#!/bin/sh
##################################################################
#
# Copyright (C) 2004 R Bos
#
# File:           $RCSfile: groupinstall-backend-suse,v $
# Revision:       $Revision: 1.7 $
# Last change:    $Date: 2004/08/18 19:07:42 $
#
# Send suggestions to: apt4rpm-devel@lists.sourceforge.net
# Homepage: http://apt4rpm.sourceforge.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
# 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.
#
# For a copy of the GNU General Public License, visit
# http://www.gnu.org or write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##################################################################

# This backend is to be used with apt.  The latter must be configured
# for the apt options: groupnames, showgroup, groupinstall and groupremove.
PATH=/bin:/usr/bin

PRGNAME=$(basename $0)

function get_summary
{
	FILE=$SEL_LOC/$1.sel
	if [ -r $FILE ]; then
		grep "^=Sum:" $SEL_LOC/$1.sel | cut -d: -f2 | sed 's,^ ,,'
	fi
}

function get_req
{
	FILE=$SEL_LOC/$1.sel
	if [ -r $FILE ]; then
		awk '{
			if ( $1 == "-Req:" ) prt = "no"
			if ( prt == "yes" ) print $1
			if ( $1 == "+Req:" ) prt = "yes"

		}' $FILE
	fi
}

function get_rec
{
	FILE=$SEL_LOC/$1.sel
	if [ -r $FILE ]; then
		awk '{
			if ( $1 == "-Rec:" ) prt = "no"
			if ( prt == "yes" ) print $1
			if ( $1 == "+Rec:" ) prt = "yes"

		}' $FILE
	fi
}

function get_req_and_rec
{
	local GRP

	for GRP in $@; do
		FILE=$SEL_LOC/$GRP.sel
		if [ -r $FILE ]; then
			awk '{
				if ( $1 == "-Req:" || $1 == "-Rec:" ) prt = "no"
				if ( prt == "yes" ) print $1
				if ( $1 == "+Req:" || $1 == "+Rec:" ) prt = "yes"

			}' $FILE
		fi
	done
}

function get_lang
{
	FILE=$SEL_LOC/$1.sel
	if [ -r $FILE ]; then
		grep "^+Ins." $FILE | sed s,+Ins.,, | cut -d: -f1
	fi
}

function get_pkgs
{
	local GRP

	for GRP in $@; do
		FILE=$SEL_LOC/$GRP.sel
		if [ -r $FILE ]; then
			awk '{
				if ( $1 == "-Ins:" ) prt = "no"
				if ( prt == "yes" ) print $1
				if ( $1 == "+Ins:" ) prt = "yes"

			}' $FILE
		fi
	done
}

function groupnames
{
	# Install location.  Selections that have been installed
	# are copied to this location.
	local INSTALL_LOC=/var/adm/YaST/SelDB

	if [[ "$OPT_SHOWHIDDEN" == "yes" ]]; then
		GRPS=$(ls $SEL_LOC/*sel)
	else
		GRPS=$(grep -l "=Vis: *true" $(grep -l "=Cat: *addon" $SEL_LOC/*sel))
	fi

	GRPS=$(echo "$GRPS" | sed 's,^.*/,,;s,\.sel$,,')

	if [[ "$OPT_TERM_MODE" == "yes" ]]; then
		printf "%-18s %s\n" "Group name"  "Description"
		printf "%-18s %s\n" "-----------" "------------"
	fi

	for GRP in $GRPS; do
		SUMMARY=$(get_summary $GRP)
		if [[ "$OPT_TERM_MODE" == "yes" ]]; then
			printf "%-18s %s\n" "$GRP" "$SUMMARY"
		else
			# IMODE = installation mode
			# i = installed, u = uninstalled
			if [[ -s $INSTALL_LOC/$GRP.sel ]]; then
				IMODE="i"
			else
				IMODE="u"
			fi

			printf "%s %s\t%s\n" "$IMODE" "$GRP" "$SUMMARY"
		fi
	done
}

function showgroup
{
	typeset -i NUM
	GRPS=$@

	local GRP
	typeset -i NUM

	NUM=1
	for GRP in $GRPS; do
		[ $NUM -gt 1 ] && echo
		echo "Group: $GRP"
		echo "Summary: $(get_summary $GRP)"
                LANGS="$(get_lang $GRP)"
		if [[ -n "$LANGS" ]]; then
			echo "Available languages:"
			echo "  " $LANGS
		fi
		REQ=$(get_req $GRP)
		if [[ -n "$REQ" ]]; then
			echo "Required groups:"
			echo "$REQ" | sed 's/^/  /'
		fi
		REC=$(get_rec $GRP)
		if [[ -n "$REC" ]]; then
			echo "Recommendend groups:"
			echo "$REC" | sed 's/^/  /'
		fi
		echo "Packages:" 
		get_pkgs $GRP | sed 's/^/  /'

		NUM=$((NUM + 1))
	done
}

function involved_groups
{
	ALL_GRPS="$@"
	REQUIRED_GRPS="$(get_req_and_rec $ALL_GRPS)"

	ALL_GRPS="$ALL_GRPS $REQUIRED_GRPS"

	# Use a recursive method to find all involved groups.
	# NUM is used to prevent a runaway loop.  Normally the most
	# extensive dependencies are resolved in 5 iterations.
	typeset -i NUM=1
	while [[ -n "$REQUIRED_GRPS" && $NUM -lt 7 ]]; do

		unset LOOP_REQS
		for GRP in $REQUIRED_GRPS; do
			if [[ -z "$LOOP_REQS" ]]; then
				LOOP_REQS="$(get_req_and_rec $GRP)"
			else
				LOOP_REQS="$LOOP_REQS $(get_req_and_rec $GRP)"
			fi
		done

		ALL_GRPS="$ALL_GRPS $LOOP_REQS"
		REQUIRED_GRPS="$LOOP_REQS"

		NUM=$(($NUM + 1))
	done

	echo $ALL_GRPS | tr " " "\n" | sort -u
}

OPT_TERM_MODE=no

while [[ $# -gt 0 ]]; do

	case $1 in
	-h)
		OPT_SHOWHIDDEN=yes
		;;
	--list-tasks)
		cmd=groupnames 
		;;
	--task-desc)
		cmd=showgroup
		OPT_GRPS="$OPT_GRPS $2"
		shift
		;;
	--task-packages)
		cmd=grouppkgs
		OPT_GRPS="$OPT_GRPS $2"
		shift
		;;
	-t)
		OPT_TERM_MODE=yes
		;;
	-r|-a|-p)
		echo "Not supported argument: $1" >&2
		;;
	*)
		echo "Incorrect argument: $1" >&2
		exit 1
		;;
	esac

	shift
done

# Find the first populated selection directory
# Some more information about the *.sel files directory can be found in 
# the suse package: yast2-packagemanager.
# The file is src/inst/InstSrcManager.cc
for DIR in $(ls -d /var/adm/YaST/InstSrcManager/IS_CACHE_0x000000??); do
	if ls -l $DIR/DATA/descr/*.sel >/dev/null 2>&1; then
		SEL_LOC=$DIR/DATA/descr
		break
	fi
done

if [[ -z "$SEL_LOC" ]]; then
	echo "$PRGNAME: no selection files found" >&2
	exit 2
fi

case $cmd in

	groupnames)
		groupnames
		;;

	showgroup)
		showgroup $OPT_GRPS
		;;

	grouppkgs)
		get_pkgs $(involved_groups $OPT_GRPS)
		;;
esac