
      return 1
    fi;
    PS1="$(echo "$PS1" | sed -e 's;^([^)]*) ;;' -e 's;^;('$env') ;')";
    export KUBECONFIG="$cfgPath";
  }