#! /bin/sh
# mkhistory - rebuild history file and friends
# Note, most sorts will accept "-T dir" to say where to put temporary files;
# this can be gotten in by setting the SORTTMP environment variable in the
# caller to "-T dir" and exporting it.  Some sorts might ask you to do it
# by setting TMPDIR instead.

# =()<. ${NEWSCONFIG-@<NEWSCONFIG>@}>()=
. ${NEWSCONFIG-/var/lib/news/bin/config}

PATH=$NEWSCTL/bin:$NEWSBIN/expire:$NEWSBIN:$NEWSPATH ; export PATH
umask $NEWSUMASK

sizemul=
case "$#$1" in
0)			;;
2-s)	sizemul="$2"	;;
*)	echo "Usage: $0 [-s sizemultiplier]" >&2
	exit 2
	;;
esac

lock="$NEWSCTL/LOCK"
ltemp="$NEWSCTL/L.$$"
echo $$ >$ltemp
trap "rm -f $ltemp ; exit 0" 0 1 2 15
while true
do
	if newslock $ltemp $lock
	then
		trap "rm -f $ltemp $lock ; exit 0" 0 1 2 15
		break
	fi
	sleep 30
done
if newslock $ltemp $NEWSCTL/LOCKexpire
then
	trap "rm -f $ltemp $lock $NEWSCTL/LOCKexpire ; exit 0" 0 1 2 15
else
	echo "$0: expire is running, $0 aborted" >&2
	exit 1
fi

cd $NEWSARTS
them=
for f in `ls | egrep -v '\.|(^lost\+found$)'`
do
	if test -d $f -a -r $f
	then
		them="$them $f"
	fi
done
find $them -type f -name '[0-9]*' -print | histinfo |
	sort $SORTTMP -t'	' +1n |
	awk -f $NEWSBIN/expire/histdups | histslash >$NEWSCTL/history.n

cd $NEWSCTL
if egrep '^<[^>]*@trash>	' history.n >/dev/null
then
	echo "$0: (warning) empty/trash articles found, will expire at once" >&2
	echo "$0:     (grep history file for '@trash' to see them)" >&2
fi
case "$sizemul" in
'')	dbzparm=		;;
*)	size="`wc -l <history.n`"
	awkpgm='{ printf "%ld\n", $1 * $2 }'
	# why not use expr?  because it's only 16 bits wide on 16-bit machines
	dbzparm="-p `echo $size $sizemul | awk \"$awkpgm\"`"
	;;
esac
dbz $dbzparm history.n

if test -f history
then
	mv history history.o
else
	true
fi && mv history.n history &&
rm -f history.pag history.dir &&
mv history.n.pag history.pag && mv history.n.dir history.dir