#!/bin/bash

#/**************************************************************************
#*   This program is free software; you can redistribute it and/or modify  *
#*   it under the terms of the WTFPL 2.0 or later, see                     * 
#*   http://www.wtfpl.net/about/                                           *
#*                                                                         *
#*   This program is distributed in the hope that it will be useful,       *
#*   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
#*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                  *
#*                                                                         *
#***************************************************************************/

# A dialog to override configuration options.
# Whiptail is not as easily deployed here, as other dialogs.
# The main difficulty arises from the fact that positive defaults 
# are negated, while a checklist wants to give positive results.

if [ $# -eq 0 ]
then
  echo "ERROR: file-argument missing"
  exit 1
fi
OUTFILE="$1"

# empty the file
truncate $OUTFILE -s0

TITLE="Override post-processor configuration"
CHECKTITLE="Deselect to disable. Esc or Cancel close the dialog and no changes will be applied."

# These are the configuration variables which can be unset.
VARS=(GROUP_SIGS CUSTOM_HEADERS NO_ARCHIVE_GROUPS VFY_URLS DEBUG_LOG)

# Checklist options
options=(GROUP_SIGS 'Signatures' ON CUSTOM_HEADERS 'Custom headers' ON NO_ARCHIVE_GROUPS 'No Archive' ON VFY_URLS 'Correct URLs' ON DEBUG_LOG 'Log' ON)

# show dialog and store results
result=$(whiptail --title "$TITLE" --checklist "$CHECKTITLE" 13 55 5 "${options[@]}" 3>&1 1>&2 2>&3)
# which button had been pushed?
okcancel=$?

# make an array
read -ra opts <<< $result

# comment out -------->
echo "cancel/ok ? $okcancel"
echo $result
echo "${opts[@]}"
echo "${#opts[@]}"
# <--------

# Find deselected options which shall be written to the outfile. 
# Looks complicated. 
if [ "$okcancel" -eq 0 ]
then
  list=''
  # check each available variable ...
  for c in ${VARS[@]}
  do
	deactivate=TRUE
	# ... against the result from the dialog
	for o in ${opts[@]}
	do
	  if [ "$o" == "\"$c\"" ]	
	  then
		# ignore if a variable remained checked ...
		deactivate=FALSE
	  fi
	done
	# ... else write it to the list.
	if [ "$deactivate" == TRUE ]
	then

	  list="$list $c"
	fi
  done
  # Heureka.
  echo "$list" > "$OUTFILE"
else
  echo "exit" > "$OUTFILE"
fi

# Ω