#!/bin/bash

EDITOR=vim
PASSWD=/etc/passwd
RED='\033[0;41;30m'
STD='\033[0;0;39m'

pause(){
  read -p "Press [Enter] key to continue..." fackEnterKey
}
 

one(){
    echo "Give in a directory name:"
    read name
    if [ ! $# -gt 0 ]; then
        if [ -d $name ]; then
            echo "Ok. Here's the content of the given directory:"
            echo
            ls -l -- $name
            exit 0
        else
            echo "Directory name doesn't exist or isn't a directory."
            exit 1
        fi
    
    else
        echo "No or more than one param."
        exit 2
    fi
            pause
    }

show_menus() {
    clear  
    echo "~~~~~~~~~~~~~~~~~~~~~"    
    echo "      MAIN - MENU       "
    echo "~~~~~~~~~~~~~~~~~~~~~"
    echo "1. List content of a directory by given param"
    echo "2. Exit"
}

# read input from the keyboard and take a action
# invoke the one() when the user select 1 from the menu option.
# Exit when user the user select 2 form the menu option.
read_options(){
    local choice
    read -p "Enter choice [ 1 - 2] " choice
    case $choice in
        1)     one ;;
        2)     exit 0;;
        *)     echo -e "${RED}Error...${STD}" && sleep 1
    esac
}

# ----------------------------------------------
# Ignore CTRL+C, CTRL+Z and quit singles
# ----------------------------------------------
trap '' SIGINT SIGQUIT SIGTSTP

# -----------------------------------
# List menu while true
# ------------------------------------
while true
do 
    clear 
    show_menus
    read_options
done