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#!/bin/bash
#   pacdiff : a simple pacnew/pacorig/pacsave updater
#
#   Copyright (c) 2007 Aaron Griffin <aaronmgriffin@gmail.com>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   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.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

declare -r myname='pacdiff'

diffprog=${DIFFPROG:-vimdiff}
diffsearchpath=${DIFFSEARCHPATH:-/etc}
locate=0

usage() {
  echo "$myname : a simple pacnew/pacorig/pacsave updater"
  echo "Usage : $myname [-l]"
  echo "  -l/--locate makes $myname use locate rather than find"
  echo "  DIFFPROG variable allows to override the default vimdiff"
  echo "  DIFFSEARCHPATH allows to override the default /etc path"
  echo "Example : DIFFPROG=meld DIFFSEARCHPATH=\"/boot /etc /usr\" $myname"
}

cmd() {
  if [ $locate -eq 1 ]; then
    locate -0 -e -b \*.pacnew \*.pacorig \*.pacsave
  else
    find $diffsearchpath \( -name \*.pacnew -o -name \*.pacorig -o -name \*.pacsave \) -print0
  fi
}

if [ $# -gt 0 ]; then
  case $1 in
    -l|--locate)
    locate=1;;
    *)
    usage; exit 0;;
  esac
fi

# see http://mywiki.wooledge.org/BashFAQ/020
while IFS= read -u 3 -r -d '' pacfile; do
  file="${pacfile%.pac*}"
  echo "File: $file"
  if [ ! -f "$file" ]; then
    echo "  $file does not exist"
    rm -i "$pacfile"
    continue
  fi
  check="$(cmp "$pacfile" "$file")"
  if [ -z "${check}" ]; then
    echo "  Files are identical, removing..."
    rm "$pacfile"
  else
    echo -n "  File differences found. (V)iew, (S)kip, (R)emove: [v/s/r] "
    while read c; do
      case $c in
        r|R) rm "$pacfile"; break ;;
        v|V)
        $diffprog "$pacfile" "$file"
        rm -i "$pacfile"; break ;;
        s|S) break ;;
        *) echo -n "  Invalid answer. Try again: [v/s/r] "; continue ;;
      esac
    done
  fi
done 3< <(cmd)

exit 0

# vim: set ts=2 sw=2 noet: