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#!/bin/bash
#   pacdiff : a simple pacnew/pacorig/pacsave updater
#
#   Copyright (c) 2007 Aaron Griffin <aaronmgriffin@gmail.com>
#   Copyright (c) 2013 Pacman Development Team <pacman-dev@archlinux.org>
#
#   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'
declare -r myver='@PACKAGE_VERSION@'

diffprog=${DIFFPROG:-vimdiff}
diffsearchpath=${DIFFSEARCHPATH:-/etc}
USE_COLOR='y'
declare -a oldsaves
declare -i USE_FIND=0 USE_LOCATE=0

m4_include(../scripts/library/output_format.sh)

usage() {
  cat <<EOF
$myname is a simple pacnew/pacorig/pacsave updater.

Usage: $myname [-l | -f] [--nocolor]

Search Options:     select one, default: find
  -l/--locate       scan using locate
  -f/--find         scan using find

General Options:
  --nocolor         remove colors from output

Enviroment Variables:
  DIFFPROG          override the merge program: (default: vimdiff)
  DIFFSEARCHPATH    override the search path. (only when using find)
                    (default: /etc)

Example: DIFFPROG=meld DIFFSEARCHPATH="/boot /etc /usr" $myname

EOF
}

version() {
  printf "%s %s\n" "$myname" "$myver"
  echo 'Copyright (C) 2007 Aaron Griffin <aaronmgriffin@gmail.com>'
  echo 'Copyright (C) 2013 Pacman Development Team <pacman-dev@archlinux.org>'
}

cmd() {
  if (( USE_LOCATE )); then
    locate -0 -e -b \*.pacnew \*.pacorig \*.pacsave '*.pacsave.[0-9]*'
  elif (( USE_FIND )); then
    find $diffsearchpath \( -name \*.pacnew -o -name \*.pacorig -o -name \*.pacsave -o -name '*.pacsave.[0-9]*' \) -print0
  fi
}

while [[ -n "$1" ]]; do 
  case "$1" in
    -l|--locate)
      USE_LOCATE=1;;
    -f|--find)
      USE_FIND=1;;
    --nocolor)
      USE_COLOR='n' ;;
    -V|--version)
      version; exit 0;;
    -h|--help)
      usage; exit 0;;
    *)
      usage; exit 1;;
  esac
  shift
done

m4_include(../scripts/library/term_colors.sh)

case $(( USE_FIND + USE_LOCATE )) in
  0) USE_FIND=1;; # set the default search option
  [^1]) error "Only one search option may be used at a time"
    usage; exit 1;;
esac

# see http://mywiki.wooledge.org/BashFAQ/020
while IFS= read -u 3 -r -d '' pacfile; do
  file="${pacfile%.pac*}"
  file_type="pac${pacfile##*.pac}"

  # add matches for pacsave.N to oldsaves array, do not prompt
  if [[ $file_type = pacsave.+([0-9]) ]]; then
    oldsaves+=("$pacfile")
    continue
  fi

  msg "%s file found for %s" "$file_type" "$file"
  if [ ! -f "$file" ]; then
    warning "$file does not exist"
    rm -iv "$pacfile"
    continue
  fi

  if cmp -s "$pacfile" "$file"; then
    msg2 "Files are identical, removing..."
    rm -v "$pacfile"
  else
    ask "(V)iew, (S)kip, (R)emove %s, (O)verwrite with %s, (Q)uit: [v/s/r/o/q] " "$file_type" "$file_type"
    while read c; do
      case $c in
        q|Q) exit 0;;
        r|R) rm -v "$pacfile"; break ;;
        o|O) mv -v "$pacfile" "$file"; break ;;
        v|V)
        $diffprog "$pacfile" "$file"
        rm -iv "$pacfile"; break ;;
        s|S) break ;;
        *) ask "Invalid answer. Try again: [v/s/r/o/q] "; continue ;;
      esac
    done
  fi
done 3< <(cmd)

(( ${#oldsaves[@]} )) && warning "Ignoring %s" "${oldsaves[@]}"

exit 0

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