show a prompt listing all files start with __ and run grunt over the selected file

kickoff.bash

NC='\033[0m'
RED='\033[0;31m'
YELLOW='\033[1;33m'
LIGHT_PURPLE='\033[1;35m'


clear_screen()
{
	printf "\ec"
}


align_center()
{
  termwidth="$(tput cols)"
  padding="$(printf '%0.1s' " "{1..500})"
  printf '%*.*s %s %*.*s\n' 0 "$(((termwidth-2-${#1})/2))" "$padding" "$1" 0 "$(((termwidth-1-${#1})/2))" "$padding"
}


hr()
{
	eval printf %.0s$1 '{1..'"${COLUMNS:-$(tput cols)}"\}
}


clear_screen

i=0
for f in __*.js
do
    files[i]="$f"
    files[i+1]=" "
    ((i+=2))
done


choice=$(whiptail --menu "Please select the file to grunt!?" 14 40 6 "${files[@]}" 3>&1 1>&2 2>&3)

echo -e $LIGHT_PURPLE
hr "ꕹ" && align_center "grunt ${choice}" && hr "ꕹ"
echo -e $NC

grunt $choice