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#!/bin/bash
#   pacdiff : a simple pacnew/pacorig/pacsave updater
#
#   Copyright (c) 2007 Aaron Griffin <aaronmgriffin@gmail.com>
#   Copyright (c) 2013-2014 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/>.
#

shopt -s extglob

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 USE_PACDB=0 OUTPUTONLY=0

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

usage() {
  cat <<EOF
${myname} (pacman) v${myver}

A simple program to merge or remove pacnew/pacorig/pacsave files.

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

Search Options:     select one (default: --pacmandb)
  -l/--locate       scan using locate
  -f/--find         scan using find
  -p/--pacmandb     scan active config files from pacman database

General Options:
  -o/--output       print files instead of merging them
  --nocolor         remove colors from output

Environment 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
Example: $myname --output --locate

EOF
}

version() {
  printf "%s %s\n" "$myname" "$myver"
  echo 'Copyright (C) 2007 Aaron Griffin <aaronmgriffin@gmail.com>'
  echo 'Copyright (C) 2013-2014 Pacman Development Team <pacman-dev@archlinux.org>'
}

print_existing() {
  [[ -f "$1" ]] && printf '%s\0' "$1"
}

print_existing_pacsave(){
  for f in "${1}"?(.+([0-9])); do
    [[ -f $f ]] && printf '%s\0' "$f"
  done
}

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
  elif (( USE_PACDB )); then
    awk '/^%BACKUP%$/ {
    while (getline) {
      if (/^$/) { nextfile }
        print $1
      }
    }' "${pac_db}"/*/files | while read -r bkup; do
      print_existing "/$bkup.pacnew"
      print_existing "/$bkup.pacorig"
      print_existing_pacsave "/$bkup.pacsave"
    done
  fi
}

while [[ -n "$1" ]]; do
  case "$1" in
    -l|--locate)
      USE_LOCATE=1;;
    -f|--find)
      USE_FIND=1;;
    -p|--pacmandb)
      USE_PACDB=1;;
    -o|--output)
      OUTPUTONLY=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)

if ! type -p $diffprog >/dev/null; then
  error "Cannot find the $diffprog binary required for viewing differences."
  exit 1
fi

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

if (( USE_PACDB )); then
  if [[ ! -r @sysconfdir@/pacman.conf ]]; then
    error "unable to read @sysconfdir@/pacman.conf"
    usage; exit 1
  fi

  eval $(awk '/DBPath/ {print $1$2$3}' @sysconfdir@/pacman.conf)
  pac_db="${DBPath:-@localstatedir@/lib/pacman/}local"
  if [[ ! -d "${pac_db}" ]]; then
    error "unable to read pacman database %s". "${pac_db}"
    usage; exit 1
  fi
fi

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

  if (( OUTPUTONLY )); then
    echo "$pacfile"
    continue
  fi

  # 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" "$file"
          ask "(V)iew, (S)kip, (R)emove %s, (O)verwrite with %s, (Q)uit: [v/s/r/o/q] " "$file_type" "$file_type";
          continue ;;
        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: