#!/bin/rc

while()
{
div=--------------------------------------
echo
echo $div
echo

# must be topologically sorted (by prereq)
tasks=(pickdisk partdisk prepdisk reamfs mountfs \
	configarch startether startppp download stopppp \
	unpack bootsetup finish stop stopether)

pseudotasks=(configip havefiles etherup etherdown pppup pppdown)

for(i in $tasks $pseudotasks)
	$i=notdone

coherence

for(i in $tasks $pseudotasks)
	if(~ $#$i 0)
		$i=notdone

#
# for the most part we believe the environment
# about whether something is done, but it 
# must be consistent with the prerequisites
# and we let the module confirm as well.
#

done=()
ready=()
rm /env/done
rm /env/ready
for(i in $tasks) {
	if(~ $$i done) {
		for(j in `{prereq $i})
			if(! ~ $$j done)
				$i=notdone
		if(~ $$i done) {
			export $i
			$i checkdone
			$i=`{grep '^'$i^'=' /tmp/vars | sed -n '$p' | sed 's/.*=//'}
		}
	}

	if(~ $$i notdone ready) {
		okay=yes
		for(j in `{prereq $i}) 
			if(! ~ $$j done)
				okay=no
		switch($okay){
		case yes
			$i=ready
			export $i
			$i checkready
			$i=`{grep '^'$i^'=' /tmp/vars | sed -n '$p' | sed 's/.*=//'}
		case no
			$i=notdone
		}
	}

	if(~ $$i done ready)
		$$i=($$$i $i)		# rc can be just as complicated as perl!
}

export $tasks $pseudotasks done ready
coherence

if(! ~ $#done 0) {
	echo 'The following tasks are done: '
	for(i in $done)
		desc $i
	echo
}

echo 'The following unfinished tasks are ready to be done:'
for(i in $ready)
	desc $i
echo

if(~ $#ready 0) {
	echo hey you finished everything!  not supposed to happen.
	sleep 100
	exit
}

prompt -d $ready(1) -w '' 'Task to do' $done $ready

echo
echo $div

$rd go
$rd=done		# if it's not, the check will figure that out
export $rd
}