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#!/bin/bash

# Copyright (C) 2012 George Danchev <danchev@spnet.net>

# 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, 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

SELF=$(basename "$0")
VER=0.3

OPT_CHECK_INSTALLED_PACKAGES=0
OPT_SHOW_INSTALLED_ENHANCEMENTS=0
OPT_VERBOSE=0

print_version() {
echo "$VER"
}

print_help() {
cat << HLP
${SELF} ( -ip | -ie | -h | --verbose | --version )

Options:

 Program options start with dash or double dash, otherwise they
 are interpreted as package names. Only non-installed enhancement
 packages are printed out by default, use -ie to show them all.

 -ip, --ip, -installed-packages, --installed-packages
     Show enhancements of all installed packages (could be slow)
 -ie, --ie, -installed-enhancements, --installed-enhancements
     Show installed enhancement packages too
 -h, -help, --help
 -version, --version
 -verbose, --verbose

Examples:

# check enhancement packages of all installed packages
 ${SELF} -ip
# check enhancement packages of selected packages
 ${SELF} pkg1 pkgN

HLP
}

pkgs_enhancing_pkg_status() {
    # Figure out which package list files are there
    PACKAGEFILES=$(apt-get indextargets --format '$(FILENAME)' "Created-By: Packages")
    # Figure out package Enhances:'ing a given package
    EN=$(/usr/lib/apt/apt-helper cat-file $PACKAGEFILES | grep-dctrl -n -s Package -F Enhances -X "${1}")
    case $? in
       0) if test $OPT_VERBOSE != 0; then echo -e "Package <<$1>> could be Enhanced by:"; fi
       ;;
       1) return
       ;;
       *) echo "${SELF}: Internal Error!"
          exit 1
       ;;
    esac
    for e in `echo "${EN}" | sort | uniq | xargs` # now sort and unify
    do
          # Figure out whether those enhancements are installed or not.
	  # By default only output non-installed enhancements
	  OUT=""
	  case "${OPT_SHOW_INSTALLED_ENHANCEMENTS}" in
	       0) OUT=`apt-cache policy ${e} | head -3 | paste -s | grep "Installed: (none)"`
	       ;;
	       1) OUT=`apt-cache policy ${e} | head -3 | paste -s`
	       ;;
	  esac
          if test x"$OUT" != x""; then printf "%2s => " "$1" && echo "${OUT}"; fi
    done
}

# main
declare -a PKGS=()
for op in $@
do
  case "${op}" in
    -ip|--ip|-installed-packages|--installed-packages)
      OPT_CHECK_INSTALLED_PACKAGES=1
    ;;

    -ie|--ie|-installed-enhancements|--installed-enhancements)
      OPT_SHOW_INSTALLED_ENHANCEMENTS=1
    ;;

    -h|-help|--help)
      print_help
      exit 0
    ;;

    -version|--version)
      print_version
      exit 0
    ;;

    -verbose|--verbose)
      OPT_VERBOSE=1
    ;;

    -*)
      echo "invalid option ${op}"
      print_help
      exit 1
    ;;

    *)
#      PKGS[$[${#PKGS[@]}+1]]="${op}"
      PKGS+=(${op})
    ;;
  esac
done

# no options, just show help
if test x"$1" == x""; then print_help; exit 0; fi

# process package names given on the cmdline
for cmdline_pkg in "${PKGS[@]}"
do
    pkgs_enhancing_pkg_status $cmdline_pkg
done

# process installed packages, as well
case $OPT_CHECK_INSTALLED_PACKAGES in
    1)
    for installed in $(grep-status -FStatus "install ok installed" -n -s Package | sort | uniq)
    do
       pkgs_enhancing_pkg_status $installed
    done
    ;;
esac

exit 0