#!/bin/bash

#set -o pipefail  # trace ERR through pipes
#set -o nounset   ## set -u : exit the script if you try to use an uninitialised variable
set -o errexit   ## set -e : exit the script if any statement returns a non-true return value
set -o errtrace  # trace ERR through 'time command' and other functions

traceback() {
  local -i start=1
  local -i end=${#BASH_SOURCE[@]}
  local -i i=0
  local -i j=0
  local cmd="$1"
  local -i code="$2"

  echo -e "\n >>> Traceback (last called is first) :" 1>&2
  echo -e " ==> \e[93m${cmd}\033[0m \e[1mretun \e[91m${code}\033[0m"
  for ((i=${start}; i < ${end}; i++)); do
    j=$(( $i - 1 ))
    local function="${FUNCNAME[$i]}"
    local file="${BASH_SOURCE[$i]}"
    local line="${BASH_LINENO[$j]}"
    echo "     ${function}() in ${file}:${line}" 1>&2
  done
}

usage() {
  echo "Usage :"
  echo "  `basename $0` <shell script>"
  exit 1
}

#trap 'exit_handler "$?" "$LINENO" "${BASH_LINENO[*]}" "${BASH_SOURCE[*]}" "$BASH_COMMAND" "${FUNCNAME[*]:-empty}"' ERR
trap 'traceback "$BASH_COMMAND" "$?"' ERR

[ -f "$1" ] || usage
. $1