Kubeconfig Context Switcher

kx.sh

#!/usr/bin/env bash

usage () {
  echo "Usage: kx [OPERATION]"
  echo "  -h             Help. Displays this message."
  echo "  -l             list contexts"
  echo "  -c             get current context"
  echo "  -s             set context"
  echo "  -d             delete context"
}

list_contexts() {
  select context in $(kubectl config get-contexts -o=name | sort -n) exit; do
     case $context in
        exit) echo "exiting"
              break ;;
           *) context_val=$context;
             break ;;
     esac
  done
}

confirm() {
    read -r -p "${1:-Are you sure? [y/N]} " response
    case "$response" in
        [yY][eE][sS]|[yY])
            true
            ;;
        *)
            false
            ;;
    esac
}

[ $# -eq 0 ] && usage
while getopts ":lsdch" opt; do
  case "${opt}" in
    l)
      kubectl config get-contexts -o=name | sort -n
      ;;
    s)
      list_contexts
      kubectl config use-context "${context_val}"
      ;;
    c)
      kubectl config current-context
      ;;
    d)
      list_contexts
      confirm "Are you sure you want to delete ${context_val}? [y/N]"&& \
      kubectl config delete-context "${context_val}" && \
      kubectl config delete-cluster "${context_val}" && \
      kubectl config delete-user "${context_val}"
      ;;
    \?)
      >&2 echo "Invalid option: $OPTARG."
      usage
      ;;
    :)
      >&2 echo "Missing argument: $OPTARG requires an argument."
      usage
      ;;
    h | *)
      usage
      exit 0
      ;;
  esac
done
shift $((OPTIND -1))