sns

#!/bin/bash

# GMcB - a quick helper script to change Kubernetes namespace only
# Version 0.2

createmenu ()
{
  #echo "Items in the array: $#"
  #echo "$@"
  COLUMNS=1
  select option; do # in "$@" is the default
    if [ "$REPLY" -eq "$#" ];
    then
      echo "Exiting..."
      break;
    elif [ 1 -le "$REPLY" ] && [ "$REPLY" -le $(($#-1)) ];
    then
      return 0
      break;
    else
      echo "Incorrect Input: Select a number 1-$#"
    fi
  done
}

get_ns ()
{
  ns_array=($(kubectl get ns | grep -v NAME | awk '{print $1}'))
}

switch_namespace ()
{
  get_ns
  #echo -e "\nYou are currently in cluster" $(kubectl config current-context)
  echo -e "Please select your namespace:\n"
  createmenu "${ns_array[@]}"
  echo -e "\nSwitching to namespace $option"
  kubectl config set-context $(kubectl config current-context) --namespace=$option
  kcur
}

kcur () {

        echo -e "\nYou are currently here:\n"
        echo -e "Current Cluster:\t"    $(kubectl config current-context)
        echo -e "Current Namespace:\t"  $(kubectl config view -o=jsonpath="{.contexts[?(@.name==\"$(kubectl config current-context)\")].context.namespace}\n")
}

if [ $# -eq 0 ]; then
  switch_namespace
else
  get_ns
  if [[ ! " ${ns_array[@]} " =~ " $1 " ]]; then
    echo -e "\nUnable to switch namespace '$1' - namespace not found\n"
    switch_namespace
  else
    kubectl config set-context $(kubectl config current-context) --namespace=$1
    kcur
  fi
fi