#!/bin/bash
#   pacscripts : tries to print out the {pre,post}_{install,remove,upgrade} scripts of a given package
#
#   Copyright (c) 2009 Giulio "giulivo" Fidente <giulivo.navigante@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/>.
#

prog_ver="0.2"

if [ ! -r /etc/pacman.conf ]; then
	echo "ERROR: unable to read /etc/pacman.conf"
	exit 1
else
	eval $(awk '/DBPath/ {print $1$2$3}' /etc/pacman.conf)
	eval $(awk '/CacheDir/ {print $1$2$3}' /etc/pacman.conf)
fi

pac_db="${DBPath:-/var/lib/pacman}/local"
pac_cache="${CacheDir:-/var/cache/pacman/pkg}"

usage() {
	echo "This program prints out the {pre,post}_{install,remove,upgrade} scripts"
	echo "of a given package, even if it's not installed yet, without installing it!"
	echo "Usage: `basename $0` package..."
	echo
	echo " OPTIONS:"
	echo "  -h, --help                 Print this help message"
	echo "  -v, --version              Print program name and version"
	echo
	echo "Example: `basename $0` gconf-editor"
}

print_scriptlet() {
	(cat $pac_db/$1-*/install 2> /dev/null) || (pacman -Sw --nodeps --noconfirm $1 > /dev/null && (tar -xOf $pac_cache/$1*.pkg.tar.gz .INSTALL 2> /dev/null || echo "Package did not include any .INSTALL script"))
}

if [ $# -ne 1 ] ; then
    usage
    exit 1
fi

if [ "$1" = "--help" -o "$1" = "-h" ] ; then
    usage
    exit 0
elif [ "$1" = "--version" -o "$1" = "-v" ] ; then
    echo "`basename $0` version $prog_ver"
    exit 0
else
    print_scriptlet $1
fi