#! /bin/sh
# Prepare up to $4 batches of size $2-$3 in files named togo.[0-9] ,
# working from $1.  Note that $4 can be 0, a special case.
#
# If the togo files do not contain file sizes, we make an arbitrary guess
# at an average size.

# =()<. ${NEWSCONFIG-@<NEWSCONFIG>@}>()=
. ${NEWSCONFIG-/usr/local/libexec/cnews/config}

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

input="$1"
maxbatch="$2"
absmax="$3"
nwanted="$4"

rm -f togo.overflow togo.count
awk 'BEGIN {
	batchsize = 0
	bno = 1
	ndone = 0
	batch = "togo." bno
	nwanted = '$nwanted'
	maxbatch = '$maxbatch'
	absmax = '$absmax'
	origmax = maxbatch
	minbatch = 1
	if (nwanted == 0) {		# a bit of a kludge
		minbatch = 0
		maxbatch = 0
		ndone = -1
	}
}
{
	if ($NF ~ /^<.*>$/)			# ihave/sendme or NNTP
		size = length($0) + 1
	else if (NF == 1 || $NF !~ /^[0-9]+$/)	# no size present
		size = 3000			# Arbitrary guess.
	else
		size = $NF + 15			# 15 for "#! rnews nnnnn"
	if (size > absmax) {
		print "article", $1, ">" absmax "bytes, not sent to \"'"$NEWSSITE"'\""
		next			# NOTE NEXT
	}

	if (batchsize + size > maxbatch && batchsize >= minbatch) {
		# Go to next batch.
		ndone++
		if (ndone < nwanted) {
			bno++
			batch = "togo." bno
		} else if (ndone == nwanted && FILENAME == "togo.more") {
			batch = "togo.next"
			nnext = 4 * nwanted	# how many batches in togo.next
			if (nnext < 20)		# at least 20
				nnext = 20
			maxbatch = origmax * nnext
			minbatch = 1
		} else {
			print NR - 1 >"togo.count"
			exit		# punt to sed to rebuild togo.more
		}
		batchsize = 0
	}
	batchsize += size
	print >batch
}' $input

# handle the overflow case efficiently
if test -s togo.count
then
	sed "1,`cat togo.count`d" $input >togo.overflow
	rm togo.count
	mv togo.overflow $input
else
	rm $input
fi