#!/bin/bash

_SYSCONFDIR=${sysconfdir:-/etc}

_PREFIX=${prefix:-/usr}

_DATADIR=${datadir:-${_PREFIX}/share}

ADDIR=${ADDIR:-${install_prefix}${_SYSCONFDIR}/xscreensaver}

CONFDIR=${CONFDIR:-${install_prefix}${_DATADIR}/xscreensaver/hacks.conf.d}

ADFILE=${ADFILE:-$ADDIR/XScreenSaver.ad}

fix_hackconf ()

{

	if [ ! -s $1 ] ; then

		echo "$1 is empty" >&2

		echo ""

		return 1

	fi

	tmpconf=`mktemp /tmp/hackconf.XXXXXXXX`

	tmpconf_1=`mktemp /tmp/hackconf.XXXXXXXX`

	tmpconf_2=`mktemp /tmp/hackconf.XXXXXXXX`

	tmpconf_3=`mktemp /tmp/hackconf.XXXXXXXX`

	sed -n -e '$p' $1 > $tmpconf_1

	sed -e '$d' $1 > $tmpconf_2

	for file in $tmpconf_1 $tmpconf_2 ; do

		if ( [ -s $file ] && grep -q '\\n\(\|\\\)[^\\].*$' $file ) ; then

			rm -f $tmpconf $tmpconf_1 $tmpconf_2 $tmpconf_3

			echo ""

			echo "ignoring $1" >&2

			return 1

		fi

	done

	if ! grep -q '\\n[\\]*$' $tmpconf_1 ; then

		sed -i -e 's|\(^.*$\)|\1 \\n\\|' $tmpconf_1

	fi

	sed -i -e 's|\\n$|\\n\\|' $tmpconf_1

	while [ -s $tmpconf_2 ] ; do

		sed -n -e '1p' $tmpconf_2 > $tmpconf_3

		sed -i -e '1d' $tmpconf_2

		if ! grep -q '\([ \t]\\$\|\\n\\$\)' $tmpconf_3 ; then

			rm -f $tmpconf $tmpconf_1 $tmpconf_2 $tmpconf_3

			echo ""

			echo "ignoring $1" >&2

			return 1

		fi

		cat $tmpconf_3 >> $tmpconf

	done

	cat $tmpconf_1 >> $tmpconf

	rm -f $tmpconf_1 $tmpconf_2 $tmpconf_3

	echo $tmpconf

	return 0

}

for suffix in header tail ; do

	if [ ! -r $ADDIR/XScreenSaver.ad.$suffix ] ; then

		echo "$ADDIR/XScreenSaver.ad.$suffix missing"

		exit 1

	fi

done

tmpfile=`mktemp /tmp/XScreenSaver.ad.XXXXXXXX`

cat > $tmpfile <

! Don't edit this file directly by yourself!!

! This file is not meant to be edited directly.

!

! Instread, please edit /etc/xscreensaver/XScreenSaver.ad.header,

! /etc/xscreensaver/XScreenSaver.ad.tail and add files under

! /usr/share/xscreensaver/hacks.conf.d if you want.

!

! Then call /usr/sbin/update-xscreensaver-hacks to 

! update this file.

!

EOF

cat $ADDIR/XScreenSaver.ad.header >> $tmpfile

for hackconf in $CONFDIR/*.conf ; do

	hackconf_fixed=`fix_hackconf $hackconf`

	if [ -n "$hackconf_fixed" ] ; then

		cat $hackconf_fixed >> $tmpfile

		rm -f $hackconf_fixed

	fi

done

sed -i -e '$s|\\n\\$|\\n|' $tmpfile

cat $ADDIR/XScreenSaver.ad.tail >> $tmpfile

install -c -p -m 644 $tmpfile $ADFILE

rm -f $tmpfile