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#!/bin/bash
#
# paclog-pkglist - Parse a log file into a list of currently installed packages
#
# Copyright (C) 2011 Dave Reisner <dave@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='paclog-pkglist'
declare -r myver='@PACKAGE_VERSION@'

export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='/usr/share/locale'
declare logfile=${1:-@localstatedir@/log/pacman.log}

usage() {
  printf "%s (pacman) v%s\n" "${myname}" "${myver}"
  echo
  echo "Parse a log file into a list of currently installed packages"
  echo
  printf "Usage: %s [path to pacman log]\n" "${myname}"
  echo
  printf "Example: %s @localstatedir@/log/pacman.log\n" "${myname}"
  echo
  printf 'Defaults to: @localstatedir@/log/pacman.log'
}

version() {
  printf "%s %s\n" "$myname" "$myver"
  echo 'Copyright (C) 2011 Dave Reisner <dave@archlinux.org>'
}

if [[ $1 ]]; then
  if [[ $1 = -@(h|-help) ]]; then
    usage
    exit 0
  elif [[ $1 = -@(V|-version) ]]; then
    version
    exit 0
  elif [[ ! -e $logfile ]]; then
    printf $"target not found: %s\n" "$1"
    exit 1
  fi
fi

<"$logfile" awk '
{
  if ($3 ~ /^\[.*\]$/) {
    # new style with caller name
    action  = $4
    pkgname = $5
    pkgver  = $6
    upgver  = $8
    nfields = NF
  } else {
    action  = $3
    pkgname = $4
    pkgver  = $5
    upgver  = $7
    nfields = (NF + 1)    # compensate for missing caller field
  }
}

nfields == 6 && action == "installed" {
  gsub(/[()]/, "", pkgver)
  pkg[pkgname] = pkgver
  next
}

nfields == 8 && (action == "upgraded" || action == "downgraded") {
  sub(/\)/, "", upgver)
  pkg[pkgname] = upgver
  next
}

nfields == 6 && action == "removed" {
  pkg[pkgname] = -1
}

END {
  for (i in pkg) {
    if (pkg[i] != -1) {
      printf "%s %s\n",i,pkg[i]
    }
  }
}' | sort

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