#!/bin/bash
# Author: Nils Gerstner
# Last revision: 15 nov 2022 18:00
# Version: v0.1
# Description: 

#=== VARIABLES ================================================================#

declare -r SCRIPT_NAME=$(basename "$BASH_SOURCE" .sh)
declare -r HELP_MSG="Usage: $SCRIPT_NAME [OPTION]... [ARG]...
  -h    display this help and exit
"

#=== FUNCTIONS ================================================================#

# Print colored messages
_cmsg() {
	case "$1" in
		black)		COLOR="\033[0;30m" ;;
		white) 		COLOR="\033[1;37m" ;;
		grey)		COLOR="\033[1;30m" ;;
		lgrey) 		COLOR="\033[0;37m" ;;
		red) 		COLOR="\033[0;31m" ;;
		lred) 		COLOR="\033[1;31m" ;;
		green) 		COLOR="\033[0;32m" ;;
		lgreen) 	COLOR="\033[1;32m" ;;
		brown) 		COLOR="\033[0;33m" ;;
		yelow) 		COLOR="\033[1;33m" ;;
		blue) 		COLOR="\033[0;34m" ;;
		lblue) 		COLOR="\033[1;34m" ;;
		purple) 	COLOR="\033[0;35m" ;;
		lpurple)	COLOR="\033[1;35m" ;;
		cyan) 		COLOR="\033[0;36m" ;;
		lcyan) 		COLOR="\033[1;36m" ;;
		nocolor)	COLOR="\033[0m" ;;
	esac
	printf "${COLOR}${2}\33[0m\n"
}

# exit the shell(default status code: 1) after printing the message to stderr
_bail() {
    >&2 echo -ne "$1"
    exit ${2-1}
} 

# print the usage and exit the shell(default status code: 2)
_usage() {
    local status=2
    if [[ "$1" =~ ^[0-9]+$ ]]; then
        status=$1
        shift
    fi
    _bail "${1}$HELP_MSG" $status
}

# print fancy error message
_failure() {
  local lineno=$1
  local msg=$2
  >&2 echo "Failed at $lineno: $msg"
}

#=== SET ENVIRONMENT AND EXIT CONDITIONS ======================================#

# -e Exit immediately on error
# -E ERR trap is inherited by shell functions
set -eE -o functrace

trap '_failure ${LINENO} "$BASH_COMMAND"' ERR

#=== HANDLE ARGUMENTS =========================================================#

while getopts ":hie:" opt; do
    case $opt in
	i)  
      # Do something 
      #(for ex. execute a function or set a switch variable)
	    ;;
	e)  
      # Option with argument
      e_argument=${OPTARG}
	    ;;
    h)
      _usage 0
      ;;
    \?)
      _usage "Invalid option: -$OPTARG \n"
            ;;
    esac
done

shift $OPTIND
[[ "$#" -lt 1 ]] && usage "Too few arguments\n"

#=== MAIN CODE GOES HERE ======================================================#

echo "Start!"