demo_kubectl

#!/bin/bash
source bashui

#                       X    Y  name   function             colors
defb(){        button "$1" "$2" "$3"   "$4"         "$wht" "$ylw" "$bblk"; }
but_select_ns(){ defb "$1" "$2" select fun_select_ns                     ; }
but_select_po(){ defb "$1" "$2" select fun_select_po                     ; }
but_select_np(){ defb "$1" "$2" select fun_select_np                     ; }
but_all      (){ defb "$1" "$2" all    fun_all                           ; }
fun_all      (){ ns="--all-namespaces" nsname=all second="np np_data"    ; }
fun_select_np(){ ns="-n $_target_"     nsname=$_target_ po=${_target_[1]}; }
fun_select_ns(){ ns="-n $_target_"     nsname=$_target_                  ; }
fun_select_po(){ po=$_target_; }

#remove some spaces to preserve columns integrity
sp(){ sed 's/ (/(/g;s/ ago/_ago/g'; }

clear
w=$((COLUMNS-2))
#           X Y  height
#             width   columns              name                             colors            data
ns(){ items 2 2 $w 20 '60 20 20'          "Select Namespace"         "$wht" "$ylw" "$bblk" "${data[@]}"; }
po(){ items 2 2 $w 20 '40 15 15 15 15'    "Select Pod"               "$wht" "$ylw" "$bblk" "${data[@]}"; }
np(){ items 2 2 $w 20 '20 35 10 10 15 10' "Select Pod and Namespace" "$wht" "$ylw" "$bblk" "${data[@]}"; }

ns_data(){ data=( $(kubectl get ns)        ); buttons=(but_select_ns but_all); default_button but_select_ns; }
po_data(){ data=( $(kubectl get po $ns|sp) ); buttons=(but_select_po)        ; default_button but_select_po; }
np_data(){ data=( $(kubectl get po $ns|sp) ); buttons=(but_select_np)        ; default_button but_select_np; }

butts(){ x_row $LINES "${buttons[@]}"; }
menu (){
    cursor off
    _currentItem_=0
    WAIT; $2; GO
    [[ ${data[@]} ]] || { echo 'no data'; pause; exit; }
    while true; do
        $1
        butts
        [[ $ns ]] && XY 1 1 "$nsname: $po"
        read_input; case $_input_ in
             up     ) select_prev_item "${data[@]}"   ;;
             down   ) select_next_item "${data[@]}"   ;;
             left   ) select_prev_butt "${buttons[@]}";;
             right  ) select_next_butt "${buttons[@]}";;
             enter  ) press_button butts; return      ;;
             escape ) bye;;
             pgup   ) select_prev_item  --fast   "${data[@]}";;
             pgdown ) select_next_item  --fast   "${data[@]}";;
             *      ) select_by_hot_key $_input_ "${data[@]}";;
        esac
    done
}

second="po po_data"
menu ns ns_data
clear
menu $second
clear
echo "$nsname: $po"