#!/bin/bash

# CONSTANTS
DEBUG=true
TMP_ERROR=$(mktemp -t "$(basename $0).XXXXXXXX" --tmpdir=/run/user/$(id -u))
SCRIPT=$1

# FUNCTIONS

function exit {
  code=${1:-0}

  # a bit of magic: read content of file still on write!
  # count=$(wc -c $TMP_ERROR | cut -d' ' -f1)
  # content=$(head -qc$count $TMP_ERROR)

  if [[ -s $TMP_ERROR ]]; then
    content=$(<$TMP_ERROR)
    $DEBUG && >/dev/tty echo '---stderr---'
    >&4 echo "DETECTED: [$content]"
  fi

  stack_lines=("${BASH_LINENO[@]}")
  stack_functions=("${FUNCNAME[@]}")
  stack_sources=("${BASH_SOURCE[@]}")

  echo "${stack_lines[@]}"
  echo "${stack_functions[@]}"
  echo "${stack_sources[@]}"

  cleanup ${code}
}

function success {
  if [[ -s $TMP_ERROR ]]; then
    $DEBUG && >/dev/tty echo '---stderr---'
    >&2 cat $TMP_ERROR
  fi
  cleanup 0
}

function cleanup {
  code=${1:-0}
  $DEBUG && >/dev/tty echo "---exit $1---"
  trap - ERR TERM INT EXIT
  rm $TMP_ERROR
  exec 3>&- 4>&-
  builtin exit $code
}

# MAIN

set -TEue -o pipefail
trap 'exit $?' ERR TERM INT EXIT

# magic FD
exec 3>$TMP_ERROR 4>/dev/stderr
$DEBUG && >/dev/tty echo '---stdout---'
source $SCRIPT 2>&3
success